Offsetting Arrangements - Assets With Offsetting Arrangements (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Offsetting Assets [Line Items]
Derivatives, gross amounts of recognized assets	$ 24,906	$ 14,259
Derivatives, gross amounts offset in statement of condition	(16,415)	(10,104)
Derivatives, net amounts of assets presented in statement of condition	8,491	4,155
Derivatives, net amount	7,502	3,199
Cash collateral provided	(2,199)	(2,481)
Derivatives, cash collateral and securities netting, cash and securities received	(989)	(956)
Derivatives, cash collateral and securities netting, net amount	(3,188)	(3,437)
Resale agreements and securities borrowing, gross amounts of recognized assets	290,552	297,824
Resale agreements and securities borrowing, gross amounts offset in statement of condition	(234,376)	(252,779)
Resale agreements and securities borrowing, net amounts of assets presented in statement of condition	56,176	45,045
Resale agreements and securities borrowing, cash and securities received	(54,207)	(42,683)
Resale agreements and securities borrowing, net amount	1,969	2,362
Total derivatives and other financial instruments, gross amounts of recognized assets	315,458	312,083
Total derivatives and other financial instruments, gross amounts offset in statement of condition	(250,791)	(262,883)
Total derivatives and other financial instruments, net amounts of assets presented in statement of condition	64,667	49,200
Total derivatives and other financial instruments, cash and securities received	(55,196)	(43,639)
Total derivatives and other financial instruments, net amount	9,471	5,561
Securities purchased under resale agreements	8,187	6,812
Cash collateral provided for securities borrowing	47,990	38,240
Foreign exchange contracts
Offsetting Assets [Line Items]
Derivatives, gross amounts of recognized assets	24,890	14,224
Derivatives, gross amounts offset in statement of condition	(14,200)	(7,618)
Derivatives, net amounts of assets presented in statement of condition	10,690	6,606
Derivatives, net amount	10,690	6,606
Interest rate contracts
Offsetting Assets [Line Items]
Derivatives, gross amounts of recognized assets	16	34
Derivatives, gross amounts offset in statement of condition	(16)	(5)
Derivatives, net amounts of assets presented in statement of condition	0	29
Derivatives, net amount	$ 0	29
Other derivative contracts
Offsetting Assets [Line Items]
Derivatives, gross amounts of recognized assets		1
Derivatives, gross amounts offset in statement of condition		0
Derivatives, net amounts of assets presented in statement of condition		1
Derivatives, net amount		$ 1