Contract revenue - Disaggregation of Contract Revenues (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total fee and other revenue	$ 3,430	$ 3,228	$ 3,315	$ 6,658	$ 6,581
Net income (loss) attributable to noncontrolling interests	(5)	(8)	5	(13)	10
Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	3,101	2,946	3,000	6,047	5,998
Fee and other revenue - not in scope of ASC 606	334	290	310	624	573
Total fee and other revenue	3,435	3,236	3,310	6,671	6,571
Investment services fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	2,199	1,984	2,062	4,183	4,104
Investment management and performance fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	826	887	870	1,713	1,752
Financing-related fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	15	17	16	32	36
Distribution and servicing | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	34	30	27	64	56
Investment and other income | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	27	28	25	55	50
Securities Services | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	1,360	1,181	1,275	2,541	2,502
Fee and other revenue - not in scope of ASC 606	189	222	158	411	362
Total fee and other revenue	1,549	1,403	1,433	2,952	2,864
Securities Services | Investment services fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	1,294	1,130	1,238	2,424	2,425
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	11	3	4	14	9
Securities Services | Distribution and servicing | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	1	1	1	2	3
Securities Services | Investment and other income | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	54	47	32	101	65
Market and Wealth Services | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	929	871	832	1,800	1,700
Fee and other revenue - not in scope of ASC 606	45	35	71	80	117
Total fee and other revenue	974	906	903	1,880	1,817
Market and Wealth Services | Investment services fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	898	846	817	1,744	1,664
Market and Wealth Services | Investment management and performance fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	6	6	4	12	8
Market and Wealth Services | Financing-related fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	4	14	12	18	27
Market and Wealth Services | Distribution and servicing | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	(17)	(4)	(1)	(21)	(2)
Market and Wealth Services | Investment and other income | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	38	9	0	47	3
Investment and Wealth Management | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	831	917	915	1,748	1,840
Fee and other revenue - not in scope of ASC 606	6	(10)	37	(4)	55
Total fee and other revenue	837	907	952	1,744	1,895
Net income (loss) attributable to noncontrolling interests	(5)	(8)	5	(13)	10
Investment and Wealth Management | Investment services fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	24	25	24	49	49
Investment and Wealth Management | Investment management and performance fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	822	887	870	1,709	1,753
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	51	32	28	83	56
Investment and Wealth Management | Investment and other income | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	(66)	(27)	(7)	(93)	(18)
Other | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	(19)	(23)	(22)	(42)	(44)
Fee and other revenue - not in scope of ASC 606	94	43	44	137	39
Total fee and other revenue	75	20	22	95	(5)
Other | Investment services fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	(17)	(17)	(17)	(34)	(34)
Other | Investment management and performance fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	(2)	(6)	(4)	(8)	(9)
Other | Financing-related fees | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	0	0	0	0	0
Other | Distribution and servicing | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	(1)	1	(1)	0	(1)
Other | Investment and other income | Operating segments
Disaggregation of Revenue [Line Items]
Total fee revenue and other revenue - contract revenue	$ 1	$ (1)	$ 0	$ 0	$ 0