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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