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Statements of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Common stock [member]
Additional paid-in capital [member]
Other equity reserves [member]
Retained earnings [member]
Total controlling interest [Member]
Non-controlling interests and perpetual debentures [member]
Equity at beginning of period (Restated balance [member]) at Dec. 31, 2017 $ 10,577 $ 318 $ 9,979 $ (2,385) $ 1,094 $ 9,006 $ 1,571
Net income 570       528 528 42
Other comprehensive income (loss)for the period (25)     16   16 (41)
Total of other comprehensive income (loss)for the period 545     16 528 544 1
Own shares purchased under share repurchase program (75)     (75)   (75)  
Share-based compensation 35   34 1   35  
Coupons paid on perpetual debentures (29)     (29)   (29)  
Equity at end of period (Restated balance [member]) at Dec. 31, 2018 11,059 318 10,013 (2,472) 1,628 9,487 1,572
Equity at end of period at Dec. 31, 2018 11,053 318 10,013 (2,472) 1,622 9,481 1,572
Effects from adoption of IFRIC 23 6       6 6  
Net income 179       143 143 36
Other comprehensive income (loss)for the period (217)     (112)   (112) (105)
Total of other comprehensive income (loss)for the period (38)     (112) 143 31 (69)
Dividends (150)       (150) (150)  
Effects of mandatorily convertible securities     151 (151)      
Own shares purchased under share repurchase program (50)   (75) 25   (50)  
Share-based compensation 32   17 15   32  
Coupons paid on perpetual debentures (29)     (29)   (29)  
Equity at end of period at Dec. 31, 2019 10,824 318 10,106 (2,724) 1,621 9,321 1,503
Net income (1,446)       (1,467) (1,467) 21
Other comprehensive income (loss)for the period (348)     (146)   (146) (202)
Total of other comprehensive income (loss)for the period (1,794)     (146) (1,467) (1,613) (181)
Own shares purchased under share repurchase program (83)   (50) (33)   (83)  
Restitution of retained earnings 2,481   (2,481)   2,481    
Share-based compensation 29   29 29   29  
Changes in non-controllinginterest       445   445 (445)
Coupons paid on perpetual debentures (24)     (24)   (24)  
Equity at end of period at Dec. 31, 2020 $ 8,952 $ 318 $ 7,575 $ (2,453) $ 2,635 $ 8,075 $ 877