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Debt - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 4 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 24, 2018 | Nov. 30, 2018 | Sep. 30, 2016 | May 31, 2016 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 24, 2017 | Sep. 25, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest payments |  |  |  |  |  | $ 635,000,000 | $ 610,000,000 | $ 600,000,000 |  |
Short term borrowings due within one year |  |  |  |  | $ 1,500,000,000 | 1,500,000,000 | 750,000,000 |  |  |
Outstanding principal amount of debt instruments |  |  |  |  | 15,312,000,000 | 15,312,000,000 | 15,498,000,000 |  |  |
Current maturities of long-term debt and commercial paper |  |  |  |  | 1,500,000,000 | 1,500,000,000 | 750,000,000 |  |  |
Commercial paper |  |  |  |  | $ 600,000,000 | $ 600,000,000 | 0 |  |  |
Commercial paper borrowings |  |  |  |  |  |  | $ 0 |  |  |
Interest rate swaps |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative liability, notional amount |  |  |  | $ 450,000,000 |  |  |  |  |  |
1.85% due 2018 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | $ 750,000,000 |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 1.85% | 1.85% | 1.85% |  |  |
Outstanding principal amount of debt instruments |  |  |  |  | $ 0 | $ 0 | $ 750,000,000 |  |  |
4.09% due 2052 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 4.09% | 4.09% |  |  |  |
Outstanding principal amount of debt instruments |  |  |  |  | $ 1,578,000,000 | $ 1,578,000,000 | 1,578,000,000 |  |  |
4.70% To 8.50% Senior Notes Maturing 2029 To 2046 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, unamortized premium |  |  |  |  |  |  |  |  | $ 237,000,000 |
4.25% due 2019 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 4.25% | 4.25% |  |  |  |
Outstanding principal amount of debt instruments |  |  |  |  | $ 900,000,000 | $ 900,000,000 | 900,000,000 |  |  |
Unsecured Debt | Five Year Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility | $ 2,500,000,000.0 |  |  |  |  |  |  |  |  |
Line of credit facility expiration period | 5 years |  |  |  |  |  |  |  |  |
Additional amount to increase credit facility, granted at banks' discretion |  |  |  |  | 500,000,000 |  |  |  |  |
Line of credit facility, amount outstanding |  |  |  |  | $ 0 | $ 0 | $ 0 |  |  |
Senior Notes | 4.09% due 2052 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 4.09% |
Amount of issued debt |  |  |  |  |  |  |  |  | $ 1,600,000,000 |
Senior Notes | 4.70% To 8.50% Senior Notes Maturing 2029 To 2046 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, repurchase amount |  |  |  |  |  |  |  |  | $ 1,400,000,000 |
Senior Notes | 4.70% To 8.50% Senior Notes Maturing 2029 To 2046 | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 4.70% |
Senior Notes | 4.70% To 8.50% Senior Notes Maturing 2029 To 2046 | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 8.50% |
Notes Payable to Banks | 2.13% Long-Term Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 2.13%
Repayments of notes payable |  |  | $ 500,000,000 |  |  |  |  |  |  |
Notes Payable to Banks | 7.65% Long-term notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 7.65% |  |  |  |  |  |
Repayments of notes payable |  |  |  | $ 452,000,000 |  |  |  |  |  |
Commercial Paper |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  | 2.89% | 2.89% |  |  |  |

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