LOANS - Corporate Loans Gross Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 1,879	$ 1,212	$ 3,513	$ 2,452
Corporate
Financing Receivable, Credit Quality Indicator [Line Items]
2023			8
2022			0
2021			0
2020			2
2019			0
Prior			4
Revolving line of credit arrangement			111
Total	$ 86	$ 57	125	$ 105
Corporate | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2023			8
2022			0
2021			0
2020			1
2019			0
Prior			2
Revolving line of credit arrangement			48
Total			59
Corporate | Financial institutions
Financing Receivable, Credit Quality Indicator [Line Items]
2023			0
2022			0
2021			0
2020			0
2019			0
Prior			0
Revolving line of credit arrangement			33
Total			33
Corporate | Mortgage and real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2023			0
2022			0
2021			0
2020			1
2019			0
Prior			2
Revolving line of credit arrangement			0
Total			3
Corporate | Other
Financing Receivable, Credit Quality Indicator [Line Items]
2023			0
2022			0
2021			0
2020			0
2019			0
Prior			0
Revolving line of credit arrangement			30
Total			$ 30