ACQUISITIONS, Identifiable Intangible Assets Acquired (Details) - USD ($) $ in Millions		5 Months Ended
	Jun. 01, 2022	Jul. 01, 2022
TriState Capital
Acquired Finite-Lived Intangible Assets [Line Items]
Total identifiable intangibles assets acquired	$ 197
TriState Capital | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated fair value, indefinite lived intangible assets	5
TriState Capital | Core deposit intangible
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated fair value, definite lived intangible assets	$ 89
Weighted average estimated useful life	10 years
TriState Capital | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated fair value, definite lived intangible assets	$ 54
Weighted average estimated useful life	17 years
TriState Capital | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated fair value, definite lived intangible assets	$ 33
Weighted average estimated useful life	20 years
TriState Capital | Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated fair value, definite lived intangible assets	$ 16
Weighted average estimated useful life	10 years
Charles Stanley and SumRidge Partners
Acquired Finite-Lived Intangible Assets [Line Items]
Total identifiable intangibles assets acquired		$ 137
Charles Stanley and SumRidge Partners | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated fair value, definite lived intangible assets		$ 80
Weighted average estimated useful life		12 years
Charles Stanley and SumRidge Partners | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated fair value, definite lived intangible assets		$ 17
Weighted average estimated useful life		9 years
Charles Stanley and SumRidge Partners | Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated fair value, definite lived intangible assets		$ 40
Weighted average estimated useful life		8 years