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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Carrying value of debt | $ 9,042 | $ 9,310
Net repayments | 277 |
Reported Value Measurement [Member] |  |
Debt Instrument [Line Items] |  |
Carrying value of debt | 9,000 | 9,300
Estimate of Fair Value Measurement [Member] |  |
Debt Instrument [Line Items] |  |
Fair value of debt | $ 9,500 | $ 9,700

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