LOANS - Corporate Loans Gross Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 2,726	$ 2,609	$ 8,375	$ 8,014
Corporate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			18	11
Prior year			4	39
Two years prior			141	14
Three years prior			0	9
Four years prior			62	4
Prior			17	116
Revolving line of credit arrangement			134	227
Total	$ 114	$ 113	376	420
Corporate loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			12	10
Prior year			4	2
Two years prior			0	3
Three years prior			0	9
Four years prior			0	4
Prior			6	15
Revolving line of credit arrangement			97	167
Total			119	210
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			0	1
Revolving line of credit arrangement			9	9
Total			9	10
Corporate loans | Mortgage and real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			0	1
Prior year			0	37
Two years prior			0	11
Three years prior			0	0
Four years prior			0	0
Prior			9	84
Revolving line of credit arrangement			7	22
Total			16	155
Corporate loans | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			6	0
Prior year			0	0
Two years prior			141	0
Three years prior			0	0
Four years prior			62	0
Prior			2	16
Revolving line of credit arrangement			21	29
Total			$ 232	$ 45