Income Taxes - Difference between the Statutory Tax Rate and Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income before U.S. federal income taxes	$ 17,983	$ 21,269	$ 21,956
Effective Income Tax Rate Reconciliation, Amount
U.S. federal statutory corporate tax rate	3,776	4,467	4,611
Tax credits, amount
LIHTC investments	(417)	(311)	(213)
Research and development	(47)	(85)	(29)
Valuation allowance	(9)	(18)	30
Other adjustments, amount
Proportional amortization, net of other tax benefits, on LIHTC investments	331	255	166
Other	(15)	(17)	(17)
Provision for U.S. federal income taxes and effective tax rate	$ 3,619	$ 4,291	$ 4,548
Effective Income Tax Rate Reconciliation, Percent
U.S. federal statutory corporate tax rate	21.00%	21.00%	21.00%
Tax credits, percent
LIHTC investments	(2.30%)	(1.40%)	(1.00%)
Research and development	(0.30%)	(0.40%)	(0.10%)
Valuation allowance	0.00%	(0.10%)	0.10%
Other adjustments, percent
Proportional amortization, net of other tax benefits, on LIHTC investments	1.80%	1.20%	0.80%
Other	(0.10%)	(0.10%)	(0.10%)
Provision for U.S. federal income taxes and effective tax rate	20.10%	20.20%	20.70%