Income Taxes, Reconciliation between Federal Income Tax Expense at Statutory Rates and Actual Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income (loss) before income tax [Abstract]
U.S.	$ 2,058	$ (768)	$ 1,145
Foreign	124	(696)	(26)
Income (loss) before income tax	2,182	(1,464)	1,119
Income tax expense (benefit) at statutory rate	458	(307)	235
Increase (decrease) in income tax expense (benefit) resulting from [Abstract]
Effect of the 2017 tax act			(14)
Exempt investment income	(48)	(49)	(50)
Foreign related tax differential	(2)	63	(55)
Taxes related to domestic affiliate	40		(15)
Valuation allowance	1	55	12
Unrecognized tax positions, settlements and adjustments relating to prior years		68	97
State taxes	24	4	37
Other	6	(7)	1
Income tax expense (benefit)	$ 479	$ (173)	$ 248