LOANS - Corporate Loans Gross Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 2,000	$ 1,237	$ 5,513	$ 3,689
Corporate loans
Financing Receivable, Credit Quality Indicator [Line Items]
2023			9
2022			19
2021			1
2020			2
2019			0
Prior			4
Revolving line of credit arrangement			162
Total	$ 72	$ 43	197	$ 148
Corporate loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2023			9
2022			19
2021			1
2020			1
2019			0
Prior			2
Revolving line of credit arrangement			73
Total			105
Corporate loans | 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			38
Total			38
Corporate loans | 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			1
Total			4
Corporate loans | 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			50
Total			$ 50