Income Taxes - Provision for Federal Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Provision (Benefit)
Current income tax benefit (provision)	$ (3,317)	$ (3,505)	$ (5,521)
Deferred income tax provision (provision)	(1,231)	195	(252)
Provision for federal income taxes	$ (4,548)	$ (3,310)	$ (5,773)
Effective Income Tax Rate Reconciliation
Statutory corporate tax rate	21.00%	21.00%	21.00%
Research tax credits	(0.20%)	(1.50%)	0.00%
Equity investments in affordable housing projects	(0.20%)	(0.10%)	(0.10%)
Valuation allowance	0.10%	0.70%	0.00%
Other	0.00%	0.30%	(0.20%)
Effective tax rate	20.70%	20.40%	20.70%