GOODWILL AND INTANGIBLE ASSETS - Goodwill Rollforward (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 7,116
Business acquisitions	1,044
Balance at end of period	8,160
Consumer Banking
Goodwill [Roll Forward]
Balance at beginning of period	2,258
Business acquisitions	339
Balance at end of period	2,597
Commercial Banking
Goodwill [Roll Forward]
Balance at beginning of period	4,858
Business acquisitions	705
Balance at end of period	$ 5,563