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Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total accumulated other comprehensive income $ 313 $ 496 $ 422
Balance, beginning of year 496 422  
Net unrealized (loss) gain (39) 75 (41)
Net unrealized loss (5) (4) (6)
Balance, end of year 313 496 422
Accumulated Translation Adjustment [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total accumulated other comprehensive income 454 629 547
Balance, beginning of year 629 547 759
Net unrealized (loss) gain (133) 86 (171)
Repurchase of shares under normal course issuer bids [note 19] (42) (4) (41)
Balance, end of year 454 629 547
Accumulated Net (Loss) Gain from Designated or Qualifying Cash Flow Hedges [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total accumulated other comprehensive income (20) 34 (23)
Balance, beginning of year 34 (23) 40
Net unrealized (loss) gain (39) 75 (41)
Reclassification of net gain to net income (15) (18) (22)
Balance, end of year (20) 34 (23)
Accumulated Net Unrealized Loss On Other Long Term Liabilities [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total accumulated other comprehensive income (117) (168) (107)
Balance, beginning of year (168) (107) (58)
Net unrealized gain (loss) 44 (72) (52)
Reclassification of net gain to net income 7 11 3
Balance, end of year (117) (168) (107)
Accumulated Net Unrealized Investment (Loss) Gain [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total accumulated other comprehensive income (4) 1 5
Balance, beginning of year 1 5 11
Net unrealized loss (5) (4) (6)
Balance, end of year $ (4) $ 1 $ 5