Revenue from Contracts with Customers - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Servicing fees	$ 1,368	$ 1,369
Management fees	520	493
Foreign exchange trading services	359	346
Securities finance	96	99
Software and processing fees	201	160
Other fee revenue	29	16
Total fee revenue	2,573	2,483
Net interest income	509	467
Total other income (loss)	(1)	0
Total revenue	3,081	2,950
Operating Segments | Investment Servicing
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,674	1,634
All other revenue	884	810
Servicing fees	1,368	1,369
Management fees	0	0
Foreign exchange trading services	342	333
Securities finance	93	95
Software and processing fees	201	160
Other fee revenue	46	14
Total fee revenue	2,050	1,971
Net interest income	509	473
Total other income (loss)	(1)	0
Total revenue	2,558	2,444
Operating Segments | Investment Servicing | Servicing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,368	1,369
All other revenue	0	0
Servicing fees	1,368	1,369
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	101	95
All other revenue	241	238
Foreign exchange trading services	342	333
Operating Segments | Investment Servicing | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	54	60
All other revenue	39	35
Securities finance	93	95
Operating Segments | Investment Servicing | Software and processing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	151	110
All other revenue	50	50
Software and processing fees	201	160
Operating Segments | Investment Servicing | Other fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	46	14
Other fee revenue	46	14
Operating Segments | Investment Servicing | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,674	1,634
All other revenue	376	337
Total fee revenue	2,050	1,971
Operating Segments | Investment Servicing | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	509	473
Net interest income	509	473
Operating Segments | Investment Servicing | Total other income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	(1)	0
Total other income (loss)	(1)	0
Operating Segments | Investment Management
Disaggregation of Revenue [Line Items]
Topic 606 revenue	537	506
All other revenue	(14)	0
Servicing fees	0	0
Management fees	520	493
Foreign exchange trading services	17	13
Securities finance	3	4
Software and processing fees	0	0
Other fee revenue	(17)	2
Total fee revenue	523	512
Net interest income	0	(6)
Total other income (loss)	0	0
Total revenue	523	506
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	520	493
All other revenue	0	0
Management fees	520	493
Operating Segments | Investment Management | Foreign exchange trading services
Disaggregation of Revenue [Line Items]
Topic 606 revenue	17	13
All other revenue	0	0
Foreign exchange trading services	17	13
Operating Segments | Investment Management | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	3	4
Securities finance	3	4
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)	2
Other fee revenue	(17)	2
Operating Segments | Investment Management | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	537	506
All other revenue	(14)	6
Total fee revenue	523	512
Operating Segments | Investment Management | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	0	(6)
Net interest income	0	(6)
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 (loss)	0	0
Other
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	0	0
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 (loss)	0	0
Total revenue	0	0
Other | Servicing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	0	0
Servicing fees	0	0
Other | Management fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	0	0
Management fees	0	0
Other | Foreign exchange trading services
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	0	0
Foreign exchange trading services	0	0
Other | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	0	0
Securities finance	0	0
Other | 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
Other | Other fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	0	0
Other fee revenue	0	0
Other | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	0	0
Total fee revenue	0	0
Other | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	0	0
Net interest income	0	0
Other | Total other income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0
All other revenue	0	0
Total other income (loss)	$ 0	$ 0