Line of Business Information - Summary of Line of Business (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Servicing fees	$ 4,922	$ 5,087	$ 5,531
Management fees	1,876	1,939	2,053
Foreign exchange trading services	1,265	1,376	1,211
Securities finance	426	416	416
Software and processing fees	811	789	738
Other fee revenue	180	(1)	63
Total fee revenue	9,480	9,606	10,012
Net interest income	2,759	2,544	1,905
Total other income	(294)	(2)	110
Total revenue	11,945	12,148	12,027
Provision for credit losses	46	20	(33)
Total expenses	9,583	8,801	8,889
Income before income tax expense	$ 2,316	$ 3,327	$ 3,171
Pre-tax margin	19.00%	27.00%	26.00%
Average assets (in billions)	$ 274,700	$ 286,400	$ 299,700
Operating Segments | Investment Servicing
Segment Reporting Information [Line Items]
Servicing fees	4,922	5,087	5,531
Management fees	0	0	0
Foreign exchange trading services	1,140	1,271	1,149
Securities finance	402	397	402
Software and processing fees	811	789	738
Other fee revenue	145	46	59
Total fee revenue	7,420	7,590	7,879
Net interest income	2,740	2,551	1,919
Total other income	0	(2)	(1)
Total revenue	10,160	10,139	9,797
Provision for credit losses	46	20	(33)
Total expenses	7,413	7,260	7,182
Income before income tax expense	$ 2,701	$ 2,859	$ 2,648
Pre-tax margin	27.00%	28.00%	27.00%
Average assets (in billions)	$ 271,500	$ 283,200	$ 296,500
Operating Segments | Investment Management
Segment Reporting Information [Line Items]
Servicing fees	0	0	0
Management fees	1,876	1,939	2,053
Foreign exchange trading services	125	82	62
Securities finance	24	19	14
Software and processing fees	0	0	0
Other fee revenue	35	(47)	4
Total fee revenue	2,060	1,993	2,133
Net interest income	19	(7)	(14)
Total other income	0	0	0
Total revenue	2,079	1,986	2,119
Provision for credit losses	0	0	0
Total expenses	1,540	1,396	1,445
Income before income tax expense	$ 539	$ 590	$ 674
Pre-tax margin	26.00%	30.00%	32.00%
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	0	23	0
Securities finance	0	0	0
Software and processing fees	0	0	0
Other fee revenue		0	0
Total fee revenue	0	23	0
Net interest income		0	0
Total other income	(294)	0	111
Total revenue	(294)	23	111
Provision for credit losses	0	0	0
Total expenses	630	145	262
Income before income tax expense	$ (924)	$ (122)	$ (151)