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	$ 15,220	$ 12,495
Gross Amount Offset in the Balance Sheets	11,787	8,326
Net Amount Presented in the Balance Sheets	3,433	4,169
Gross Amount not Offset in the Balance Sheets	(2,516)	(3,076)
Net Amount	917	1,093
Liabilities:
Gross Amount Recognized	11,789	8,359
Gross Amount Offset in the Balance Sheets	11,787	8,326
Net Amount Presented in the Balance Sheets	2	33
Gross Amount not Offset in the Balance Sheets	0	0
Net Amount	2	33
Secured lending
Assets:
Gross Amount Recognized	126	93
Gross Amount Offset in the Balance Sheets	0	0
Net Amount Presented in the Balance Sheets	126	93
Gross Amount not Offset in the Balance Sheets	0	0
Net Amount	126	93
Liabilities:
Gross Amount Recognized	126	93
Gross Amount Offset in the Balance Sheets	0	0
Net Amount Presented in the Balance Sheets	126	93
Gross Amount not Offset in the Balance Sheets	0	0
Net Amount	126	93
Other financial assets
Assets:
Gross Amount Recognized	1,710	1,690
Gross Amount Offset in the Balance Sheets	0	0
Net Amount Presented in the Balance Sheets	1,710	1,690
Gross Amount not Offset in the Balance Sheets	0	0
Net Amount	1,710	1,690
Other invested assets
Assets:
Gross Amount Recognized	17,056	14,278
Gross Amount Offset in the Balance Sheets	11,787	8,326
Net Amount Presented in the Balance Sheets	5,269	5,952
Gross Amount not Offset in the Balance Sheets	(2,516)	(3,076)
Net Amount	2,753	2,876
Other financial liabilities
Liabilities:
Gross Amount Recognized	2,496	2,370
Gross Amount Offset in the Balance Sheets	0	0
Net Amount Presented in the Balance Sheets	2,496	2,370
Gross Amount not Offset in the Balance Sheets	0	0
Net Amount	2,496	2,370
Other liabilities
Liabilities:
Gross Amount Recognized	14,411	10,822
Gross Amount Offset in the Balance Sheets	11,787	8,326
Net Amount Presented in the Balance Sheets	2,624	2,496
Gross Amount not Offset in the Balance Sheets	0	0
Net Amount	$ 2,624	$ 2,496