ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Credit Losses for Other Assets (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year		$ 1,788	$ 123	$ 53
Gross credit losses		(53)	(97)	(24)
Gross recoveries		27	25	3
Net credit losses (NCLs)		(26)	(72)	(21)
Net reserve builds (releases)		336	1,690	55
Total provision for credit losses		362	1,762	76
Other, net(2)		(259)	(25)	15
Allowance for credit losses on other assets at end of year		1,865	1,788	123
Transferred in	$ 30	52	26
Deposits with banks
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year		31	51	21
Gross credit losses		0	0	0
Gross recoveries		0	0	0
Net credit losses (NCLs)		0	0	0
Net reserve builds (releases)		(7)	(19)	30
Total provision for credit losses		(7)	(19)	30
Other, net(2)		1	(1)	0
Allowance for credit losses on other assets at end of year		25	31	51
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		27	36	6
Gross credit losses		0	0	0
Gross recoveries		0	0	0
Net credit losses (NCLs)		0	0	0
Net reserve builds (releases)		(23)	14	14
Total provision for credit losses		(23)	14	14
Other, net(2)		(1)	(23)	16
Allowance for credit losses on other assets at end of year		3	27	36
All other assets
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]
Allowance for credit losses on other assets at beginning of year		1,730	36	26
Gross credit losses		(53)	(97)	(24)
Gross recoveries		27	25	3
Net credit losses (NCLs)		(26)	(72)	(21)
Net reserve builds (releases)		366	1,695	11
Total provision for credit losses		392	1,767	32
Other, net(2)		(259)	(1)	(1)
Allowance for credit losses on other assets at end of year		$ 1,837	$ 1,730	$ 36