GOODWILL AND INTANGIBLE ASSETS - Goodwill Rollforward (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 7,116
Business acquisitions	965
Balance at end of period	8,081
Consumer Banking
Goodwill [Roll Forward]
Balance at beginning of period	2,258
Business acquisitions	319
Balance at end of period	2,577
Commercial Banking
Goodwill [Roll Forward]
Balance at beginning of period	4,858
Business acquisitions	646
Balance at end of period	$ 5,504