ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Credit Losses for Other Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of quarter	$ 123	$ 53
Gross credit losses	(11)	(7)
Gross recoveries	0	0
Net credit losses (NCLs)	(11)	(7)
Net reserve builds (releases)	414	(11)
Total provision for credit losses	425	(4)
Other, net	(9)	1
Allowance for credit losses on other assets at end of quarter	528	43
Deposits with banks
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of quarter	51	21
Gross credit losses	0	0
Gross recoveries	0	0
Net credit losses (NCLs)	0	0
Net reserve builds (releases)	85	(6)
Total provision for credit losses	85	(6)
Other, net	(1)	0
Allowance for credit losses on other assets at end of quarter	135	15
Securities borrowed and 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 quarter	36	6
Gross credit losses	0	0
Gross recoveries	0	0
Net credit losses (NCLs)	0	0
Net reserve builds (releases)	(3)	(2)
Total provision for credit losses	(3)	(2)
Other, net	(3)	0
Allowance for credit losses on other assets at end of quarter	30	4
Brokerage receivables
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of quarter	0	0
Gross credit losses	0	0
Gross recoveries	0	0
Net credit losses (NCLs)	0	0
Net reserve builds (releases)	0	0
Total provision for credit losses	0	0
Other, net	0	0
Allowance for credit losses on other assets at end of quarter	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 quarter	36	26
Gross credit losses	(11)	(7)
Gross recoveries	0	0
Net credit losses (NCLs)	(11)	(7)
Net reserve builds (releases)	332	(3)
Total provision for credit losses	343	4
Other, net	(5)	1
Allowance for credit losses on other assets at end of quarter	$ 363	$ 24