Income Taxes - Provision for Federal & Foreign Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Federal income tax expense (benefit):
Current	$ 1,325	$ 1,292	$ 698
Deferred	(194)	21	235
Total federal income tax expense	1,131	1,313	933
Foreign income tax expense (benefit):
Current	93	50	91
Deferred	11	(16)	(13)
Total foreign income tax expense	104	34	78
Total federal and foreign income tax expense	$ 1,235	$ 1,347	$ 1,011