Income Taxes The Provision (Benefit) of Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Current federal tax	$ 147	$ 137	$ 11
Current international tax	0	(5)	0
Total current tax	147	132	11
Deferred federal tax	136	338	(47)
Deferred international tax	0	5	0
Deferred income tax expense	136	343	(47)
Total provision (benefit) for income taxes	$ 283	$ 475	$ (36)