Loans, Lending Commitments and Related Allowance for Credit Losses - Allowance for Credit Losses Rollforward - Loans and Lending Commitments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Allowance for loan losses rollforward
Beginning balance			$ 654	$ 835
Gross charge-offs			(31)	(107)
Recoveries			7
Net (charge-offs) recoveries			(24)
Provision (release)	$ 6	$ 5	137	(37)
Other			(18)	(7)
Ending balance	$ 749	$ 684	$ 749	$ 684
Percent of loans to total loans	100.00%	100.00%	100.00%	100.00%
Allowance for lending commitments rollforward
Beginning balance			$ 444	$ 396
Provision (release)	$ 29	$ 19	56	36
Other			(13)	(3)
Ending balance	487	429	487	429
Corporate
Allowance for loan losses rollforward
Beginning balance			165	309
Gross charge-offs			0	(19)
Recoveries			6
Net (charge-offs) recoveries			6
Provision (release)			46	(91)
Other			(6)	(2)
Ending balance	$ 211	$ 197	$ 211	$ 197
Percent of loans to total loans	3.00%	3.00%	3.00%	3.00%
Allowance for lending commitments rollforward
Beginning balance			$ 356	$ 323
Provision (release)			64	39
Other			(12)	(3)
Ending balance	$ 408	$ 359	408	359
Secured lending facilities
Allowance for loan losses rollforward
Beginning balance			163	198
Gross charge-offs			(3)	(67)
Recoveries			0
Net (charge-offs) recoveries			(3)
Provision (release)			(2)	47
Other			(2)	(3)
Ending balance	$ 156	$ 175	$ 156	$ 175
Percent of loans to total loans	18.00%	17.00%	18.00%	17.00%
Allowance for lending commitments rollforward
Beginning balance			$ 41	$ 38
Provision (release)			7	2
Other			(1)	1
Ending balance	$ 47	$ 41	47	41
Commercial real estate
Allowance for loan losses rollforward
Beginning balance			206	211
Gross charge-offs			(7)	(21)
Recoveries			0
Net (charge-offs) recoveries			(7)
Provision (release)			35	4
Other			(10)	(1)
Ending balance	$ 224	$ 193	$ 224	$ 193
Percent of loans to total loans	4.00%	4.00%	4.00%	4.00%
Allowance for lending commitments rollforward
Beginning balance			$ 20	$ 11
Provision (release)			(6)	0
Other			0	(1)
Ending balance	$ 14	$ 10	14	10
Residential real estate
Allowance for loan losses rollforward
Beginning balance			60	59
Gross charge-offs			0	0
Recoveries			1
Net (charge-offs) recoveries			1
Provision (release)			26	(2)
Other			0	1
Ending balance	$ 87	$ 58	$ 87	$ 58
Percent of loans to total loans	27.00%	26.00%	27.00%	26.00%
Allowance for lending commitments rollforward
Beginning balance			$ 1	$ 1
Provision (release)			1	0
Other			0	0
Ending balance	$ 2	$ 1	2	1
SBL and Other
Allowance for loan losses rollforward
Beginning balance			60	58
Gross charge-offs			(21)	0
Recoveries			0
Net (charge-offs) recoveries			(21)
Provision (release)			32	5
Other			0	(2)
Ending balance	$ 71	$ 61	$ 71	$ 61
Percent of loans to total loans	48.00%	50.00%	48.00%	50.00%
Allowance for lending commitments rollforward
Beginning balance			$ 26	$ 23
Provision (release)			(10)	(5)
Other			0	0
Ending balance	$ 16	$ 18	$ 16	$ 18