LOANS - Corporate Loans Gross Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 2,609	$ 2,000	$ 8,014	$ 5,513
Corporate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			11	9
Prior year			39	19
Two years prior			14	1
Three years prior			9	2
Four years prior			4	0
Prior			116	4
Revolving line of credit arrangement			227	162
Total	$ 113	$ 72	420	197
Corporate loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			10	9
Prior year			2	19
Two years prior			3	1
Three years prior			9	1
Four years prior			4	0
Prior			15	2
Revolving line of credit arrangement			167	73
Total			210	105
Corporate loans | Financial institutions
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			0	0
Prior year			0	0
Two years prior			0	0
Three years prior			0	0
Four years prior			0	0
Prior			1	0
Revolving line of credit arrangement			9	38
Total			10	38
Corporate loans | Mortgage and real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			1	0
Prior year			37	0
Two years prior			11	0
Three years prior			0	1
Four years prior			0	0
Prior			84	2
Revolving line of credit arrangement			22	1
Total			155	4
Corporate loans | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			0	0
Prior year			0	0
Two years prior			0	0
Three years prior			0	0
Four years prior			0	0
Prior			16	0
Revolving line of credit arrangement			29	50
Total			$ 45	$ 50