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Consolidated Statements of Changes in Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Shares [Member]
Contributed Surplus [Member]
Retained Earnings [Member]
AOCL [Member]
 [1]
Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2015 $ 9,117 $ 3,942 $ 107 $ 6,387 $ (1,470) $ 151
Beginning Balance, shares at Dec. 31, 2015   402.3        
Net income 2,074     2,031   43
Other comprehensive income (loss) (26)       (1) (25)
Shares issued on exercise of stock options 33 $ 47 (14)      
Shares issued on exercise of stock options, shares   2.1        
Release of stock and stock units   $ 25 (25)      
Release of stock and stock units, shares   0.4        
Shares repurchased for tax withholdings on vesting of equity awards (9) $ (2)   (7)    
Shares repurchased for tax withholdings on vesting of equity awards, shares   (0.2)        
Repurchase and cancellation under normal course issuer bids [note 19] (904) $ (220)   (704) 20  
Repurchase and cancellation under normal course issuer bid, shares   (22.4)        
Acquisitions [note 6] 288         288
Stock-based compensation expense 37   37      
Dividends paid to non-controlling interests (6)         (6)
Dividends paid (385) $ 4   (389)    
Dividends paid, shares   0.1        
Ending Balance at Dec. 31, 2016 10,219 $ 3,796 105 7,318 (1,451) 451
Ending Balance, shares at Dec. 31, 2016   382.3        
Net income 2,255     2,206   49
Other comprehensive income (loss) 876       844 32
Shares issued on exercise of stock options 44 $ 56 (12)      
Shares issued on exercise of stock options, shares   1.7        
Release of stock and stock units   $ 22 (22)      
Release of stock and stock units, shares   0.4        
Shares repurchased for tax withholdings on vesting of equity awards (11) $ (2)   (9)    
Shares repurchased for tax withholdings on vesting of equity awards, shares   (0.2)        
Repurchase and cancellation under normal course issuer bids [note 19] (1,271) $ (262)   (1,030) 21  
Repurchase and cancellation under normal course issuer bid, shares   (26.2)        
Contribution by non-controlling interests 10         10
Stock-based compensation expense 48   48      
Reclassification of tax effect [note 20]       11 (11)  
Dividends paid to non-controlling interests (38)         (38)
Dividends paid (400) $ 7   (407)    
Dividends paid, shares   0.1        
Ending Balance at Dec. 31, 2017 $ 11,732 $ 3,617 $ 119 $ 8,089 $ (597) $ 504
Ending Balance, shares at Dec. 31, 2017   358.1        
[1] AOCL is Accumulated Other Comprehensive Loss.