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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ (1,090)  
Net unrealized gain (loss) (34) $ 102
Reclassification of net loss to net income 8 8
Ending Balance (733) (1,090)
Accumulated Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (907) (917)
Net unrealized gain (loss) 348 (18)
Repurchase of shares under normal course issuer bids [note 19] 8 28
Ending Balance (551) (907)
Accumulated Net (Loss) Gain from Designated or Qualifying Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 38 (68)
Net unrealized gain (loss) (34) 102
Reclassification of net loss to net income 38 4
Ending Balance 42 38
Accumulated Net Unrealized Loss On Other Long Term Liabilities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (221) (190)
Net unrealized loss (11) (47)
Reclassification of net loss to net income 8 8
Sale of business 8
Ending Balance (224) (221)
AOCL [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1,090)  
Ending Balance $ (733) $ (1,090)