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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

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