ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Credit Losses for Other Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of quarter	$ 528	$ 43	$ 123	$ 53
Gross credit losses	(24)	(8)	(35)	(15)
Gross recoveries	5	2	5	2
Net credit losses (NCLs)	(19)	(6)	(30)	(13)
Net reserve builds (releases)	130	1	544	(10)
Total provision for credit losses	149	7	574	3
Other, net	1	30	(8)	31
Allowance for credit losses on other assets at end of quarter	659	74	659	74
Deposits with banks
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of quarter	135	15	51	21
Gross credit losses	0	0	0	0
Gross recoveries	0	0	0	0
Net credit losses (NCLs)	0	0	0	0
Net reserve builds (releases)	(114)	2	(29)	(4)
Total provision for credit losses	(114)	2	(29)	(4)
Other, net	0	0	(1)	0
Allowance for credit losses on other assets at end of quarter	21	17	21	17
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	30	4	36	6
Gross credit losses	0	0	0	0
Gross recoveries	0	0	0	0
Net credit losses (NCLs)	0	0	0	0
Net reserve builds (releases)	0	(8)	(3)	(10)
Total provision for credit losses	0	(8)	(3)	(10)
Other, net	(4)	31	(7)	31
Allowance for credit losses on other assets at end of quarter	26	27	26	27
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	363	24	36	26
Gross credit losses	(24)	(8)	(35)	(15)
Gross recoveries	5	2	5	2
Net credit losses (NCLs)	(19)	(6)	(30)	(13)
Net reserve builds (releases)	244	7	576	4
Total provision for credit losses	263	13	606	17
Other, net	5	(1)	0	0
Allowance for credit losses on other assets at end of quarter	$ 612	$ 30	$ 612	$ 30