Borrowings - Additional Information (Detail) - USD ($) |
1 Months Ended | 3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|---|
Apr. 30, 2017 |
Mar. 31, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Jun. 30, 2017 |
Dec. 31, 2016 |
|
| Debt Instrument [Line Items] | ||||||
| Borrowings | $ 4,970,000,000 | $ 4,970,000,000 | $ 4,915,000,000 | |||
| Fair Value | 5,225,000,000 | 5,225,000,000 | $ 5,200,000,000 | |||
| Amount of debt issued | $ 4,998,000,000 | 4,998,000,000 | ||||
| Repayment of notes | 700,000,000 | |||||
| Unsecured Debt 2027 Notes [Member] | ||||||
| Debt Instrument [Line Items] | ||||||
| Amount of debt issued | $ 700,000,000 | $ 700,000,000 | ||||
| Interest rate | 3.20% | 3.20% | ||||
| Senior unsecured notes maturity date | Mar. 15, 2027 | |||||
| Approximate annual interest expense | $ 22,000,000 | |||||
| Debt instrument, payment terms | Interest is payable semi-annually on March 15 and September 15 of each year, commencing September 15, 2017 | |||||
| Commercial Paper [Member] | ||||||
| Debt Instrument [Line Items] | ||||||
| Maximum amount available under facility | $ 4,000,000,000 | 4,000,000,000 | ||||
| Amount outstanding under credit facility | 0 | 0 | ||||
| 2017 Revolving Credit Facility [Member] | ||||||
| Debt Instrument [Line Items] | ||||||
| Unsecured revolving credit facility | 4,000,000,000 | 4,000,000,000 | ||||
| Additional amount available, subject to lender credit approval | 1,000,000,000 | |||||
| Maximum amount available under facility | 5,000,000,000 | 5,000,000,000 | ||||
| Amount outstanding under credit facility | $ 0 | $ 0 | ||||
| Extended debt instrument maturity date | 2022-04 | |||||
| Line of credit facility, covenant terms | The 2017 credit facility requires the Company not to exceed a maximum leverage ratio (ratio of net debt to earnings before interest, taxes, depreciation and amortization, where net debt equals total debt less unrestricted cash) of 3 to 1 | |||||
| Line of credit facility, covenant compliance | satisfied with a ratio of less than 1 to 1 | |||||
| 6.25% Notes due 2017 [Member] | ||||||
| Debt Instrument [Line Items] | ||||||
| Interest rate | 6.25% | 6.25% | ||||
| Repayment of notes | $ 700,000,000 | |||||
| Long-term debt, maturity date | 2017-09 | |||||