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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, 2017 $ 11,715 $ 3,617 $ 119 $ 8,077 $ (600) $ 502
Beginning Balance, shares at Dec. 31, 2017   358.1        
Net income 2,332     2,296   36
Other comprehensive income (loss) (629)       (604) (25)
Shares issued on exercise of stock options 50 $ 60 (10)      
Shares issued on exercise of stock options, shares   1.3        
Release of stock and stock units   $ 30 (30)      
Release of stock and stock units, shares   0.6        
Shares repurchased for tax withholdings on vesting of equity awards (16) $ (3)   (13)    
Shares repurchased for tax withholdings on vesting of equity awards, shares   (0.3)        
Repurchase and cancellation under normal course issuer bids [note 20] (1,831) $ (334)   (1,526) 29  
Repurchase and cancellation under normal course issuer bid, shares   (32.6)        
Stock-based compensation expense 41   41      
Contribution by non-controlling interests 4         4
Acquisitions 10         10
Dividends paid to non-controlling interests (69)         (69)
Dividends paid (448) $ 10   (458)    
Dividends paid, shares   0.2        
Ending Balance at Dec. 31, 2018 11,159 $ 3,380 120 8,376 (1,175) 458
Ending Balance, shares at Dec. 31, 2018   327.3        
Adoption of ASU | Accounting Standards Update 2016-02 [Member] (25)     (25)    
Balance as adjusted 11,134 $ 3,380 120 8,351 (1,175) 458
Balance as adjusted, shares   327.3        
Net income 1,632 $ 0 0 1,765 0 (133)
Other comprehensive income (loss) 42 0 0 0 49 (7)
Shares issued on exercise of stock options 44 $ 53 (9) 0 0 0
Shares issued on exercise of stock options, shares   1.2        
Release of stock and stock units   $ 20 (20) 0 0 0
Release of stock and stock units, shares   0.3        
Shares repurchased for tax withholdings on vesting of equity awards (9) $ (2) 0 (7) 0 0
Shares repurchased for tax withholdings on vesting of equity awards, shares   (0.1)        
Repurchase and cancellation under normal course issuer bids [note 20] (1,289) $ (268) 0 (1,049) 28 0
Repurchase and cancellation under normal course issuer bid, shares   (25.8)        
Stock-based compensation expense 36 $ 0 36 0 0 0
Contribution by non-controlling interests 4 0 0 0 0 4
Sale of business [note 3] 8 0 [1] 0 [1] 0 [1] 8 0
Dividends paid to non-controlling interests (22) 0 0 0 0 (22)
Dividends paid (449) $ 15 0 (464) 0 0
Dividends paid, shares   0.3        
Ending Balance at Dec. 31, 2019 $ 11,131 $ 3,198 $ 127 $ 8,596 $ (1,090) $ 300
Ending Balance, shares at Dec. 31, 2019   303.2        
[1] AOCL is Accumulated Other Comprehensive Loss.