DERIVATIVES - Offsetting of Financial Assets and Liabilities and Derivative Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivative
Assets:
Gross Amount Recognized	$ 2,235	$ 1,503
Gross Amount Offset in the Balance Sheets	2,089	1,177
Net Amount Presented in the Balance Sheets	146	326
Gross Amount not Offset in the Balance Sheets	0	(178)
Net Amount	146	148
Liabilities:
Gross Amount Recognized	2,089	1,180
Gross Amount Offset in the Balance Sheets	2,089	1,177
Net Amount Presented in the Balance Sheets	0	3
Gross Amount not Offset in the Balance Sheets	0	0
Net Amount	0	3
Secured lending
Assets:
Gross Amount Recognized	21	6
Gross Amount Offset in the Balance Sheets	0	0
Net Amount Presented in the Balance Sheets	21	6
Gross Amount not Offset in the Balance Sheets	0	0
Net Amount	21	6
Liabilities:
Gross Amount Recognized	21	6
Gross Amount Offset in the Balance Sheets	0	0
Net Amount Presented in the Balance Sheets	21	6
Gross Amount not Offset in the Balance Sheets	0	0
Net Amount	21	6
Other financial assets
Assets:
Gross Amount Recognized	7	19
Gross Amount Offset in the Balance Sheets	0	0
Net Amount Presented in the Balance Sheets	7	19
Gross Amount not Offset in the Balance Sheets	0	0
Net Amount	7	19
Other invested assets
Assets:
Gross Amount Recognized	2,263	1,528
Gross Amount Offset in the Balance Sheets	2,089	1,177
Net Amount Presented in the Balance Sheets	174	351
Gross Amount not Offset in the Balance Sheets	0	(178)
Net Amount	174	173
Other financial liabilities
Liabilities:
Gross Amount Recognized	2,207	2,160
Gross Amount Offset in the Balance Sheets	0	0
Net Amount Presented in the Balance Sheets	2,207	2,160
Gross Amount not Offset in the Balance Sheets	0	0
Net Amount	2,207	2,160
Other liabilities
Liabilities:
Gross Amount Recognized	4,317	3,346
Gross Amount Offset in the Balance Sheets	2,089	1,177
Net Amount Presented in the Balance Sheets	2,228	2,169
Gross Amount not Offset in the Balance Sheets	0	0
Net Amount	$ 2,228	$ 2,169