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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, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated net unrealized loss on translation of net investment in foreign operations $ 7 $ 7
Balance, beginning of year 28  
Balance, end of year 27 28
Accumulated Net (Loss) Gain from Designated or Qualifying Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of year (14) 23
Net unrealized loss (gain) 12 (36)
Reclassification of net loss to net income (13) (1)
Balance, end of year (15) (14)
Accumulated Net Unrealized Loss On Other Long Term Liabilities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of year 35 21
Net unrealized loss (gain) 1 15
Reclassification of net loss to net income (1) (1)
Balance, end of year $ 35 $ 35