Quarterly report pursuant to Section 13 or 15(d)

Carrying Value of Outstanding Debt (Detail)

v3.2.0.727
Carrying Value of Outstanding Debt (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 12,967  
Total Debt 13,152 $ 10,787
Less current maturities (3,252) (923)
Long-Term Debt 9,900 9,864
Commercial Paper    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 3,210  
Maturity - Minimum Date Dec. 31, 2015  
Maturity - Maximum Date Dec. 31, 2015  
Total Debt $ 3,209 772
Senior notes | 5.50% stated rate    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 750  
Maturity - Maximum Date Jan. 15, 2018  
Debt instrument, stated interest rate 5.50%  
Total Debt $ 798 802
Senior notes | 5.125% stated rate    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 1,000  
Maturity - Maximum Date Apr. 15, 2019  
Debt instrument, stated interest rate 5.125%  
Total Debt $ 1,073 1,076
Senior notes | Debentures 8 Point 375 Percent Due 2030 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount 276  
Total Debt 283 283
Senior notes | 3.125% stated rate    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 1,500  
Maturity - Maximum Date Jan. 15, 2021  
Debt instrument, stated interest rate 3.125%  
Total Debt $ 1,612 1,617
Senior notes | 6.20% stated rate    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 1,500  
Maturity - Maximum Date Jan. 15, 2038  
Debt instrument, stated interest rate 6.20%  
Total Debt $ 1,481 1,481
Senior notes | 4.875% stated rate    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 500  
Maturity - Maximum Date Nov. 15, 2040  
Debt instrument, stated interest rate 4.875%  
Total Debt $ 489 489
Senior notes | A1125SeniorNotes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 375  
Maturity - Maximum Date Oct. 01, 2017  
Debt instrument, stated interest rate 1.125%  
Total Debt $ 372 370
Senior notes | 2.45% senior notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 1,000  
Maturity - Maximum Date Oct. 01, 2022  
Debt instrument, stated interest rate 2.45%  
Total Debt $ 975 977
Senior notes | 3.625% senior notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 375  
Maturity - Maximum Date Oct. 01, 2042  
Debt instrument, stated interest rate 3.625%  
Total Debt $ 368 367
Senior notes | Debentures 8 Point 375 Percent Due 2020 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount 424  
Total Debt 477 480
Senior notes | Floating rate senior notes    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 463  
Maturity - Minimum Date Jan. 01, 2049  
Maturity - Maximum Date Jan. 01, 2064  
Total Debt $ 459 459
Capital Lease Obligations    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 434  
Maturity - Minimum Date Dec. 31, 2015  
Maturity - Maximum Date Jan. 01, 3005  
Total Debt $ 434 505
Pound Sterling notes    
Debt Instrument [Line Items]    
Maturity - Minimum Date Jan. 01, 2031  
Maturity - Maximum Date Jan. 01, 2050  
Pound Sterling notes | Pound Sterling Notes 5 Point 5 Percent [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 105  
Total Debt 101 99
Pound Sterling notes | Pound Sterling Notes 5 Point 13 Percent [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount 717  
Total Debt $ 683 673
Debentures | 8.375% debentures due 2030 [Member]    
Debt Instrument [Line Items]    
Maturity - Maximum Date Jan. 01, 2030  
Debt instrument, stated interest rate 8.375%  
Debentures | 8.375% debentures due 2020 [Member]    
Debt Instrument [Line Items]    
Maturity - Minimum Date Jan. 01, 2020  
Debt instrument, stated interest rate 8.375%  
Facility notes and bonds    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 320  
Maturity - Minimum Date Jan. 01, 2015  
Maturity - Maximum Date Jan. 01, 2036  
Total Debt $ 320 320
Other debt    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 18  
Maturity - Minimum Date Jan. 01, 2015  
Maturity - Maximum Date Jan. 01, 2022  
Total Debt $ 18 $ 17