Line of Business Information - Summary of Line of Business (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [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
Provision for credit losses	10	(15)	10	(24)
Total expenses	2,108	2,111	4,435	4,443
Income before income tax expense	$ 835	$ 938	$ 1,589	$ 1,565
Pre-tax margin	28.00%	31.00%	26.00%	26.00%
Operating Segments | Investment Servicing
Segment Reporting Information [Line Items]
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
Provision for credit losses	10	(15)	10	(24)
Total expenses	1,767	1,755	3,692	3,634
Income before income tax expense	$ 698	$ 712	$ 1,331	$ 1,286
Pre-tax margin	28.00%	29.00%	26.00%	26.00%
Operating Segments | Investment Management
Segment Reporting Information [Line Items]
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
Provision for credit losses	0	0	0	0
Total expenses	327	346	716	743
Income before income tax expense	$ 151	$ 183	$ 285	$ 292
Pre-tax margin	32.00%	35.00%	28.00%	28.00%
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	53	0	53
Total revenue	0	53	0	53
Provision for credit losses	0	0	0	0
Total expenses	14	10	27	66
Income before income tax expense	$ (14)	$ 43	$ (27)	$ (13)