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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 Interest [Member]
Beginning Balance at Dec. 31, 2009 $ 7,299   $ 3,779   $ 32   $ 2,803 $ 685  
Beginning Balance, shares at Dec. 31, 2009     223,900,000            
Net income 1,003           1,003    
Other comprehensive income (loss) 70             70  
Contribution to subsidiaries by non-controlling interests 3               3
Shares issued on exercise of stock options 48   58   (10)        
Shares issued on exercise of stock options, shares     1,500,000            
Release of restricted stock 0   6   (6)        
Repurchase and cancellation under normal course issuer bid [note 18] (27)   (11)       (13) (3)  
Repurchase and cancellation under normal course issuer bid, shares [note 18]     (800,000)            
Shares issued under the Arrangement [note 18] 666   666            
Shares issued under the Arrangement, shares [note 18]     18,000,000            
Repurchase of Class B Shares [note 18] (976)           (976)    
Stock-based compensation expense [note 17] 52       52        
Settlement of stock options (12)       (12)        
Dividends paid (100)   2       (102)    
Ending Balance at Dec. 31, 2010 8,026   4,500   56   2,715 752 3
Ending 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     1,400,000            
Release of restricted stock 0   6   (6)        
Repurchase and cancellation under normal course issuer bid [note 18] (407)   (204)       (162) (41)  
Repurchase and cancellation under normal course issuer bid, shares [note 18]     (10,700,000)            
Stock-based compensation expense [note 17] 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     400,000            
Release of restricted stock 0 0 5 5 (5) (5)      
Repurchase and cancellation under normal course issuer bid [note 18] (42)   (18)       (20) (4)  
Repurchase and cancellation under normal course issuer bid, shares [note 18]     (800,000)            
Stock-based compensation expense [note 17] 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