Income Taxes - Provision for Federal Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Provision (Benefit)
Current income tax benefit (provision)	$ (5,521)	$ (3,803)	$ (2,089)
Deferred income tax provision (provision)	(252)	729	(1,328)
Provision for federal income taxes	$ (5,773)	$ (3,074)	$ (3,417)
Effective Income Tax Rate Reconciliation
Statutory corporate tax rate	21.00%	21.00%	21.00%
Equity investments in affordable housing projects	(0.10%)	(0.10%)	(0.20%)
Change in unrecognized tax benefits	0.00%	0.00%	(1.20%)
Other	(0.20%)	(0.20%)	(0.20%)
Effective tax rate	20.70%	20.70%	19.40%
Unrecognized tax benefits, favorable impact			$ 205