Federal Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Federal Income Taxes [Abstract]
Net operating loss carryforwards	$ 1,000
Valuation allowance	0
Unrecognized tax benefits, that, if recognized, would impact income tax expense and effective tax rate	48	$ 16
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