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Income Taxes Income taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Abstract]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
Tax Credit Carryforward, Federal $ 98    
Deferred Tax Assets, Valuation Allowance 0    
Unrecognized Tax Benefits 0    
(Amortization) Deferral of net benefits due to Tax Reform 0 $ (23) $ (23)
State and Local Income Tax Expense (Benefit), Continuing Operations 1    
Deferred Tax Assets, Other Tax Carryforwards $ 9