GOODWILL - Goodwill Rollforward (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 8,173
Business acquisitions	15
Balance at end of period	8,188
Consumer Banking
Goodwill [Roll Forward]
Balance at beginning of period	2,673
Business acquisitions	5
Balance at end of period	2,678
Commercial Banking
Goodwill [Roll Forward]
Balance at beginning of period	5,500
Business acquisitions	10
Balance at end of period	$ 5,510