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Accumulated Other Comprehensive Loss - Summary of Income Tax Benefit (Expense) to Component of Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of year $ 83  
Balance, end of year 12 $ 83
Accumulated Net (Loss) Gain from Designated or Qualifying Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of year 53 97
Net unrealized (gain) loss (41) 4
Reclassification of net loss to net income (24) (48)
Balance, end of year (12) 53
Accumulated Net Unrealized Loss On Other Long Term Liabilities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of year 30 31
Net unrealized (gain) loss (1) 3
Reclassification of net loss to net income (1) (4)
Reclassification of tax effect to retained earnings (11)  
Balance, end of year 17 $ 30
Accumulated Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net unrealized (gain) loss 7  
Balance, end of year $ 7