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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ (1,175)  
Net unrealized gain (loss) 102 $ (106)
Net unrealized loss (47) (13)
Reclassification of net loss (gain) to net income 4 (1)
Reclassification of net loss to net income 8 6
Ending Balance (1,090) (1,175)
Accumulated Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (917) (456)
Net unrealized loss (18) (490)
Repurchase of shares under normal course issuer bids [note 21] 28 29
Ending Balance (907) (917)
Accumulated Net (Loss) Gain from Designated or Qualifying Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (68) 39
Net unrealized gain (loss) 102 (106)
Reclassification of net loss (gain) to net income 4 (1)
Ending Balance 38 (68)
Accumulated Net Unrealized Loss On Other Long Term Liabilities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (190) (183)
Net unrealized loss (47) (13)
Reclassification of net loss to net income 8 6
Sale of business 8  
Ending Balance (221) (190)
AOCL [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1,175)  
Ending Balance $ (1,090) $ (1,175)