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Litigations - Contingent liabilities (Details) R$ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 BRL (R$) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 BRL (R$) | Dec. 31, 2019 USD ($)
Tax litigation |  |  |  |
Contingent liabilities |  |  |  |
Contingent liabilities |  | $ 6,911 |  | $ 8,040
Civil litigation |  |  |  |
Contingent liabilities |  |  |  |
Contingent liabilities |  | 1,348 |  | 1,518
Labor litigation |  |  |  |
Contingent liabilities |  |  |  |
Contingent liabilities |  | 563 |  | 773
Environmental litigation |  |  |  |
Contingent liabilities |  |  |  |
Contingent liabilities |  | 907 |  | 1,094
Provision for litigations |  |  |  |
Contingent liabilities |  |  |  |
Contingent liabilities |  | 9,729 |  | 11,425
CFEM-related proceedings |  |  |  |
Contingent liabilities |  |  |  |
Estimated losses on legal proceedings | R$ 10,730 | 2,065 | R$ 7,715 | 1,914
Assessments and legal proceedings related to PIS/COFINS |  |  |  |
Contingent liabilities |  |  |  |
Estimated losses on legal proceedings | 5,602 | 1,078 | 5,442 | 1,350
VAT on Services |  |  |  |
Contingent liabilities |  |  |  |
Estimated losses on legal proceedings | 3,369 | 648 | 3,057 | 758
Tax assessment on Services |  |  |  |
Contingent liabilities |  |  |  |
Estimated losses on legal proceedings | 1,558 | 300 | 1,445 | 358
Tax on Services |  |  |  |
Contingent liabilities |  |  |  |
Estimated losses on legal proceedings | 2,621 | 504 | 2,405 | 597
Penalties On Tax Credit |  |  |  |
Contingent liabilities |  |  |  |
Estimated losses on legal proceedings | 1,542 | 297 | R$ 1,535 | $ 381
Assessment On JCP |  |  |  |
Contingent liabilities |  |  |  |
Tax impact on excluding penalties | 3,423 | 659 |  |
Tax Impact Including Penalties And Interests | R$ 698 | $ 134 |  |

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