Income Taxes The Provision (Benefit) of Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current federal tax	$ 137	$ 11	$ 129
Current international tax	(5)	0	0
Total current tax	132	11	129
Deferred federal tax	338	(47)	(444)
Deferred international tax	5	0	0
Deferred income tax expense	343	(47)	(444)
Total provision (benefit) for income taxes	$ 475	$ (36)	$ (315)