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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, 2014 $ 8,673 $ 3,979 $ 83 $ 5,155 $ (558) $ 14
Beginning Balance, shares at Dec. 31, 2014   410.3        
Net income 2,007     2,013   (6)
Other comprehensive loss (925)       (923) (2)
Shares issued on exercise of stock options 35 $ 45 (10)      
Shares issued on exercise of stock options, shares   2.4        
Release of stock and stock units   $ 17 (17)      
Release of stock and stock units, shares   0.5        
Repurchase and cancellation under normal course issuer bids [note 20] (515) $ (108)   (418) 11  
Repurchase and cancellation under normal course issuer bid, shares   (11.1)        
Contribution by non-controlling interests [note 7] 46   17     29
Purchase of non-controlling interests [note 7] (2)   (2)      
Acquisitions [note 7] 116         116
Stock-based compensation expense 36   36      
Dividends paid (354) $ 9   (363)    
Dividends paid, shares   0.2        
Ending Balance at Dec. 31, 2015 9,117 $ 3,942 107 6,387 (1,470) 151
Ending Balance, shares at Dec. 31, 2015   402.3        
Net income 2,074     2,031   43
Other comprehensive 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        
Repurchase and cancellation under normal course issuer bids [note 20] (913) $ (222)   (711) 20  
Repurchase and cancellation under normal course issuer bid, shares   (22.6)        
Contribution by non-controlling interests [note 7] (1)         (1)
Acquisitions [note 7] 288         288
Stock-based compensation expense 37   37      
Dividends paid to non-controlling interests (5)         (5)
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        
[1] AOCL is Accumulated Other Comprehensive Loss.