Line of Business Information - Summary of Line of Business (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [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
Provision for credit losses	0	(9)
Total expenses	2,327	2,332
Income before income tax expense	$ 754	$ 627
Pre-tax margin	24.00%	21.00%
Operating Segments | Investment Servicing
Segment Reporting Information [Line Items]
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
Provision for credit losses	0	(9)
Total expenses	1,925	1,879
Income before income tax expense	$ 633	$ 574
Pre-tax margin	25.00%	23.00%
Operating Segments | Investment Management
Segment Reporting Information [Line Items]
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
Provision for credit losses	0	0
Total expenses	389	397
Income before income tax expense	$ 134	$ 109
Pre-tax margin	26.00%	21.00%
Other
Segment Reporting Information [Line Items]
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
Provision for credit losses	0	0
Total expenses	13	56
Income before income tax expense	$ (13)	$ (56)