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Income Taxes - Balances (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Income Tax [Line Items]    
Income taxes receivable $ 46 $ 15
Federal    
Income Tax [Line Items]    
Income taxes receivable 44 15
State    
Income Tax [Line Items]    
Income taxes receivable $ 2 $ 0