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Income Taxes Income taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Abstract]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability     $ 17
Tax Credit Carryforward, Federal $ 64    
Deferred Tax Assets, Valuation Allowance 0 $ 0  
Unrecognized Tax Benefits $ 0 $ 0