Revenue from Contracts with Customers - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Servicing fees	$ 1,266	$ 1,234	$ 3,733	$ 3,710
Management fees	527	479	1,548	1,397
Foreign exchange trading services	374	313	1,041	958
Securities finance	116	103	320	329
Software and processing fees	208	188	629	574
Other fee revenue	125	44	223	147
Total fee revenue	2,616	2,361	7,494	7,115
Net interest income	723	624	2,174	2,081
Total other income (loss)	(80)	(294)	(80)	(294)
Total revenue	3,259	2,691	9,588	8,902
Operating Segments | Investment Servicing
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,566	1,513	4,634	4,583
All other revenue	1,096	946	3,239	3,079
Servicing fees	1,266	1,234	3,733	3,710
Management fees	0	0	0	0
Foreign exchange trading services	312	278	924	875
Securities finance	111	98	302	310
Software and processing fees	208	188	629	574
Other fee revenue	48	41	127	124
Total fee revenue	1,945	1,839	5,715	5,593
Net interest income	716	620	2,157	2,069
Total other income (loss)	1	0	1	0
Total revenue	2,662	2,459	7,873	7,662
Operating Segments | Investment Servicing | Servicing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,266	1,234	3,733	3,710
All other revenue	0	0	0	0
Servicing fees	1,266	1,234	3,733	3,710
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	96	84	286	260
All other revenue	216	194	638	615
Foreign exchange trading services	312	278	924	875
Operating Segments | Investment Servicing | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	45	53	139	177
All other revenue	66	45	163	133
Securities finance	111	98	302	310
Operating Segments | Investment Servicing | Software and processing fees
Disaggregation of Revenue [Line Items]
Topic 606 revenue	159	142	476	436
All other revenue	49	46	153	138
Software and processing fees	208	188	629	574
Operating Segments | Investment Servicing | Other fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	48	41	127	124
Other fee revenue	48	41	127	124
Operating Segments | Investment Servicing | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	1,566	1,513	4,634	4,583
All other revenue	379	326	1,081	1,010
Total fee revenue	1,945	1,839	5,715	5,593
Operating Segments | Investment Servicing | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	716	620	2,157	2,069
Net interest income	716	620	2,157	2,069
Operating Segments | Investment Servicing | Total other income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	1	0	1	0
Total other income (loss)	1	0	1	0
Operating Segments | Investment Management
Disaggregation of Revenue [Line Items]
Topic 606 revenue	574	514	1,650	1,480
All other revenue	23	12	65	54
Servicing fees	0	0	0	0
Management fees	527	479	1,548	1,397
Foreign exchange trading services	47	35	102	83
Securities finance	5	5	18	19
Software and processing fees	0	0	0	0
Other fee revenue	11	3	30	23
Total fee revenue	590	522	1,698	1,522
Net interest income	7	4	17	12
Total other income (loss)	0	0	0	0
Total revenue	597	526	1,715	1,534
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	527	479	1,548	1,397
All other revenue	0	0	0	0
Management fees	527	479	1,548	1,397
Operating Segments | Investment Management | Foreign exchange trading services
Disaggregation of Revenue [Line Items]
Topic 606 revenue	47	35	102	83
All other revenue	0	0	0	0
Foreign exchange trading services	47	35	102	83
Operating Segments | Investment Management | Securities finance
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	5	5	18	19
Securities finance	5	5	18	19
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	11	3	30	23
Other fee revenue	11	3	30	23
Operating Segments | Investment Management | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	574	514	1,650	1,480
All other revenue	16	8	48	42
Total fee revenue	590	522	1,698	1,522
Operating Segments | Investment Management | Net interest income
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	7	4	17	12
Net interest income	7	4	17	12
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 (loss)	0	0	0	0
Other
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	0	(294)	0	(294)
Servicing fees	0	0	0	0
Management fees	0	0	0	0
Foreign exchange trading services	15	0	15	0
Securities finance	0	0	0	0
Software and processing fees	0	0	0	0
Other fee revenue	66	0	66	0
Total fee revenue	81	0	81	0
Net interest income	0	0	0	0
Total other income (loss)	(81)	(294)	(81)	(294)
Total revenue	0	(294)	0	(294)
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	15	0	15	0
Foreign exchange trading services	15	0	15	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	66	0	66	0
Other fee revenue	66	0	66	0
Other | Total fee revenue
Disaggregation of Revenue [Line Items]
Topic 606 revenue	0	0	0	0
All other revenue	81	0	81	0
Total fee revenue	81	0	81	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	(81)	(294)	(81)	(294)
Total other income (loss)	$ (81)	$ (294)	$ (81)	$ (294)