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Income taxes - Changes in deferred tax (Details) R$ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 BRL (R$) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Total |  |  |  |
Balance at beginning of period |  | $ 7,335 | $ (5,376) |
Effect in income statement |  | 2,960 | 2,117 | $ 924
Acquisition of subsidiaries |  |  | (146) |
Translation adjustment |  | (1,774) | (234) |
Other comprehensive income |  | 44 | 222 |
Balance at end of period |  | 8,565 | 7,335 | (5,376)
Assets |  |  |  |
Balance at beginning of period |  | 9,217 | 6,908 |
Effect in income statement |  | 2,852 | 1,907 |
Transfers between asset and liabilities |  | 38 | 252 |
Acquisition of subsidiaries |  |  | 104 |
Translation adjustment |  | (1,811) | (187) |
Other comprehensive income |  | 39 | 233 |
Balance at end of period |  | 10,335 | 9,217 | 6,908
Liabilities |  |  |  |
Balance at beginning of period | R$ 1,882 | 1,882 | 1,532 | 362
Effect in income statement |  | (108) | (210) |
Transfers between asset and liabilities |  | 38 | 252 |
Acquisition of subsidiaries |  |  | 250 |
Translation adjustment |  | (37) | 47 |
Other comprehensive income |  | (5) | 11 |
Balance at end of period |  | $ 1,770 | 1,882 | $ 1,532
Limitation of tax loss carryforward in Brazil, as percent of taxable income | 30.00% | 30.00% |  |
Tax losses carryforward |  |  |  |
Total |  |  |  |
Balance at beginning of period |  | $ 4,659 |  |
Effect in income statement |  | 374 |  |
Balance at end of period |  | 4,328 | 4,659 |
Assets |  |  |  |
Effect in income statement |  | 374 |  |
Employee post retirement obligations |  |  |  |
Total |  |  |  |
Balance at beginning of period |  | 840 |  |
Balance at end of period |  | 744 | 840 |
Provision For litigation |  |  |  |
Total |  |  |  |
Balance at beginning of period |  | 443 |  |
Balance at end of period |  | 356 | 443 |
Timing differences arising on assets and liabilities |  |  |  |
Total |  |  |  |
Balance at beginning of period |  | 3,246 |  |
Effect in income statement |  | 1,690 | 2,113 |
Balance at end of period |  | 4,331 | 3,246 |
Assets |  |  |  |
Effect in income statement |  | 1,690 | 2,113 |
Fair value of financial instruments |  |  |  |
Total |  |  |  |
Balance at beginning of period |  | 864 |  |
Effect in income statement |  | 756 | 328 |
Balance at end of period |  | 1,355 | 864 |
Assets |  |  |  |
Effect in income statement |  | 756 | 328 |
Allocated goodwill |  |  |  |
Total |  |  |  |
Balance at beginning of period |  | (2,640) |  |
Effect in income statement |  | 108 | 210 |
Balance at end of period |  | (2,623) | (2,640) |
Liabilities |  |  |  |
Effect in income statement |  | (108) | (210) |
Others |  |  |  |
Total |  |  |  |
Balance at beginning of period |  | 401 |  |
Effect in income statement |  | 32 | (91) |
Balance at end of period |  | 516 | 401 |
Assets |  |  |  |
Effect in income statement |  | 32 | (91) |
Temporary differences |  |  |  |
Total |  |  |  |
Balance at beginning of period |  | 2,676 |  |
Balance at end of period |  | $ 4,237 | 2,676 |
Utilization of taxes losses carryforward |  |  |  |
Total |  |  |  |
Effect in income statement |  |  | (443) |
Assets |  |  |  |
Effect in income statement |  |  | $ (443) |

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