DEBT AND FINANCING ARRANGEMENTS - Carrying Value of Outstanding Debt (Detail) - USD ($)
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Apr. 01, 2020 |
Sep. 30, 2021 |
Apr. 01, 2021 |
Jan. 15, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 22,274,000,000
|
|
|
|
|
| Total debt |
|
22,106,000,000
|
|
|
$ 24,654,000,000
|
|
| Less current maturities |
|
(1,268,000,000)
|
|
|
(2,623,000,000)
|
|
| Long-Term Debt and Finance Leases |
|
20,838,000,000
|
|
|
22,031,000,000
|
|
| Senior notes | 3.125% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 0
|
|
|
|
|
| Debt instrument, stated interest rate |
|
3.125%
|
|
3.125%
|
|
|
| Total debt |
|
$ 0
|
|
|
1,507,000,000
|
|
| Senior notes | 2.050% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 0
|
|
|
|
|
| Debt instrument, stated interest rate |
|
2.05%
|
2.05%
|
|
|
|
| Total debt |
|
$ 0
|
|
|
700,000,000
|
|
| Senior notes | 2.450% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 1,000,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
2.45%
|
|
|
|
|
| Total debt |
|
$ 1,016,000,000
|
|
|
1,028,000,000
|
|
| Senior notes | 2.350% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 600,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
2.35%
|
|
|
|
|
| Total debt |
|
$ 600,000,000
|
|
|
599,000,000
|
|
| Senior notes | 2.500% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 1,000,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
2.50%
|
|
|
|
|
| Total debt |
|
$ 998,000,000
|
|
|
997,000,000
|
|
| Senior notes | 2.800% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 500,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
2.80%
|
|
|
|
|
| Total debt |
|
$ 498,000,000
|
|
|
498,000,000
|
|
| Senior notes | 2.200% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 400,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
2.20%
|
|
|
|
|
| Total debt |
|
$ 399,000,000
|
|
|
398,000,000
|
|
| Senior notes | 3.900% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 1,000,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
3.90%
|
|
|
|
|
| Total debt |
|
$ 996,000,000
|
|
|
995,000,000
|
|
| Senior notes | 2.400% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 500,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
2.40%
|
|
|
|
|
| Total debt |
|
$ 498,000,000
|
|
|
498,000,000
|
|
| Senior notes | 3.050% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 1,000,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
3.05%
|
|
|
|
|
| Total debt |
|
$ 994,000,000
|
|
|
993,000,000
|
|
| Senior notes | 3.400% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 750,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
3.40%
|
|
|
|
|
| Total debt |
|
$ 746,000,000
|
|
|
746,000,000
|
|
| Senior notes | 2.500% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 400,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
2.50%
|
|
|
|
|
| Total debt |
|
$ 397,000,000
|
|
|
397,000,000
|
|
| Senior notes | 4.450% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 750,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
4.45%
|
|
|
|
|
| Total debt |
|
$ 743,000,000
|
|
|
743,000,000
|
|
| Senior notes | 6.200% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 1,500,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
6.20%
|
|
|
|
|
| Total debt |
|
$ 1,484,000,000
|
|
|
1,483,000,000
|
|
| Senior notes | 5.200% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 500,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
5.20%
|
|
|
|
|
| Total debt |
|
$ 494,000,000
|
|
|
493,000,000
|
|
| Senior notes | 4.875% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 500,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
4.875%
|
|
|
|
|
| Total debt |
|
$ 491,000,000
|
|
|
490,000,000
|
|
| Senior notes | 3.625% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 375,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
3.625%
|
|
|
|
|
| Total debt |
|
$ 368,000,000
|
|
|
368,000,000
|
|
| Senior notes | 3.400% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 500,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
3.40%
|
|
|
|
|
| Total debt |
|
$ 492,000,000
|
|
|
491,000,000
|
|
| Senior notes | 3.750% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 1,150,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
3.75%
|
|
|
|
|
| Total debt |
|
$ 1,137,000,000
|
|
|
1,137,000,000
|
|
| Senior notes | 4.250% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 750,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
4.25%
|
|
|
|
|
| Total debt |
|
$ 743,000,000
|
|
|
742,000,000
|
|
| Senior notes | 3.400% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 700,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
3.40%
|
|
|
|
|
| Total debt |
|
$ 688,000,000
|
|
|
688,000,000
|
|
| Senior notes | 5.300% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 1,250,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
5.30%
|
|
|
|
|
| Total debt |
|
$ 1,231,000,000
|
|
|
1,231,000,000
|
|
| Senior notes | Floating-rate senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
0
|
|
|
|
|
| Total debt |
|
0
|
|
|
350,000,000
|
|
| Senior notes | Floating-rate senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
400,000,000
|
|
|
|
|
| Total debt |
|
400,000,000
|
|
|
399,000,000
|
|
| Senior notes | Floating-rate senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
500,000,000
|
|
|
|
|
| Total debt |
|
500,000,000
|
|
|
499,000,000
|
|
| Senior notes | Floating-rate senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
1,039,000,000
|
|
|
|
|
| Total debt |
|
1,027,000,000
|
|
|
1,027,000,000
|
|
| Senior notes | 7.620% debentures(1) |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 276,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
7.62%
|
7.62%
|
|
|
|
8.375%
|
| Total debt |
|
$ 280,000,000
|
|
|
281,000,000
|
|
| Debt instrument, term |
10 years
|
|
|
|
|
|
| Senior notes | Canadian senior note 2.125% |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 588,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
2.125%
|
|
|
|
|
| Total debt |
|
$ 586,000,000
|
|
|
583,000,000
|
|
| Pound Sterling notes | 5.500% notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 89,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
5.50%
|
|
|
|
|
| Total debt |
|
$ 88,000,000
|
|
|
90,000,000
|
|
| Pound Sterling notes | 5.125% notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 612,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
5.125%
|
|
|
|
|
| Total debt |
|
$ 581,000,000
|
|
|
586,000,000
|
|
| Euro Senior Notes | 0.375% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 811,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
0.375%
|
|
|
|
|
| Total debt |
|
$ 808,000,000
|
|
|
857,000,000
|
|
| Euro Senior Notes | 1.625% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 811,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
1.625%
|
|
|
|
|
| Total debt |
|
$ 807,000,000
|
|
|
856,000,000
|
|
| Euro Senior Notes | 1.000% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 579,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
1.00%
|
|
|
|
|
| Total debt |
|
$ 576,000,000
|
|
|
611,000,000
|
|
| Euro Senior Notes | 1.500% senior notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 579,000,000
|
|
|
|
|
| Debt instrument, stated interest rate |
|
1.50%
|
|
|
|
|
| Total debt |
|
$ 575,000,000
|
|
|
611,000,000
|
|
| Facility notes and bonds |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
320,000,000
|
|
|
|
|
| Total debt |
|
320,000,000
|
|
|
320,000,000
|
|
| Other debt |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt Instrument, Face Amount |
|
3,000,000
|
|
|
|
|
| Total debt |
|
$ 3,000,000
|
|
|
$ 5,000,000
|
|