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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