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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Components of and Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance $ 6,462 $ 6,155 $ 1,798 $ 1,685
Other comprehensive income (loss) before reclassifications 569 23 (236) 214
Amounts reclassified to (from) net income 59 (6) 10 21
Deferred income tax benefit (expense) (130) (13) 8 5
Ending balance 9,015 6,462 1,911 1,798
Change in Net Unrealized Investment Gains (Losses)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (544) (438) (610) (1,017)
Other comprehensive income (loss) before reclassifications 449 (133) (303) 408
Amounts reclassified to (from) net income (8) (6) 10 20
Deferred income tax benefit (expense) (96) 33 14 (21)
Ending balance (199) (544) (889) (610)
Change in Discount Rate for Future Policy Benefits        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 398 239 329 507
Other comprehensive income (loss) before reclassifications 114 206 86 (204)
Amounts reclassified to (from) net income 0 0 0 0
Deferred income tax benefit (expense) (24) (47) (6) 26
Ending balance 488 398 409 329
Change in Instrument-Specific Credit Risk for Market Risk Benefits        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (53) (15) 5 (7)
Other comprehensive income (loss) before reclassifications (3) (40) (22) 12
Amounts reclassified to (from) net income 67 0 0 0
Deferred income tax benefit (expense) (4) 2 0 0
Ending balance 7 (53) (17) 5
Defined Benefit Pension Plan Adjustment        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 88 85 1 0
Other comprehensive income (loss) before reclassifications 20 4 2 0
Amounts reclassified to (from) net income 0 0 0 1
Deferred income tax benefit (expense) (4) (1) 0 0
Ending balance 104 88 3 1
Foreign Currency Translation        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (5) 9 (8) (6)
Other comprehensive income (loss) before reclassifications (11) (14) 1 (2)
Amounts reclassified to (from) net income 0 0 0 0
Deferred income tax benefit (expense) (2) 0 0 0
Ending balance (18) (5) (7) (8)
Total        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (116) (120) (283) (523)
Ending balance $ 382 $ (116) $ (501) $ (283)