MORTGAGE BANKING AND OTHER SERVICED LOANS - Changes Related to MSRs - Fair Value Method (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
MSRs
Fair value as of beginning of period	$ 1,491
Fair value at end of the period	1,455	$ 1,491
Residential mortgages
MSRs
Fair value as of beginning of period	1,491	1,552
Amounts capitalized	159	106
Sales	(72)	(99)
Changes in unpaid principal balance during the period	(168)	(176)
Changes in fair value during the period	45	108
Fair value at end of the period	1,455	1,491
MSR loans	94,900	95,600
Federal Home Loan Mortgage Corporation (FHLMC)
MSRs
MSR loans	$ 10,500	$ 17,800