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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Carrying value of debt | $ 9,057 | $ 9,310
Reported Value Measurement [Member] |  |
Debt Instrument [Line Items] |  |
Carrying value of debt | 9,100 | 9,300
Significant Other Observable Inputs (Level 2) [Member] | Estimate of Fair Value Measurement [Member] |  |
Debt Instrument [Line Items] |  |
Fair value of Debt | $ 9,700 | $ 9,700

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