Derivatives - Gains and Losses on Fair Value Hedge (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Interest income	$ 129,820	$ 117,877	$ 105,363
Interest Expense, Operating and Nonoperating	(108,417)	(98,140)	(86,821)
Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	740	869	963
Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	(1,597)	(3,254)	(4,438)
Interest rate risk on held-for-investment mortgage loan | Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	894	(1,857)	671
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	(942)	1,650	(854)
Interest accrual on fair value hedging derivatives for held-for-investment loan	541	874	948
Discontinued hedge related basis adjustment amortization	247	202	198
Interest rate risk on debt | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(2,038)	(1,816)	(3,080)
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	2,068	1,831	3,084
Interest accruals on fair value hedging derivatives for debt	(1,605)	(3,261)	(4,065)
Discontinued hedge related basis adjustment amortization	$ (22)	$ (8)	$ (377)