Contract revenue - Disaggregation of Contract Revenues (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Total fee and other revenue	$ 3,353	$ 3,430	$ 3,394	$ 10,011	$ 9,975
Net income (loss) attributable to noncontrolling interests	0	(5)	(4)	(13)	6
Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	3,020	3,101	3,051	9,067	9,049
Fee and other revenue - not in scope of ASC 606	333	334	347	957	920
Total fee and other revenue	3,353	3,435	3,398	10,024	9,969
Investment services fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	2,146	2,199	2,079	6,329	6,183
Investment management and performance fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	802	826	900	2,515	2,652
Financing-related fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	11	15	16	43	52
Distribution and servicing | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	33	34	28	97	84
Investment and other income | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	28	27	28	83	78
Securities Services | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	1,297	1,360	1,300	3,838	3,802
Fee and other revenue - not in scope of ASC 606	239	189	188	650	550
Total fee and other revenue	1,536	1,549	1,488	4,488	4,352
Securities Services | Investment services fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	1,233	1,294	1,260	3,657	3,685
Securities Services | Investment management and performance fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	0	0	0	0	0
Securities Services | Financing-related fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	7	11	4	21	13
Securities Services | Distribution and servicing | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	1	1	1	3	4
Securities Services | Investment and other income | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	56	54	35	157	100
Market and Wealth Services | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	937	929	828	2,737	2,528
Fee and other revenue - not in scope of ASC 606	52	45	62	132	179
Total fee and other revenue	989	974	890	2,869	2,707
Market and Wealth Services | Investment services fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	903	898	810	2,647	2,474
Market and Wealth Services | Investment management and performance fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	5	6	5	17	13
Market and Wealth Services | Financing-related fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	3	4	12	21	39
Market and Wealth Services | Distribution and servicing | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	(23)	(17)	(2)	(44)	(4)
Market and Wealth Services | Investment and other income | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	49	38	3	96	6
Investment and Wealth Management | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	805	831	945	2,553	2,785
Fee and other revenue - not in scope of ASC 606	0	6	40	(4)	95
Total fee and other revenue	805	837	985	2,549	2,880
Net income (loss) attributable to noncontrolling interests	0	(5)	(4)	(13)	6
Investment and Wealth Management | Investment services fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	26	24	26	75	75
Investment and Wealth Management | Investment management and performance fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	800	822	901	2,509	2,654
Investment and Wealth Management | Financing-related fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	0	0	0	0	0
Investment and Wealth Management | Distribution and servicing | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	55	51	28	138	84
Investment and Wealth Management | Investment and other income | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	(76)	(66)	(10)	(169)	(28)
Other | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	(19)	(19)	(22)	(61)	(66)
Fee and other revenue - not in scope of ASC 606	42	94	57	179	96
Total fee and other revenue	23	75	35	118	30
Other | Investment services fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	(16)	(17)	(17)	(50)	(51)
Other | Investment management and performance fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	(3)	(2)	(6)	(11)	(15)
Other | Financing-related fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	1	0	0	1	0
Other | Distribution and servicing | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	0	(1)	1	0	0
Other | Investment and other income | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	$ (1)	$ 1	$ 0	$ (1)	$ 0