GOODWILL AND INTANGIBLE ASSETS - Other Intangibles (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross	$ 270	$ 271
Accumulated Amortization	113	74
Net	$ 157	197
Core deposits
Finite-Lived Intangible Assets [Line Items]
Amortizable Lives	10 years
Gross	$ 144	144
Accumulated Amortization	44	20
Net	100	124
Acquired technology
Finite-Lived Intangible Assets [Line Items]
Gross	23	23
Accumulated Amortization	21	19
Net	2	4
Acquired relationships
Finite-Lived Intangible Assets [Line Items]
Gross	52	54
Accumulated Amortization	26	21
Net	26	33
Naming Rights
Finite-Lived Intangible Assets [Line Items]
Gross	33	33
Accumulated Amortization	12	7
Net	21	26
Other
Finite-Lived Intangible Assets [Line Items]
Gross	18	17
Accumulated Amortization	10	7
Net	$ 8	$ 10
Minimum | Acquired technology
Finite-Lived Intangible Assets [Line Items]
Amortizable Lives	5 years
Minimum | Acquired relationships
Finite-Lived Intangible Assets [Line Items]
Amortizable Lives	2 years
Minimum | Naming Rights
Finite-Lived Intangible Assets [Line Items]
Amortizable Lives	5 years
Minimum | Other
Finite-Lived Intangible Assets [Line Items]
Amortizable Lives	2 years
Maximum | Acquired technology
Finite-Lived Intangible Assets [Line Items]
Amortizable Lives	7 years
Maximum | Acquired relationships
Finite-Lived Intangible Assets [Line Items]
Amortizable Lives	15 years
Maximum | Naming Rights
Finite-Lived Intangible Assets [Line Items]
Amortizable Lives	10 years
Maximum | Other
Finite-Lived Intangible Assets [Line Items]
Amortizable Lives	8 years