Line of Business Information - Summary of Line of Business (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Servicing fees	$ 5,016	$ 4,922	$ 5,087
Management fees	2,124	1,876	1,939
Foreign exchange trading services	1,401	1,265	1,376
Securities finance	438	426	416
Software and processing fees	888	811	789
Other fee revenue	289	180	(1)
Total fee revenue	10,156	9,480	9,606
Net interest income	2,923	2,759	2,544
Total other income	(79)	(294)	(2)
Total revenue	13,000	11,945	12,148
Provision for credit losses	75	46	20
Compensation and employee benefits expenses	4,697	4,744	4,428
Information systems and communications	1,829	1,703	1,630
Transaction processing services	998	957	971
Other	2,006	2,179	1,772
Total expenses	9,530	9,583	8,801
Income before income tax expense	$ 3,395	$ 2,316	$ 3,327
Pre-tax margin	26.00%	19.00%	27.00%
Average assets (in billions)	$ 311,700	$ 274,700	$ 286,400
Operating Segments | Investment Servicing
Segment Reporting Information [Line Items]
Servicing fees	5,016	4,922	5,087
Management fees	0	0	0
Foreign exchange trading services	1,248	1,140	1,271
Securities finance	415	402	397
Software and processing fees	888	811	789
Other fee revenue	188	145	46
Total fee revenue	7,755	7,420	7,590
Net interest income	2,899	2,740	2,551
Total other income	2	0	(2)
Total revenue	10,656	10,160	10,139
Provision for credit losses	75	46	20
Compensation and employee benefits expenses	4,078	4,033	3,896
Information systems and communications	1,743	1,568	1,535
Transaction processing services	825	777	809
Other	1,041	1,035	1,020
Total expenses	7,687	7,413	7,260
Income before income tax expense	$ 2,894	$ 2,701	$ 2,859
Pre-tax margin	27.00%	27.00%	28.00%
Average assets (in billions)	$ 308,500	$ 271,500	$ 283,200
Operating Segments | Investment Management
Segment Reporting Information [Line Items]
Servicing fees	0	0	0
Management fees	2,124	1,876	1,939
Foreign exchange trading services	138	125	82
Securities finance	23	24	19
Software and processing fees	0	0	0
Other fee revenue	35	35	(47)
Total fee revenue	2,320	2,060	1,993
Net interest income	24	19	(7)
Total other income	0	0	0
Total revenue	2,344	2,079	1,986
Provision for credit losses	0	0	0
Compensation and employee benefits expenses	555	520	478
Information systems and communications	86	94	95
Transaction processing services	173	180	162
Other	841	746	661
Total expenses	1,655	1,540	1,396
Income before income tax expense	$ 689	$ 539	$ 590
Pre-tax margin	29.00%	26.00%	30.00%
Average assets (in billions)	$ 3,200	$ 3,200	$ 3,200
Other
Segment Reporting Information [Line Items]
Servicing fees	0	0	0
Management fees	0	0	0
Foreign exchange trading services	15	0	23
Securities finance	0	0	0
Software and processing fees	0	0	0
Other fee revenue	66	0	0
Total fee revenue	81	0	23
Net interest income	0	0	0
Total other income	(81)	(294)	0
Total revenue	0	(294)	23
Provision for credit losses	0	0	0
Compensation and employee benefits expenses	64	191	54
Information systems and communications	0	41	0
Transaction processing services	0	0	0
Other	124	398	91
Total expenses	188	630	145
Income before income tax expense	$ (188)	$ (924)	$ (122)