Revenue from Contracts with Customers - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Servicing fees	$ 1,234	$ 1,219	$ 3,710	$ 3,884
Management fees	479	472	1,397	1,482
Foreign exchange trading services	313	319	958	1,009
Securities finance	103	110	329	313
Software and processing fees	188	184	574	573
Other fee revenue	44	(5)	147	(19)
Total fee revenue	2,361	2,299	7,115	7,242
Net interest income	624	660	2,081	1,753
Total other income	(294)	0	(294)	(2)
Total revenue	2,691	2,959	8,902	8,993
Operating Segments | Investment Servicing
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,513	1,505	4,583	4,765
All other revenue	946	971	3,079	2,744
Servicing fees	1,234	1,219	3,710	3,884
Management fees	0	0	0	0
Foreign exchange trading services	278	293	875	948
Securities finance	98	105	310	300
Software and processing fees	188	184	574	573
Other fee revenue	41	12	124	46
Total fee revenue	1,839	1,813	5,593	5,751
Net interest income	620	663	2,069	1,760
Total other income	0	0	0	(2)
Total revenue	2,459	2,476	7,662	7,509
Operating Segments | Investment Servicing | Servicing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,234	1,219	3,710	3,884
All other revenue	0	0	0	0
Servicing fees	1,234	1,219	3,710	3,884
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	84	88	260	279
All other revenue	194	205	615	669
Foreign exchange trading services	278	293	875	948
Operating Segments | Investment Servicing | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	53	60	177	175
All other revenue	45	45	133	125
Securities finance	98	105	310	300
Operating Segments | Investment Servicing | Software and processing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	142	138	436	427
All other revenue	46	46	138	146
Software and processing fees	188	184	574	573
Operating Segments | Investment Servicing | Other fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	41	12	124	46
Other fee revenue	41	12	124	46
Operating Segments | Investment Servicing | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,513	1,505	4,583	4,765
All other revenue	326	308	1,010	986
Total fee revenue	1,839	1,813	5,593	5,751
Operating Segments | Investment Servicing | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	620	663	2,069	1,760
Net interest income	620	663	2,069	1,760
Operating Segments | Investment Servicing | Total other income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	0	0	0	(2)
Total other income	0	0	0	(2)
Operating Segments | Investment Management
Disaggregation of Revenue [Line Items]
Topic 606 revenue	514	498	1,480	1,543
All other revenue	12	(15)	54	(59)
Servicing fees	0	0	0	0
Management fees	479	472	1,397	1,482
Foreign exchange trading services	35	26	83	61
Securities finance	5	5	19	13
Software and processing fees	0	0	0	0
Other fee revenue	3	(17)	23	(65)
Total fee revenue	522	486	1,522	1,491
Net interest income	4	(3)	12	(7)
Total other income	0	0	0	0
Total revenue	526	483	1,534	1,484
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	479	472	1,397	1,482
All other revenue	0	0	0	0
Management fees	479	472	1,397	1,482
Operating Segments | Investment Management | Foreign exchange trading services
Disaggregation of Revenue [Line Items]
Topic 606 revenue	35	26	83	61
All other revenue	0	0	0	0
Foreign exchange trading services	35	26	83	61
Operating Segments | Investment Management | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	5	5	19	13
Securities finance	5	5	19	13
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	(17)	23	(65)
Other fee revenue	3	(17)	23	(65)
Operating Segments | Investment Management | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	514	498	1,480	1,543
All other revenue	8	(12)	42	(52)
Total fee revenue	522	486	1,522	1,491
Operating Segments | Investment Management | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	4	(3)	12	(7)
Net interest income	4	(3)	12	(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	(294)	0	(294)	0
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	(294)	0	(294)	0
Total revenue	(294)	0	(294)	0
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	(294)	0	(294)	0
Total other income	$ (294)	$ 0	$ (294)	$ 0