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Consolidated Statements of Changes in Equity - USD ($)
$ in Millions
Total
Common Shares [Member]
Contributed Surplus [Member]
Retained Earnings [Member]
AOCI [Member]
Non-controlling Interests [Member]
Beginning Balance at Dec. 31, 2013 $ 9,639 $ 4,230 $ 69 $ 5,011 $ 313 [1] $ 16
Beginning Balance, shares at Dec. 31, 2013   442,300,000        
Net income 1,880     1,882   (2)
Other comprehensive income (loss) (843)       (843) [1]  
Shares issued on exercise of stock options $ 51 $ 63 (12)      
Shares issued on exercise of stock options, shares 2,649,160 2,600,000        
Release of restricted stock   $ 5 (5)      
Release of restricted stock units   14 (14)      
Repurchase and cancellation under normal course issuer bids $ (1,783) $ (342)   (1,413)    
Repurchase and cancellation under normal course issuer bids [1]         (28)  
Repurchase and cancellation under normal course issuer bid, shares   (34,800,000)        
Stock-based compensation expense 38   38      
Reclassification of liability 7   7      
Dividends paid   $ 9        
Dividends paid (316)     (325)    
Dividends paid, shares   200,000        
Ending Balance at Dec. 31, 2014 8,673 $ 3,979 83 5,155 (558) [1] 14
Ending Balance, shares at Dec. 31, 2014   410,300,000        
Net income 2,007     2,013   (6)
Other comprehensive income (loss) (925)       (923) [1] (2)
Shares issued on exercise of stock options $ 35 $ 45 (10)      
Shares issued on exercise of stock options, shares 2,387,032 2,400,000        
Release of restricted stock   $ 5 (5)      
Release of restricted stock units   12 (12)      
Repurchase and cancellation under normal course issuer bids $ (515) $ (108)   (418)    
Repurchase and cancellation under normal course issuer bids [1]         11  
Repurchase and cancellation under normal course issuer bid, shares   (10,600,000)        
Contribution by non-controlling interests 46   17     29
Purchase of non-controlling interests (2)   (2)      
Acquisition 116         116
Stock-based compensation expense 36   36      
Dividends paid   $ 9        
Dividends paid (354)     (363)    
Dividends paid, shares   200,000        
Ending Balance at Dec. 31, 2015 $ 9,117 $ 3,942 $ 107 $ 6,387 $ (1,470) [1] $ 151
Ending Balance, shares at Dec. 31, 2015   402,300,000        
[1] AOCL is Accumulated Other Comprehensive Loss.