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Income taxes - Changes in deferred tax (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Income Taxes |  |
Balance at beginning of period | $ 11,441 | $ 10,335
Balance at beginning of period | 1,881 | 1,770
Balance at beginning of period | 9,560 | 8,565
Taxes losses carryforward | (68) | 830
Taxes losses carryforward | (68) | 830
Asset retirement obligations and other provisions |  | 226
Asset retirement obligations and other provisions |  | 226
Fair value of financial instruments | (634) | 75
Fair value of financial instruments | (634) | 75
Fair value of property, plant and equipment in business combination | (330) | 138
Fair value of property, plant and equipment in business combination | 330 | (138)
Other | (255) | (27)
Other | (255) | (27)
Effect in income statement | (1,281) | 1,104
Effect in income statement | (330) | 138
Effect in income statement | (951) | 966
Transfers between assets and liabilities | (136) | (155)
Transfers between assets and liabilities | (136) | (155)
Translation adjustment | 688 | (649)
Translation adjustment | (75) | (13)
Translation adjustment | 763 | (636)
Other comprehensive income | 58 | (15)
Other comprehensive income | 101 | 141
Other comprehensive income | (43) | (156)
Tax loss carryforward from coal operations |  | 821
Tax loss carryforward from coal operations |  | 821
Timing differences arising from assets and liabilities | (324) |
Timing differences arising from assets and liabilities | (324) |
Sale of California Steel Industries | (28) |
Sale of California Steel Industries | 28 |
Balance at ending of period | 10,770 | 11,441
Balance at ending of period | 1,413 | 1,881
Balance at ending of period | $ 9,357 | $ 9,560

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