Revenue from Contracts with Customers - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Servicing fees	$ 1,217	$ 1,368
Management fees	457	520
Foreign exchange trading services	342	359
Securities finance	109	96
Software and processing fees	165	201
Other fee revenue	45	29
Total fee revenue	2,335	2,573
Net interest income	766	509
Total other income	0	(1)
Total revenue	3,101	3,081
Operating Segments | Investment Servicing
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,490	1,674
All other revenue	1,106	884
Servicing fees	1,217	1,368
Management fees	0	0
Foreign exchange trading services	321	342
Securities finance	103	93
Software and processing fees	165	201
Other fee revenue	28	46
Total fee revenue	1,834	2,050
Net interest income	762	509
Total other income	0	(1)
Total revenue	2,596	2,558
Operating Segments | Investment Servicing | Servicing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,217	1,368
All other revenue	0	0
Servicing fees	1,217	1,368
Operating Segments | Investment Servicing | Management fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	0	0
Management fees	0	0
Operating Segments | Investment Servicing | Foreign exchange trading services
Disaggregation of Revenue [Line Items]
Topic 606 revenue	90	101
All other revenue	231	241
Foreign exchange trading services	321	342
Operating Segments | Investment Servicing | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	63	54
All other revenue	40	39
Securities finance	103	93
Operating Segments | Investment Servicing | Software and processing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	120	151
All other revenue	45	50
Software and processing fees	165	201
Operating Segments | Investment Servicing | Other fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	28	46
Other fee revenue	28	46
Operating Segments | Investment Servicing | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,490	1,674
All other revenue	344	376
Total fee revenue	1,834	2,050
Operating Segments | Investment Servicing | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	762	509
Net interest income	762	509
Operating Segments | Investment Servicing | Total other income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	0	(1)
Total other income	0	(1)
Operating Segments | Investment Management
Disaggregation of Revenue [Line Items]
Topic 606 revenue	478	537
All other revenue	27	(14)
Servicing fees	0	0
Management fees	457	520
Foreign exchange trading services	21	17
Securities finance	6	3
Software and processing fees	0	0
Other fee revenue	17	(17)
Total fee revenue	501	523
Net interest income	4	0
Total other income	0	0
Total revenue	505	523
Operating Segments | Investment Management | Servicing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	0	0
Servicing fees	0	0
Operating Segments | Investment Management | Management fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	457	520
All other revenue	0	0
Management fees	457	520
Operating Segments | Investment Management | Foreign exchange trading services
Disaggregation of Revenue [Line Items]
Topic 606 revenue	21	17
All other revenue	0	0
Foreign exchange trading services	21	17
Operating Segments | Investment Management | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	6	3
Securities finance	6	3
Operating Segments | Investment Management | Software and processing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	0	0
Software and processing fees	0	0
Operating Segments | Investment Management | Other fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	17	(17)
Other fee revenue	17	(17)
Operating Segments | Investment Management | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	478	537
All other revenue	23	(14)
Total fee revenue	501	523
Operating Segments | Investment Management | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	4	0
Net interest income	4	0
Operating Segments | Investment Management | Total other income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	0	0
Total other income	0	0
Other
Disaggregation of Revenue [Line Items]
Servicing fees	0	0
Management fees	0	0
Foreign exchange trading services	0	0
Securities finance	0	0
Software and processing fees	0	0
Other fee revenue	0	0
Total fee revenue	0	0
Net interest income	0	0
Total other income	0	0
Total revenue	$ 0	$ 0