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Fair Value Measurements - Debt (Detail) - USD ($) $ in Billions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Reported Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of Debt | $ 10.0 | $ 9.5
Significant Other Observable Inputs (Level 2) [Member] | Estimate of Fair Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of Debt | $ 10.1 | $ 9.9

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