ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Credit Losses for Other Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year	$ 123	$ 53	$ 55
Gross credit losses	(97)	(24)	(2)
Gross recoveries	25	3	0
Net credit losses (NCLs)	(72)	(21)	(2)
Net reserve builds (releases)	1,690	55	(2)
Total provision for credit losses	1,762	76	0
Other, net	(25)	15	0
Allowance for credit losses on other assets at end of year	1,788	123	53
Transferred in		30
Deposits with banks
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year	51	21	20
Gross credit losses	0	0	0
Gross recoveries	0	0	0
Net credit losses (NCLs)	0	0	0
Net reserve builds (releases)	(19)	30	2
Total provision for credit losses	(19)	30	2
Other, net	(1)	0	(1)
Allowance for credit losses on other assets at end of year	31	51	21
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 year	36	6	10
Gross credit losses	0	0	0
Gross recoveries	0	0	0
Net credit losses (NCLs)	0	0	0
Net reserve builds (releases)	14	14	(4)
Total provision for credit losses	14	14	(4)
Other, net	(23)	16	0
Allowance for credit losses on other assets at end of year	27	36	6
All other assets
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year	36	26	25
Gross credit losses	(97)	(24)	(2)
Gross recoveries	25	3	0
Net credit losses (NCLs)	(72)	(21)	(2)
Net reserve builds (releases)	1,695	11	0
Total provision for credit losses	1,767	32	2
Other, net	(1)	(1)	1
Allowance for credit losses on other assets at end of year	$ 1,730	$ 36	$ 26