Revenue from Contracts with Customers - Disaggregation of Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [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
Operating Segments | Investment Servicing
Disaggregation of Revenue [Line Items]
Topic 606 revenue	6,118	6,282	6,643
All other revenue	4,042	3,857	3,154
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
Operating Segments | Investment Servicing | Servicing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	4,922	5,087	5,531
All other revenue	0	0	0
Servicing fees	4,922	5,087	5,531
Operating Segments | Investment Servicing | Management fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	0	0	0
Management fees	0	0	0
Operating Segments | Investment Servicing | Foreign exchange trading services
Disaggregation of Revenue [Line Items]
Topic 606 revenue	344	363	342
All other revenue	796	908	807
Foreign exchange trading services	1,140	1,271	1,149
Operating Segments | Investment Servicing | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	225	233	235
All other revenue	177	164	167
Securities finance	402	397	402
Operating Segments | Investment Servicing | Software and processing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	627	599	535
All other revenue	184	190	203
Software and processing fees	811	789	738
Operating Segments | Investment Servicing | Other fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	145	46	59
Other fee revenue	145	46	59
Operating Segments | Investment Servicing | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	6,118	6,282	6,643
All other revenue	1,302	1,308	1,236
Total fee revenue	7,420	7,590	7,879
Operating Segments | Investment Servicing | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	2,740	2,551	1,919
Net interest income	2,740	2,551	1,919
Operating Segments | Investment Servicing | Total other income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	0	(2)	(1)
Total other income	0	(2)	(1)
Operating Segments | Investment Management
Disaggregation of Revenue [Line Items]
Topic 606 revenue	2,001	2,021	2,115
All other revenue	78	(35)	4
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
Operating Segments | Investment Management | Servicing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	0	0	0
Servicing fees	0	0	0
Operating Segments | Investment Management | Management fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,876	1,939	2,053
All other revenue	0	0	0
Management fees	1,876	1,939	2,053
Operating Segments | Investment Management | Foreign exchange trading services
Disaggregation of Revenue [Line Items]
Topic 606 revenue	125	82	62
All other revenue	0	0	0
Foreign exchange trading services	125	82	62
Operating Segments | Investment Management | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	24	19	14
Securities finance	24	19	14
Operating Segments | Investment Management | Software and processing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	0	0	0
Software and processing fees	0	0	0
Operating Segments | Investment Management | Other fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue			0
All other revenue	35	(47)	4
Other fee revenue	35	(47)	4
Operating Segments | Investment Management | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	2,001	2,021	2,115
All other revenue	59	(28)	18
Total fee revenue	2,060	1,993	2,133
Operating Segments | Investment Management | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	19	(7)	(14)
Net interest income	19	(7)	(14)
Operating Segments | Investment Management | Total other income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	0	0	0
Total other income	0	0	0
Other
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	(294)	23	111
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
Other | Servicing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	0	0	0
Servicing fees	0	0	0
Other | Management fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	0	0	0
Management fees	0	0	0
Other | Foreign exchange trading services
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	0	23	0
Foreign exchange trading services	0	23	0
Other | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	0	0	0
Securities finance	0	0	0
Other | Software and processing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	0	0	0
Software and processing fees	0	0	0
Other | Other fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	0	0	0
Other fee revenue	0	0	0
Other | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	0	23	0
Total fee revenue	0	23	0
Other | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	0	0	0
Net interest income	0	0	0
Other | Total other income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0
All other revenue	(294)	0	111
Total other income	$ (294)	$ 0	$ 111