Offsetting Arrangements - Assets With Offsetting Arrangements (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Offsetting Assets [Line Items]
Derivatives, gross amounts of recognized assets	$ 18,445	$ 29,468
Derivatives, gross amounts offset in statement of condition	(11,185)	(18,285)
Derivatives, net amounts of assets presented in statement of condition	7,260	11,183
Derivatives, net amount	4,619	9,986
Derivatives, cash collateral and securities netting, cash offset	(1,683)	(1,860)
Derivatives, cash collateral and securities netting, cash and securities received	(2,641)	(1,197)
Derivatives, cash collateral and securities netting, net amount	(4,324)	(3,057)
Resale agreements and securities borrowing, gross amounts of recognized assets	310,967	276,151
Resale agreements and securities borrowing, gross amounts offset in statement of condition	(261,394)	(232,021)
Resale agreements and securities borrowing, net amounts of assets presented in statement of condition	49,573	44,130
Resale agreements and securities borrowing, cash and securities received	(47,725)	(42,589)
Resale agreements and securities borrowing, net amount	1,848	1,541
Total derivatives and other financial instruments, gross amounts of recognized assets	329,412	305,619
Total derivatives and other financial instruments, gross amounts offset in statement of condition	(272,579)	(250,306)
Total derivatives and other financial instruments, net amounts of assets presented in statement of condition	56,833	55,313
Total derivatives and other financial instruments, cash and securities received	(50,366)	(43,786)
Total derivatives and other financial instruments, net amount	6,467	11,527
Securities purchased under resale agreements	7,971	6,679
Cash collateral provided for securities borrowing	41,600	37,450
Foreign exchange contracts
Offsetting Assets [Line Items]
Derivatives, gross amounts of recognized assets	18,413	29,439
Derivatives, gross amounts offset in statement of condition	(9,502)	(16,424)
Derivatives, net amounts of assets presented in statement of condition	8,911	13,015
Derivatives, net amount	8,911	13,015
Interest rate contracts
Offsetting Assets [Line Items]
Derivatives, gross amounts of recognized assets	32	28
Derivatives, gross amounts offset in statement of condition	0	(1)
Derivatives, net amounts of assets presented in statement of condition	32	27
Derivatives, net amount	$ 32	27
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