Federal Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Federal Income Taxes [Abstract]
Net operating loss carryforwards	$ 1,400
Tax Credit Carryforward, Amount	58
Valuation allowance	0
Unrecognized tax benefits, that, if recognized, would impact income tax expense and effective tax rate	53	$ 51
Possible decrease in unrecognized tax benefits	8
Interest and penalty expense related to uncertain tax positions	0	0	$ 0
Accrued interest and penalty expense related to unrecognized tax benefits	$ 0	$ 0	$ 0