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Taxes - Contingency (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Contingencies |  |  |
Deferred income taxes | $ 27 | $ 23 |
Foreign | Brazil |  |  |
Contingencies |  |  |
Deferred income taxes | 22 |  |
Foreign | Brazil | Other Assets and Prepaid Expenses |  |  |
Contingencies |  |  |
Future tax credits | 64 |  |
Tax years 2005 - 2018 | Indirect tax credits | Foreign | Brazil | Maximum |  |  |
Contingencies |  |  |
Amount of indirect tax credits expected to receive |  |  | $ 66
Tax years 2005 - 2014 | Foreign | Brazil | Other operating income, net |  |  |
Contingencies |  |  |
Additional credits |  | $ 35 |
Tax years 2005 - 2014 | Indirect tax credits | Foreign | Brazil | Minimum |  |  |
Contingencies |  |  |
Amount of indirect tax credits expected to receive |  |  | $ 22
Tax years 2015 - 2018 | Foreign | Brazil | Other operating income, net |  |  |
Contingencies |  |  |
Additional credits | $ 15 |  |

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