Income Taxes (Reconciliation between the Company's federal income tax (expense) benefit at statutory rates and the recorded income tax (expense) benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense at statutory rates	$ (172)	$ (257)	$ (203)
Tax benefit from tax exempt income	52	53	63
Foreign taxes and credits	2	(1)	(1)
State income taxes	(6)	(14)	(13)
Other tax expense	(7)	(4)	3
Income tax expense	$ (131)	$ (223)	$ (151)