Line of Business Information - Summary of Line of Business (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Servicing fees	$ 5,074	$ 5,421	$ 5,365
Management fees	1,771	1,851	1,616
Foreign exchange trading services	1,111	1,201	1,071
Securities finance	471	543	606
Software and processing fees	720	438	343
Total fee revenue	9,147	9,454	9,001
Net interest income	2,566	2,671	2,304
Total other income	43	6	(39)
Total revenue	11,756	12,131	11,266
Provision for loan losses	10	15	2
Total expenses	9,034	9,015	8,269
Income before income taxes	$ 2,712	$ 3,101	$ 2,995
Pre-tax margin	23.00%	26.00%	27.00%
Average assets (in billions)	$ 223,300	$ 223,400	$ 219,400
Operating Segments | Investment Servicing
Segment Reporting Information [Line Items]
Servicing fees	5,074	5,429	5,365
Management fees	0	0	0
Foreign exchange trading services	974	1,071	999
Securities finance	462	543	606
Software and processing fees	691	443	336
Total fee revenue	7,201	7,486	7,306
Net interest income	2,590	2,691	2,309
Total other income	43	6	(39)
Total revenue	9,834	10,183	9,576
Provision for loan losses	10	15	2
Total expenses	7,140	7,081	6,717
Income before income taxes	$ 2,684	$ 3,087	$ 2,857
Pre-tax margin	27.00%	30.00%	30.00%
Average assets (in billions)	$ 220,300	$ 220,200	$ 214,000
Operating Segments | Investment Management
Segment Reporting Information [Line Items]
Servicing fees	0	0	0
Management fees	1,771	1,851	1,616
Foreign exchange trading services	137	130	72
Securities finance	9	0	0
Software and processing fees	29	(5)	7
Total fee revenue	1,946	1,976	1,695
Net interest income	(24)	(20)	(5)
Total other income	0	0	0
Total revenue	1,922	1,956	1,690
Provision for loan losses	0	0	0
Total expenses	1,535	1,544	1,286
Income before income taxes	$ 387	$ 412	$ 404
Pre-tax margin	20.00%	21.00%	24.00%
Average assets (in billions)	$ 3,000	$ 3,200	$ 5,400
Other
Segment Reporting Information [Line Items]
Servicing fees	0	(8)	0
Management fees	0	0	0
Foreign exchange trading services	0	0	0
Securities finance	0	0	0
Software and processing fees	0	0	0
Total fee revenue	0	(8)	0
Net interest income	0	0	0
Total other income	0	0	0
Total revenue	0	(8)	0
Provision for loan losses	0	0	0
Total expenses	359	390	266
Income before income taxes	$ (359)	$ (398)	$ (266)