Revenue from Contracts with Customers - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Servicing fees	$ 1,259	$ 1,297	$ 2,476	$ 2,665
Management fees	461	490	918	1,010
Foreign exchange trading services	303	331	645	690
Securities finance	117	107	226	203
Software and processing fees	221	188	386	389
Other fee revenue	58	(43)	103	(14)
Total fee revenue	2,419	2,370	4,754	4,943
Net interest income	691	584	1,457	1,093
Total other income	0	(1)	0	(2)
Total revenue	3,110	2,953	6,211	6,034
Operating Segments | Investment Servicing
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,580	1,586	3,070	3,260
All other revenue	1,027	889	2,133	1,773
Servicing fees	1,259	1,297	2,476	2,665
Management fees	0	0	0	0
Foreign exchange trading services	276	313	597	655
Securities finance	109	102	212	195
Software and processing fees	221	188	386	389
Other fee revenue	55	(12)	83	34
Total fee revenue	1,920	1,888	3,754	3,938
Net interest income	687	588	1,449	1,097
Total other income	0	(1)	0	(2)
Total revenue	2,607	2,475	5,203	5,033
Operating Segments | Investment Servicing | Servicing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,259	1,297	2,476	2,665
All other revenue	0	0	0	0
Servicing fees	1,259	1,297	2,476	2,665
Operating Segments | Investment Servicing | Management fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	0	0	0	0
Management fees	0	0	0	0
Operating Segments | Investment Servicing | Foreign exchange trading services
Disaggregation of Revenue [Line Items]
Topic 606 revenue	86	90	176	191
All other revenue	190	223	421	464
Foreign exchange trading services	276	313	597	655
Operating Segments | Investment Servicing | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	61	61	124	115
All other revenue	48	41	88	80
Securities finance	109	102	212	195
Operating Segments | Investment Servicing | Software and processing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	174	138	294	289
All other revenue	47	50	92	100
Software and processing fees	221	188	386	389
Operating Segments | Investment Servicing | Other fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	55	(12)	83	34
Other fee revenue	55	(12)	83	34
Operating Segments | Investment Servicing | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,580	1,586	3,070	3,260
All other revenue	340	302	684	678
Total fee revenue	1,920	1,888	3,754	3,938
Operating Segments | Investment Servicing | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	687	588	1,449	1,097
Net interest income	687	588	1,449	1,097
Operating Segments | Investment Servicing | Total other income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	0	(1)	0	(2)
Total other income	0	(1)	0	(2)
Operating Segments | Investment Management
Disaggregation of Revenue [Line Items]
Topic 606 revenue	488	508	966	1,045
All other revenue	15	(30)	42	(44)
Servicing fees	0	0	0	0
Management fees	461	490	918	1,010
Foreign exchange trading services	27	18	48	35
Securities finance	8	5	14	8
Software and processing fees	0	0	0	0
Other fee revenue	3	(31)	20	(48)
Total fee revenue	499	482	1,000	1,005
Net interest income	4	(4)	8	(4)
Total other income	0	0	0	0
Total revenue	503	478	1,008	1,001
Operating Segments | Investment Management | Servicing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	0	0	0	0
Servicing fees	0	0	0	0
Operating Segments | Investment Management | Management fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	461	490	918	1,010
All other revenue	0	0	0	0
Management fees	461	490	918	1,010
Operating Segments | Investment Management | Foreign exchange trading services
Disaggregation of Revenue [Line Items]
Topic 606 revenue	27	18	48	35
All other revenue	0	0	0	0
Foreign exchange trading services	27	18	48	35
Operating Segments | Investment Management | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	8	5	14	8
Securities finance	8	5	14	8
Operating Segments | Investment Management | Software and processing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	0	0	0	0
Software and processing fees	0	0	0	0
Operating Segments | Investment Management | Other fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	3	(31)	20	(48)
Other fee revenue	3	(31)	20	(48)
Operating Segments | Investment Management | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	488	508	966	1,045
All other revenue	11	(26)	34	(40)
Total fee revenue	499	482	1,000	1,005
Operating Segments | Investment Management | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	4	(4)	8	(4)
Net interest income	4	(4)	8	(4)
Operating Segments | Investment Management | Total other income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	0	0	0	0
Total other income	0	0	0	0
Other
Disaggregation of Revenue [Line Items]
Servicing fees	0	0	0	0
Management fees	0	0	0	0
Foreign exchange trading services	0	0	0	0
Securities finance	0	0	0	0
Software and processing fees	0	0	0	0
Other fee revenue	0	0		0
Total fee revenue	0	0	0	0
Net interest income	0	0	0	0
Total other income	0	0	0	0
Total revenue	$ 0	$ 0	$ 0	$ 0