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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ (1,451)  
Net unrealized gain (loss) 114 $ 1
Ending Balance (597) (1,451)
Accumulated Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1,131) (1,042)
Net unrealized gain (loss) 657 (109)
Repurchase of shares under normal course issuer bids [note 19] 21 20
Ending Balance (453) (1,131)
Accumulated Net (Loss) Gain from Designated or Qualifying Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (135) (262)
Net unrealized gain (loss) 114 1
Reclassification of net loss to net income 60 126
Ending Balance 39 (135)
Accumulated Net Unrealized Loss On Other Long Term Liabilities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (185) (165)
Net unrealized gain (loss) 8 (29)
Reclassification of net loss to net income 5 9
Reclassification of tax effect to retained earnings (11)  
Ending Balance (183) (185)
Accumulated Net Unrealized Loss on Available-for-Sale investments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance   (1)
Reclassification of net loss to net income   1
AOCL [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1,451)  
Reclassification of tax effect to retained earnings [1] (11)  
Ending Balance $ (597) $ (1,451)
[1] AOCL is Accumulated Other Comprehensive Loss.