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Accumulated Other Comprehensive Loss - Summary of Income Tax Benefit to Component of Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total income tax benefit | $ 80 | $ 80
Balance, beginning of year | 80 |
Balance, end of year | 128 | 80
Accumulated Net (Loss) Gain from Designated or Qualifying Cash Flow Hedges [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total income tax benefit | 44 | 4
Balance, beginning of year | 44 | 4
Net unrealized (gain) loss | 92 | 41
Reclassification of net loss to net income | (39) | (1)
Balance, end of year | 97 | 44
Other Long-Term Liabilities [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total income tax benefit | 36 | 14
Balance, beginning of year | 36 | 14
Net unrealized (gain) loss | (3) | 23
Reclassification of net loss to net income | (2) | (1)
Balance, end of year | $ 31 | $ 36

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