Income Taxes Income taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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	$ 102
Deferred Tax Assets, Valuation Allowance	0
Unrecognized Tax Benefits	0
(Amortization) Deferral of net benefits due to Tax Reform	0	$ 0	$ (23)
Deferred Tax Assets, Other Tax Carryforwards	$ 9