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Consolidated Statements of Changes in Equity (USD $)
In Millions, except Share data
Total
Release of Restricted Stock Units [Member]
Common Shares [Member]
Common Shares [Member]
Release of Restricted Stock Units [Member]
Contributed Surplus [Member]
Contributed Surplus [Member]
Release of Restricted Stock Units [Member]
Retained Earnings [Member]
AOCI [Member]
Non-controlling Interests [Member]
Beginning Balance at Dec. 31, 2010 $ 8,026   $ 4,500   $ 56   $ 2,715 $ 752 $ 3
Beginning Balance, shares at Dec. 31, 2010     242,600,000            
Net income 1,015           1,018   (3)
Other comprehensive income (loss) (289)             (289)  
Contribution to subsidiaries by non-controlling interests 20               20
Acquisition of subsidiaries 7               7
Shares issued on exercise of stock options 59   69   (10)        
Shares issued on exercise of stock options, shares 2,737,253   1,400,000            
Release of restricted stock 0   6   (6)        
Repurchase and cancellation undernormal course issuer bid (407)   (204)       (162) (41)  
Repurchase and cancellation undernormal course issuer bid, shares     (10,700,000)            
Stock-based compensation expense 31       31        
Settlement of stock options (24)       (8)   (16)    
Dividends paid (236)   2       (238)    
Ending Balance at Dec. 31, 2011 8,202   4,373   63   3,317 422 27
Ending Balance, shares at Dec. 31, 2011     233,300,000            
Net income 1,426           1,433   (7)
Other comprehensive income (loss) 80             78 2
Acquisition of subsidiaries 7               7
Shares issued on exercise of stock options 14   19   (5)        
Shares issued on exercise of stock options, shares 1,525,159   400,000            
Release of restricted stock 0 0 5 5 (5) (5)      
Repurchase and cancellation undernormal course issuer bid (42)   (18)       (20) (4)  
Repurchase and cancellation undernormal course issuer bid, shares     (800,000)            
Stock-based compensation expense 39       39        
Settlement of stock options (16)       (7)   (9)    
Dividends paid (252)   7       (259)    
Dividends paid, shares     200,000            
Ending Balance at Dec. 31, 2012 9,458   4,391   80   4,462 496 29
Ending Balance, shares at Dec. 31, 2012     233,100,000            
Net income 1,545           1,561   (16)
Other comprehensive income (loss) (142)             (141) (1)
Issues of shares by subsidiaries 4               4
Shares issued on exercise of stock options 63   84   (21)        
Shares issued on exercise of stock options, shares 2,805,969   2,000,000            
Release of restricted stock 0 0 6 9 (6) (9)      
Repurchase and cancellation undernormal course issuer bid (1,020)   (271)       (707) (42)  
Repurchase and cancellation undernormal course issuer bid, shares     (14,100,000)            
Stock-based compensation expense 34       34        
Settlement of stock options (19)       (9)   (10)    
Dividends paid (284)   11       (295)    
Dividends paid, shares     200,000            
Ending Balance at Dec. 31, 2013 $ 9,639   $ 4,230   $ 69   $ 5,011 $ 313 $ 16
Ending Balance, shares at Dec. 31, 2013     221,200,000