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Income Taxes - Tax Effected Operating Loss, Capital Loss, and Tax Credit Carryovers (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Federal jurisdiction  
Tax effected operating loss, capital loss, and tax credit carryovers  
Tax effected operating loss, capital loss, and tax credit carryovers $ 82
Federal jurisdiction | Maximum  
Tax effected operating loss, capital loss, and tax credit carryovers  
Tax effected operating loss, capital loss, and tax credit carryovers, expiration date 10 years
Federal jurisdiction | Minimum  
Tax effected operating loss, capital loss, and tax credit carryovers  
Tax effected operating loss, capital loss, and tax credit carryovers, expiration date 1 year
State jurisdiction  
Tax effected operating loss, capital loss, and tax credit carryovers  
Tax effected operating loss, capital loss, and tax credit carryovers $ 79
State jurisdiction | Maximum  
Tax effected operating loss, capital loss, and tax credit carryovers  
Tax effected operating loss, capital loss, and tax credit carryovers, expiration date 11 years
State jurisdiction | Minimum  
Tax effected operating loss, capital loss, and tax credit carryovers  
Tax effected operating loss, capital loss, and tax credit carryovers, expiration date 1 year
International jurisdiction  
Tax effected operating loss, capital loss, and tax credit carryovers  
Tax effected operating loss, capital loss, and tax credit carryovers $ 55
International jurisdiction | Minimum  
Tax effected operating loss, capital loss, and tax credit carryovers  
Tax effected operating loss, capital loss, and tax credit carryovers, expiration date 1 year