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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 9,117 $ 8,673
Net unrealized gain (loss) 1 (244)
Ending Balance 10,219 9,117
Accumulated Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1,042) (255)
Net unrealized gain (loss) (109) (798)
Repurchase of shares under normal course issuer bids [note 20] 20 11
Ending Balance (1,131) (1,042)
Accumulated Net (Loss) Gain from Designated or Qualifying Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (262) (113)
Net unrealized gain (loss) 1 (244)
Reclassification of net loss to net income 126 95
Ending Balance (135) (262)
Accumulated Net Unrealized Loss On Other Long Term Liabilities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (165) (186)
Net unrealized gain (loss) (29) 14
Reclassification of net loss to net income 9 7
Ending Balance (185) (165)
Accumulated Net Unrealized Loss on Available-for-Sale investments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1) (4)
Net unrealized gain (loss)   3
Reclassification of net loss to net income 1  
Ending Balance   (1)
AOCL [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance [1] (1,470) (558)
Ending Balance [1] $ (1,451) $ (1,470)
[1] AOCL is Accumulated Other Comprehensive Loss.