GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Goodwill Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 2,477	$ 2,477
Goodwill additions	1	0
Goodwill, ending balance	2,478	2,477
Community Banking
Goodwill [Roll Forward]
Goodwill, beginning balance	2,446	2,446
Goodwill additions	0	0
Goodwill, ending balance	2,446	2,446
Wealth Manage- ment
Goodwill [Roll Forward]
Goodwill, beginning balance	8	8
Goodwill additions	0	0
Goodwill, ending balance	8	8
Insurance
Goodwill [Roll Forward]
Goodwill, beginning balance	23	23
Goodwill additions	1	0
Goodwill, ending balance	$ 24	$ 23