Revenue from Contracts with Customers - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Servicing fees	$ 1,297	$ 1,394	$ 2,665	$ 2,763
Management fees	490	504	1,010	997
Foreign exchange trading services	331	286	690	632
Securities finance	107	109	203	208
Software and processing fees	188	211	389	371
Other fee revenue	(43)	10	(14)	26
Total fee revenue	2,370	2,514	4,943	4,997
Net interest income	584	467	1,093	934
Total other income	(1)	53	(2)	53
Total revenue	2,953	3,034	6,034	5,984
Operating Segments | Investment Servicing
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,586	1,699	3,260	3,333
All other revenue	889	753	1,773	1,563
Servicing fees	1,297	1,394	2,665	2,763
Management fees	0	0	0	0
Foreign exchange trading services	313	270	655	603
Securities finance	102	106	195	201
Software and processing fees	188	211	389	371
Other fee revenue	(12)	3	34	17
Total fee revenue	1,888	1,984	3,938	3,955
Net interest income	588	468	1,097	941
Total other income	(1)	0	(2)	0
Total revenue	2,475	2,452	5,033	4,896
Operating Segments | Investment Servicing | Servicing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,297	1,394	2,665	2,763
All other revenue	0	0	0	0
Servicing fees	1,297	1,394	2,665	2,763
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	90	83	191	178
All other revenue	223	187	464	425
Foreign exchange trading services	313	270	655	603
Operating Segments | Investment Servicing | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	61	61	115	121
All other revenue	41	45	80	80
Securities finance	102	106	195	201
Operating Segments | Investment Servicing | Software and processing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	138	161	289	271
All other revenue	50	50	100	100
Software and processing fees	188	211	389	371
Operating Segments | Investment Servicing | Other fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	(12)	3	34	17
Other fee revenue	(12)	3	34	17
Operating Segments | Investment Servicing | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,586	1,699	3,260	3,333
All other revenue	302	285	678	622
Total fee revenue	1,888	1,984	3,938	3,955
Operating Segments | Investment Servicing | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	588	468	1,097	941
Net interest income	588	468	1,097	941
Operating Segments | Investment Servicing | Total other income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	(1)	0	(2)	0
Total other income	(1)	0	(2)	0
Operating Segments | Investment Management
Disaggregation of Revenue [Line Items]
Topic 606 revenue	508	520	1,045	1,026
All other revenue	(30)	9	(44)	9
Servicing fees	0	0	0	0
Management fees	490	504	1,010	997
Foreign exchange trading services	18	16	35	29
Securities finance	5	3	8	7
Software and processing fees	0	0	0	0
Other fee revenue	(31)	7	(48)	9
Total fee revenue	482	530	1,005	1,042
Net interest income	(4)	(1)	(4)	(7)
Total other income	0	0	0	0
Total revenue	478	529	1,001	1,035
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	490	504	1,010	997
All other revenue	0	0	0	0
Management fees	490	504	1,010	997
Operating Segments | Investment Management | Foreign exchange trading services
Disaggregation of Revenue [Line Items]
Topic 606 revenue	18	16	35	29
All other revenue	0	0	0	0
Foreign exchange trading services	18	16	35	29
Operating Segments | Investment Management | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	5	3	8	7
Securities finance	5	3	8	7
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
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	(31)	7	(48)	9
Other fee revenue	(31)	7	(48)	9
Operating Segments | Investment Management | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	508	520	1,045	1,026
All other revenue	(26)	10	(40)	16
Total fee revenue	482	530	1,005	1,042
Operating Segments | Investment Management | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	(4)	(1)	(4)	(7)
Net interest income	(4)	(1)	(4)	(7)
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]
Topic 606 revenue	0	0	0	0
All other revenue	0	53	0	53
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	53	0	53
Total revenue	0	53	0	53
Other | 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
Other | 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
Other | Foreign exchange trading services
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	0	0	0	0
Foreign exchange trading services	0	0	0	0
Other | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	0	0	0	0
Securities finance	0	0	0	0
Other | 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
Other | Other fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	0	0	0	0
Other fee revenue	0	0	0	0
Other | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	0	0	0	0
Total fee revenue	0	0	0	0
Other | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	0	0	0	0
Net interest income	0	0	0	0
Other | Total other income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	0	53	0	53
Total other income	$ 0	$ 53	$ 0	$ 53