Line of Business Information - Summary of Line of Business (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Servicing fees	$ 1,219	$ 1,391	$ 3,884	$ 4,154
Management fees	472	526	1,482	1,523
Foreign exchange trading services	319	279	1,009	911
Securities finance	110	106	313	314
Software and processing fees	184	180	573	551
Other fee revenue	(5)	22	(19)	48
Total fee revenue	2,299	2,504	7,242	7,501
Net interest income	660	487	1,753	1,421
Total other income	0	(1)	(2)	52
Total revenue	2,959	2,990	8,993	8,974
Provision for credit losses	0	(2)	10	(26)
Total expenses	2,110	2,116	6,545	6,559
Income before income tax expense	$ 849	$ 876	$ 2,438	$ 2,441
Pre-tax margin	29.00%	29.00%	27.00%	27.00%
Operating Segments | Investment Servicing
Segment Reporting Information [Line Items]
Servicing fees	$ 1,219	$ 1,391	$ 3,884	$ 4,154
Management fees	0	0	0	0
Foreign exchange trading services	293	266	948	869
Securities finance	105	103	300	304
Software and processing fees	184	180	573	551
Other fee revenue	12	28	46	45
Total fee revenue	1,813	1,968	5,751	5,923
Net interest income	663	491	1,760	1,432
Total other income	0	(1)	(2)	(1)
Total revenue	2,476	2,458	7,509	7,354
Provision for credit losses	0	(2)	10	(26)
Total expenses	1,760	1,755	5,452	5,389
Income before income tax expense	$ 716	$ 705	$ 2,047	$ 1,991
Pre-tax margin	29.00%	29.00%	27.00%	27.00%
Operating Segments | Investment Management
Segment Reporting Information [Line Items]
Servicing fees	$ 0	$ 0	$ 0	$ 0
Management fees	472	526	1,482	1,523
Foreign exchange trading services	26	13	61	42
Securities finance	5	3	13	10
Software and processing fees	0	0	0	0
Other fee revenue	(17)	(6)	(65)	3
Total fee revenue	486	536	1,491	1,578
Net interest income	(3)	(4)	(7)	(11)
Total other income	0	0	0	0
Total revenue	483	532	1,484	1,567
Provision for credit losses	0	0	0	0
Total expenses	335	339	1,051	1,082
Income before income tax expense	$ 148	$ 193	$ 433	$ 485
Pre-tax margin	31.00%	36.00%	29.00%	31.00%
Other
Segment Reporting Information [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	53
Total revenue	0	0	0	53
Provision for credit losses	0	0	0	0
Total expenses	15	22	42	88
Income before income tax expense	$ (15)	$ (22)	$ (42)	$ (35)