DERIVATIVES - Offsetting of Financial Assets and Liabilities and Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivative
Assets:
Gross Amount Recognized	$ 1,503	$ 63
Gross Amount Offset in the Balance Sheets	1,177	18
Net Amount Presented in the Balance Sheets	326	45
Gross Amount not Offset in the Balance Sheets	(178)	0
Net Amount	148	45
Liabilities:
Gross Amount Recognized	1,180	19
Gross Amount Offset in the Balance Sheets	1,177	18
Net Amount Presented in the Balance Sheets	3	1
Gross Amount not Offset in the Balance Sheets	0	0
Net Amount	3	1
Secured lending
Assets:
Gross Amount Recognized	6
Gross Amount Offset in the Balance Sheets	0
Net Amount Presented in the Balance Sheets	6
Gross Amount not Offset in the Balance Sheets	0
Net Amount	6
Liabilities:
Gross Amount Recognized	6
Gross Amount Offset in the Balance Sheets	0
Net Amount Presented in the Balance Sheets	6
Gross Amount not Offset in the Balance Sheets	0
Net Amount	6
Other financial assets
Assets:
Gross Amount Recognized	19	2
Gross Amount Offset in the Balance Sheets	0	0
Net Amount Presented in the Balance Sheets	19	2
Gross Amount not Offset in the Balance Sheets	0	0
Net Amount	19	2
Other invested assets
Assets:
Gross Amount Recognized	1,528	65
Gross Amount Offset in the Balance Sheets	1,177	18
Net Amount Presented in the Balance Sheets	351	47
Gross Amount not Offset in the Balance Sheets	(178)	0
Net Amount	173	47
Other financial liabilities
Liabilities:
Gross Amount Recognized	2,160	72
Gross Amount Offset in the Balance Sheets	0	0
Net Amount Presented in the Balance Sheets	2,160	72
Gross Amount not Offset in the Balance Sheets	0	0
Net Amount	2,160	72
Other liabilities
Liabilities:
Gross Amount Recognized	3,346	91
Gross Amount Offset in the Balance Sheets	1,177	18
Net Amount Presented in the Balance Sheets	2,169	73
Gross Amount not Offset in the Balance Sheets	0	0
Net Amount	$ 2,169	$ 73