Quarterly report pursuant to Section 13 or 15(d)

Carrying Value of Outstanding Debt (Detail)

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Carrying Value of Outstanding Debt (Detail) - USD ($)
6 Months Ended
Jun. 30, 2018
Jan. 15, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 23,629,000,000    
Debt instrument, stated interest rate 8.375%    
Total debt $ 22,711,000,000   $ 24,289,000,000
Less current maturities (2,591,000,000)   (4,011,000,000)
Long-Term Debt 20,120,000,000   20,278,000,000
Commercial Paper      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 2,530,000,000    
Maturity - Minimum Date Mar. 31, 2017    
Maturity - Maximum Date Dec. 31, 2018    
Total debt $ 2,530,000,000   3,203,000,000
Senior notes | 5.50% stated rate      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 750,000,000    
Maturity - Maximum Date Dec. 31, 2018    
Debt instrument, stated interest rate 5.50% 5.50%  
Total debt $ 0   751,000,000
Senior notes | 5.125% stated rate      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 1,000,000,000    
Maturity - Maximum Date Dec. 31, 2019    
Debt instrument, stated interest rate 5.125%    
Total debt $ 1,007,000,000   1,019,000,000
Senior notes | 3.125% stated rate      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 1,500,000,000    
Maturity - Maximum Date Dec. 31, 2021    
Debt instrument, stated interest rate 3.125%    
Total debt $ 1,516,000,000   1,549,000,000
Senior notes | 2.050% senior notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 700,000,000    
Maturity - Maximum Date Dec. 31, 2021    
Debt instrument, stated interest rate 2.05%    
Total debt $ 697,000,000   696,000,000
Senior notes | 2.400% senior note      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 500,000,000    
Maturity - Maximum Date Dec. 31, 2026    
Total debt $ 497,000,000   497,000,000
Senior notes | 3.050% senior notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 1,000,000,000    
Maturity - Maximum Date Dec. 31, 2027    
Debt instrument, stated interest rate 3.05%    
Total debt $ 991,000,000   990,000,000
Senior notes | 2.45% senior notes      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 1,000,000,000    
Maturity - Maximum Date Dec. 31, 2022    
Debt instrument, stated interest rate 2.45%    
Total debt $ 956,000,000   979,000,000
Senior notes | 2.350% senior notes      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 600,000,000    
Maturity - Maximum Date Dec. 31, 2022    
Debt instrument, stated interest rate 2.35%    
Total debt $ 597,000,000   597,000,000
Senior notes | 2.500% senior notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 1,000,000,000    
Maturity - Maximum Date Dec. 31, 2023    
Debt instrument, stated interest rate 2.50%    
Total debt $ 993,000,000   992,000,000
Senior notes | 2.800% senior notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 500,000,000    
Maturity - Maximum Date Dec. 31, 2024    
Debt instrument, stated interest rate 2.80%    
Total debt $ 496,000,000   495,000,000
Senior notes | 6.20% stated rate      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 1,500,000,000    
Maturity - Maximum Date Dec. 31, 2038    
Debt instrument, stated interest rate 6.20%    
Total debt $ 1,482,000,000   1,482,000,000
Senior notes | 4.875% stated rate      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 500,000,000    
Maturity - Maximum Date Dec. 31, 2040    
Debt instrument, stated interest rate 4.875%    
Total debt $ 490,000,000   489,000,000
Senior notes | 3.625% senior notes      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 375,000,000    
Maturity - Maximum Date Dec. 31, 2042    
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    
Maturity - Maximum Date Dec. 31, 2046    
Debt instrument, stated interest rate 3.40%    
Total debt $ 491,000,000   491,000,000
Senior notes | 3.750% senior notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 1,150,000,000    
Maturity - Maximum Date Dec. 31, 2047    
Debt instrument, stated interest rate 3.75%    
Total debt $ 1,136,000,000   1,135,000,000
Senior notes | Floating Rate Senior Notes 2 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 350,000,000    
Maturity - Maximum Date Dec. 31, 2021    
Total debt $ 348,000,000   348,000,000
Senior notes | 8.375% debentures      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 424,000,000    
Maturity - Maximum Date Dec. 31, 2029    
Debt instrument, stated interest rate 8.375%    
Total debt $ 436,000,000   447,000,000
Senior notes | 8.375% debentures      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 276,000,000    
Maturity - Maximum Date Dec. 31, 2030    
Total debt $ 281,000,000   282,000,000
Senior notes | Canadian senior note 2.125%      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 566,000,000    
Maturity - Maximum Date Dec. 31, 2024    
Debt instrument, stated interest rate 2.125%    
Total debt $ 563,000,000   593,000,000
Senior notes | Floating rate senior notes      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 400,000,000    
Maturity - Maximum Date Dec. 31, 2022    
Total debt $ 398,000,000   398,000,000
Senior notes | Floating Rate Senior Notes 3 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 500,000,000    
Maturity - Maximum Date Dec. 31, 2023    
Total debt $ 499,000,000   496,000,000
Senior notes | Floating Rate Senior Notes 4 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 1,043,000,000    
Maturity - Minimum Date Dec. 31, 2049    
Maturity - Maximum Date Dec. 31, 2067    
Total debt $ 1,030,000,000   1,032,000,000
Capital Lease Obligations      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 563,000,000    
Maturity - Minimum Date Dec. 31, 2018    
Maturity - Maximum Date Dec. 31, 3005    
Total debt $ 563,000,000   500,000,000
Pound Sterling notes | 5.500% notes      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 88,000,000    
Maturity - Maximum Date Dec. 31, 2031    
Debt instrument, stated interest rate 5.50%    
Total debt $ 87,000,000   84,000,000
Pound Sterling notes | 5.125% notes      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 600,000,000    
Maturity - Maximum Date Jan. 01, 2022    
Debt instrument, stated interest rate 5.125%    
Total debt $ 566,000,000   586,000,000
Euro Senior Notes | 0.375% Euro Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 816,000,000    
Maturity - Maximum Date Dec. 31, 2023    
Debt instrument, stated interest rate 0.375%    
Total debt $ 810,000,000   832,000,000
Euro Senior Notes | 1.625% Euro Senior Notes      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 816,000,000    
Maturity - Maximum Date Dec. 31, 2025    
Debt instrument, stated interest rate 1.625%    
Total debt $ 811,000,000   833,000,000
Euro Senior Notes | 1.000% notes      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 583,000,000    
Maturity - Maximum Date Dec. 31, 2028    
Debt instrument, stated interest rate 1.00%    
Total debt $ 579,000,000   595,000,000
Euro Senior Notes | 1.500% Euro Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 583,000,000    
Maturity - Maximum Date Dec. 31, 2032    
Debt instrument, stated interest rate 1.50%    
Total debt $ 578,000,000   594,000,000
Euro Senior Notes | Floating-rate senior notes      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 583,000,000    
Maturity - Maximum Date Dec. 31, 2020    
Total debt $ 581,000,000   598,000,000
Facility notes and bonds      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 320,000,000    
Maturity - Minimum Date Dec. 31, 2029    
Maturity - Maximum Date Dec. 31, 2045    
Total debt $ 321,000,000   319,000,000
Other debt      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 13,000,000    
Maturity - Minimum Date Dec. 31, 2018    
Maturity - Maximum Date Dec. 31, 2022    
Total debt $ 13,000,000   $ 19,000,000