SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Servicing Rights (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
MSR fees
Servicing fees, location	Commissions and fees	Commissions and fees	Commissions and fees
Mortgage servicing rights
Classification of Securitizations
Fair value of capitalized mortgage servicing rights	$ 665	$ 404
Principal amount of loans and other financial instruments	51,000	47,000
Capitalized MSRs
Balance at beginning of period	404	336
Originations	120	92
Changes in fair value of MSRs due to changes in inputs and assumptions	201	43
Other changes	(60)	(67)
Sale of MSRs	0	0
Balance at end of period	665	404	$ 336
MSR fees
Servicing fees	122	131	142
Late fees	4	3	5
Total MSR fees	126	134	$ 147
Mortgage-backed securities - U.S. agency-sponsored
Re-securitizations
Securities transferred to re-securitization entities	24,100	46,600
Fair value of re-securitizations deals in which the entity holds a retained interest	1,400	1,200
Market value of retained interest related to re-securitization transaction	802	641
Original fair value of re-securitizations deals in which the entity holds a retained interest	$ 79,400	$ 78,400