Carrying Value of Outstanding Debt (Detail)
CAD in Millions |
9 Months Ended |
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Sep. 30, 2017
USD ($)
|
May 15, 2017
USD ($)
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May 15, 2017
CAD
|
May 11, 2017
USD ($)
|
Dec. 31, 2016
USD ($)
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
$ 18,897,000,000
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| Debt instrument, stated interest rate |
8.375%
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| Total debt |
$ 18,910,000,000
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|
$ 16,075,000,000
|
| Less current maturities |
(4,555,000,000)
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(3,681,000,000)
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| Long-Term Debt |
14,355,000,000
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12,394,000,000
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| Commercial Paper |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
$ 4,120,000,000
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| Maturity - Minimum Date |
Mar. 31, 2017
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| Maturity - Maximum Date |
Dec. 31, 2018
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| Total debt |
$ 4,120,000,000
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|
3,250,000,000
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| Senior notes | 1.125% senior notes |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
$ 375,000,000
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| Maturity - Maximum Date |
Dec. 31, 2017
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| Debt instrument, stated interest rate |
1.125%
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| Total debt |
$ 375,000,000
|
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|
374,000,000
|
| Senior notes | 5.50% stated rate |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
$ 750,000,000
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| Maturity - Maximum Date |
Dec. 31, 2018
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| Debt instrument, stated interest rate |
5.50%
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| Total debt |
$ 755,000,000
|
|
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|
769,000,000
|
| Senior notes | 5.125% stated rate |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
$ 1,000,000,000
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| Maturity - Maximum Date |
Dec. 31, 2019
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| Debt instrument, stated interest rate |
5.125%
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| Total debt |
$ 1,027,000,000
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|
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|
1,043,000,000
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| Senior notes | 3.125% stated rate |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
$ 1,500,000,000
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| Maturity - Maximum Date |
Dec. 31, 2021
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| Debt instrument, stated interest rate |
3.125%
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| Total debt |
$ 1,567,000,000
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|
1,584,000,000
|
| Senior notes | 2.40% senior notes |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
$ 500,000,000
|
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| Maturity - Maximum Date |
Dec. 31, 2026
|
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| Debt instrument, stated interest rate |
2.40%
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| Total debt |
$ 497,000,000
|
|
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|
497,000,000
|
| Senior notes | 2.45% senior notes |
|
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
$ 1,000,000,000
|
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| Maturity - Maximum Date |
Dec. 31, 2022
|
|
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| Debt instrument, stated interest rate |
2.45%
|
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| Total debt |
$ 989,000,000
|
|
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|
986,000,000
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| Senior notes | 2.35% senior notes |
|
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
$ 600,000,000
|
|
|
$ 600,000,000
|
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| Maturity - Maximum Date |
Dec. 31, 2022
|
|
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| Debt instrument, stated interest rate |
2.35%
|
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|
2.35%
|
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| Total debt |
$ 596,000,000
|
|
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|
0
|
| Senior notes | 6.20% stated rate |
|
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| Debt Instrument [Line Items] |
|
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| Debt Instrument, Face Amount |
$ 1,500,000,000
|
|
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| Maturity - Maximum Date |
Dec. 31, 2038
|
|
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| Debt instrument, stated interest rate |
6.20%
|
|
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| Total debt |
$ 1,482,000,000
|
|
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|
1,481,000,000
|
| Senior notes | 4.875% stated rate |
|
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
$ 500,000,000
|
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| Maturity - Maximum Date |
Dec. 31, 2040
|
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| Debt instrument, stated interest rate |
4.875%
|
|
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| Total debt |
$ 489,000,000
|
|
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|
489,000,000
|
| Senior notes | 3.625% senior notes |
|
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| Debt Instrument [Line Items] |
|
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| Debt Instrument, Face Amount |
$ 375,000,000
|
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| Maturity - Maximum Date |
Dec. 31, 2042
|
|
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| Debt instrument, stated interest rate |
3.625%
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| Total debt |
$ 368,000,000
|
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|
367,000,000
|
| Senior notes | 3.40% senior notes |
|
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
$ 500,000,000
|
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| Maturity - Maximum Date |
Dec. 31, 2046
|
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| Debt instrument, stated interest rate |
3.40%
|
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| Total debt |
$ 491,000,000
|
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|
491,000,000
|
| Senior notes | Floating rate senior notes |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
$ 400,000,000
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|
$ 400,000,000
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| Maturity - Maximum Date |
Dec. 31, 2022
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|
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| Total debt |
$ 398,000,000
|
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|
0
|
| Senior notes | 8.375% debentures |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
$ 424,000,000
|
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| Maturity - Maximum Date |
Dec. 31, 2029
|
|
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| Debt instrument, stated interest rate |
8.375%
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|
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| Total debt |
$ 453,000,000
|
|
|
|
461,000,000
|
| Senior notes | 8.375% debentures |
|
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| Debt Instrument [Line Items] |
|
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| Debt Instrument, Face Amount |
$ 276,000,000
|
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| Maturity - Maximum Date |
Dec. 31, 2030
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|
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| Total debt |
$ 282,000,000
|
|
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|
282,000,000
|
| Senior notes | Canadian senior note 2.125% |
|
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
$ 603,000,000
|
$ 547,000,000
|
CAD 750
|
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| Maturity - Maximum Date |
Dec. 31, 2024
|
|
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| Debt instrument, stated interest rate |
2.125%
|
2.125%
|
2.125%
|
|
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| Total debt |
$ 600,000,000
|
|
|
|
0
|
| Senior notes | Floating rate senior notes |
|
|
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| Debt Instrument [Line Items] |
|
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| Debt Instrument, Face Amount |
$ 979,000,000
|
|
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| Maturity - Minimum Date |
Dec. 31, 2049
|
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| Maturity - Maximum Date |
Dec. 31, 2067
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| Total debt |
$ 969,000,000
|
|
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|
824,000,000
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| Capital Lease Obligations |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
$ 450,000,000
|
|
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| Maturity - Minimum Date |
Dec. 31, 2017
|
|
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| Maturity - Maximum Date |
Dec. 31, 3005
|
|
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| Total debt |
$ 450,000,000
|
|
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|
447,000,000
|
| Pound Sterling notes | 5.50% notes |
|
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| Debt Instrument [Line Items] |
|
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| Debt Instrument, Face Amount |
$ 89,000,000
|
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| Maturity - Maximum Date |
Dec. 31, 2031
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|
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| Debt instrument, stated interest rate |
5.50%
|
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| Total debt |
$ 84,000,000
|
|
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|
76,000,000
|
| Pound Sterling notes | 5.125% notes |
|
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| Debt Instrument [Line Items] |
|
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| Debt Instrument, Face Amount |
$ 609,000,000
|
|
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| Maturity - Maximum Date |
Jan. 01, 2022
|
|
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| Debt instrument, stated interest rate |
5.125%
|
|
|
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| Total debt |
$ 582,000,000
|
|
|
|
535,000,000
|
| Euro Senior Notes | 1.625% Euro Senior Notes |
|
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| Debt Instrument [Line Items] |
|
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| Debt Instrument, Face Amount |
$ 827,000,000
|
|
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| Debt instrument, stated interest rate |
1.625%
|
|
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| Total debt |
$ 822,000,000
|
|
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|
732,000,000
|
| Euro Senior Notes | 1.00% notes |
|
|
|
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| Debt Instrument [Line Items] |
|
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| Debt Instrument, Face Amount |
$ 591,000,000
|
|
|
|
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| Debt instrument, stated interest rate |
1.00%
|
|
|
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| Total debt |
$ 587,000,000
|
|
|
|
523,000,000
|
| Euro Senior Notes | Floating rate senior notes |
|
|
|
|
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| Debt Instrument [Line Items] |
|
|
|
|
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| Debt Instrument, Face Amount |
591,000,000
|
|
|
|
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| Total debt |
589,000,000
|
|
|
|
525,000,000
|
| Facility notes and bonds |
|
|
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| Debt Instrument [Line Items] |
|
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| Debt Instrument, Face Amount |
$ 320,000,000
|
|
|
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| Maturity - Minimum Date |
Dec. 31, 2029
|
|
|
|
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| Maturity - Maximum Date |
Dec. 31, 2045
|
|
|
|
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| Total debt |
$ 320,000,000
|
|
|
|
319,000,000
|
| Other debt |
|
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| Debt Instrument [Line Items] |
|
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| Debt Instrument, Face Amount |
$ 18,000,000
|
|
|
|
|
| Maturity - Minimum Date |
Dec. 31, 2017
|
|
|
|
|
| Maturity - Maximum Date |
Dec. 31, 2022
|
|
|
|
|
| Total debt |
$ 18,000,000
|
|
|
|
$ 20,000,000
|