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Recent Accounting Standards (Details) - USD ($)
$ in Millions
Jan. 01, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Aggregate lease liability   $ 36   $ 0
Right of use asset   35   0
Retained earnings   $ 1,851   $ 611
ASU 2016-02        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Aggregate lease liability     $ 25  
Right of use asset     $ 23  
Cumulative Effect, Period Of Adoption, Adjustment | Forecast | Minimum | ASU 2016-13        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Retained earnings $ 75      
Cumulative Effect, Period Of Adoption, Adjustment | Forecast | Maximum | ASU 2016-13        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Retained earnings $ 135