ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Credit Losses for Other Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year	$ 53	$ 55	$ 0
Gross credit losses	(24)	(2)	0
Gross recoveries	3	0	0
Net credit losses (NCLs)	(21)	(2)	0
Net reserve builds (releases)	55	(2)	7
Total provision for credit losses	76	0	7
Other, net	15	0	22
Allowance for credit losses on other assets at end of year	123	53	55
Transferred in	30
Cash and due from banks
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year		0	0
Gross credit losses			0
Gross recoveries			0
Net credit losses (NCLs)			0
Net reserve builds (releases)			(6)
Total provision for credit losses			(6)
Other, net			0
Allowance for credit losses on other assets at end of year			0
Deposits with banks
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year	21	20	0
Gross credit losses	0	0	0
Gross recoveries	0	0	0
Net credit losses (NCLs)	0	0	0
Net reserve builds (releases)	30	2	5
Total provision for credit losses	30	2	5
Other, net	0	(1)	1
Allowance for credit losses on other assets at end of year	51	21	20
Securities borrowed or purchased under agreements to resell
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year	6	10	0
Gross credit losses	0	0	0
Gross recoveries	0	0	0
Net credit losses (NCLs)	0	0	0
Net reserve builds (releases)	14	(4)	8
Total provision for credit losses	14	(4)	8
Other, net	16	0	0
Allowance for credit losses on other assets at end of year	36	6	10
Brokerage receivables
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year	0	0	0
Gross credit losses	0	0	0
Gross recoveries	0	0	0
Net credit losses (NCLs)	0	0	0
Net reserve builds (releases)	0	0	(1)
Total provision for credit losses	0	0	(1)
Other, net	0	0	0
Allowance for credit losses on other assets at end of year	0	0	0
All other assets
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year	26	25	0
Gross credit losses	(24)	(2)	0
Gross recoveries	3	0	0
Net credit losses (NCLs)	(21)	(2)	0
Net reserve builds (releases)	11	0	1
Total provision for credit losses	32	2	1
Other, net	(1)	1	21
Allowance for credit losses on other assets at end of year	$ 36	$ 26	25
Cumulative effect of adoption
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year			26
Cumulative effect of adoption | Cash and due from banks
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year			6
Cumulative effect of adoption | Deposits with banks
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year			14
Cumulative effect of adoption | Securities borrowed or purchased under agreements to resell
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year			2
Cumulative effect of adoption | Brokerage receivables
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year			1
Cumulative effect of adoption | All other assets
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year			$ 3