Carrying Value of Outstanding Debt (Detail) (USD $)
In Millions, unless otherwise specified |
9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | |||||||||||||||||||||||||||||
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Sep. 30, 2013
|
Dec. 31, 2012
|
Jan. 15, 2013
4.50% stated rate
|
Sep. 30, 2013
3.875% stated rate
|
Sep. 30, 2013
Commercial Paper
|
Dec. 31, 2012
Commercial Paper
|
Sep. 30, 2013
Senior notes
4.50% stated rate
|
Dec. 31, 2012
Senior notes
4.50% stated rate
|
Sep. 30, 2013
Senior notes
3.875% stated rate
|
Dec. 31, 2012
Senior notes
3.875% stated rate
|
Sep. 30, 2013
Senior notes
5.50% stated rate
|
Dec. 31, 2012
Senior notes
5.50% stated rate
|
Sep. 30, 2013
Senior notes
5.125% stated rate
|
Dec. 31, 2012
Senior notes
5.125% stated rate
|
Sep. 30, 2013
Senior notes
Debentures 8 Point 375 Percent Due 2030 [Member]
|
Dec. 31, 2012
Senior notes
Debentures 8 Point 375 Percent Due 2030 [Member]
|
Sep. 30, 2013
Senior notes
3.125% stated rate
|
Dec. 31, 2012
Senior notes
3.125% stated rate
|
Sep. 30, 2013
Senior notes
6.20% stated rate
|
Dec. 31, 2012
Senior notes
6.20% stated rate
|
Sep. 30, 2013
Senior notes
4.875% stated rate
|
Dec. 31, 2012
Senior notes
4.875% stated rate
|
Sep. 30, 2013
Senior notes
A1125SeniorNotes [Member]
|
Dec. 31, 2012
Senior notes
A1125SeniorNotes [Member]
|
Sep. 30, 2013
Senior notes
2.45% senior notes [Member]
|
Dec. 31, 2012
Senior notes
2.45% senior notes [Member]
|
Sep. 30, 2013
Senior notes
3.625% senior notes [Member]
|
Dec. 31, 2012
Senior notes
3.625% senior notes [Member]
|
Sep. 30, 2013
Senior notes
Debentures 8 Point 375 Percent Due 2020 [Member]
|
Dec. 31, 2012
Senior notes
Debentures 8 Point 375 Percent Due 2020 [Member]
|
Sep. 30, 2013
Senior notes
Floating rate senior notes
|
Dec. 31, 2012
Senior notes
Floating rate senior notes
|
Sep. 30, 2013
Debentures [Member]
8.375% debentures due 2030 [Member]
|
Sep. 30, 2013
Debentures [Member]
8.375% debentures due 2020 [Member]
|
Sep. 30, 2013
Facility notes and bonds
|
Dec. 31, 2012
Facility notes and bonds
|
Sep. 30, 2013
Pound Sterling notes
|
Sep. 30, 2013
Pound Sterling notes
Pound Sterling Notes 5 Point 5 Percent [Member]
|
Dec. 31, 2012
Pound Sterling notes
Pound Sterling Notes 5 Point 5 Percent [Member]
|
Sep. 30, 2013
Pound Sterling notes
Pound Sterling Notes 5 Point 13 Percent [Member]
|
Dec. 31, 2012
Pound Sterling notes
Pound Sterling Notes 5 Point 13 Percent [Member]
|
Sep. 30, 2013
Capital Lease Obligations
|
Dec. 31, 2012
Capital Lease Obligations
|
Sep. 30, 2013
Other debt
|
Dec. 31, 2012
Other debt
|
|
Debt Instrument [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||
Debt Instrument, Face Amount | $ 12,395 | $ 1,750 | $ 1,000 | $ 1,652 | $ 0 | $ 1,000 | $ 750 | $ 1,000 | $ 276 | $ 1,500 | $ 1,500 | $ 500 | $ 375 | $ 1,000 | $ 375 | $ 424 | $ 377 | $ 320 | $ 107 | $ 731 | $ 488 | $ 20 | |||||||||||||||||||||||
Long-term Debt and Capital Lease Obligations | 12,600 | 12,870 | |||||||||||||||||||||||||||||||||||||||||||
Maturity - Minimum Date | Dec. 31, 2013 | Jan. 01, 2049 | Jan. 01, 2020 | Jan. 01, 2015 | Jan. 01, 2031 | Dec. 31, 2013 | Jan. 01, 2013 | ||||||||||||||||||||||||||||||||||||||
Maturity - Maximum Date | Dec. 31, 2013 | Jan. 15, 2013 | Apr. 15, 2014 | Jan. 15, 2018 | Apr. 15, 2019 | Jan. 15, 2021 | Jan. 15, 2038 | Nov. 15, 2040 | Oct. 01, 2017 | Oct. 01, 2022 | Oct. 01, 2042 | Jan. 01, 2053 | Jan. 01, 2030 | Jan. 01, 2036 | Jan. 01, 2050 | Jan. 01, 3004 | Jan. 01, 2022 | ||||||||||||||||||||||||||||
Debt instrument, stated interest rate | 4.50% | 3.875% | 4.50% | 3.875% | 5.50% | 5.125% | 3.125% | 6.20% | 4.875% | 1.125% | 2.45% | 3.625% | 8.375% | 8.375% | |||||||||||||||||||||||||||||||
Total debt | 1,652 | 0 | 0 | 1,751 | 1,014 | 1,033 | 824 | 851 | 1,093 | 1,140 | 283 | 284 | 1,605 | 1,655 | 1,481 | 1,480 | 489 | 489 | 368 | 373 | 934 | 996 | 367 | 367 | 487 | 512 | 373 | 374 | 320 | 320 | 103 | 103 | 699 | 699 | 488 | 440 | 20 | 3 | |||||||
Less current maturities | (1,703) | (1,781) | |||||||||||||||||||||||||||||||||||||||||||
Long-Term Debt | $ 10,897 | $ 11,089 |