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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, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total income tax benefit $ 128 $ 128
Balance, beginning of year 128  
Balance, end of year 83 128
Accumulated Net (Loss) Gain from Designated or Qualifying Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total income tax benefit 97 44
Balance, beginning of year 97 44
Net unrealized loss (gain) 4 92
Reclassification of net loss to net income (48) (39)
Balance, end of year 53 97
Accumulated Net Unrealized Loss On Other Long Term Liabilities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total income tax benefit 31 36
Balance, beginning of year 31 36
Net unrealized loss (gain) 3 (3)
Reclassification of net loss to net income (4) (2)
Balance, end of year $ 30 $ 31