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FAIR VALUE DISCLOSURES - Fair Value Measurement Reconciliation for All Levels (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Total gains and (losses), realized and unrealized, included in:    
Transfers into level 3 $ 183 $ 120
Transfers out of level 3 (879) (169)
Level 3 | Corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 2,472 2,158
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) 1 2
Investment gains (losses), net (3) (1)
Subtotal (2) 1
Other comprehensive income (loss) 11 10
Purchases 145 215
Debt issuances 0  
Sales (98) (56)
Settlements 0 0
Other 0 0
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 0 57
Transfers out of level 3 (697) (47)
Balance, end of period 1,831 2,338
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period 0 0
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period 8 10
Level 3 | States and political subdivisions    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 0 27
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) 0 0
Investment gains (losses), net 0 0
Subtotal 0 0
Other comprehensive income (loss) 0 0
Purchases 0 0
Debt issuances 0  
Sales 0 0
Settlements 0 0
Other 0 0
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 0 0
Transfers out of level 3 0 (27)
Balance, end of period 0 0
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period 0 0
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period 0 0
Level 3 | Asset-backed    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 232 47
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) 0 0
Investment gains (losses), net 0 0
Subtotal 0 0
Other comprehensive income (loss) 3 0
Purchases 386 48
Debt issuances 0  
Sales (122) (10)
Settlements 0 0
Other 0 0
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 149 0
Transfers out of level 3 0 (14)
Balance, end of period 648 71
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period 0 0
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period 3 0
Level 3 | CMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 8 7
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) 0 0
Investment gains (losses), net 0 0
Subtotal 0 0
Other comprehensive income (loss) 0 0
Purchases 0 0
Debt issuances 0  
Sales 0 0
Settlements 0 0
Other 0 0
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 0 0
Transfers out of level 3 0 0
Balance, end of period 8 7
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period 0 0
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period 0 0
Level 3 | Fixed maturities, at FVO    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 275 181
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) 2 16
Investment gains (losses), net (4) 0
Subtotal (2) 16
Other comprehensive income (loss) 0 0
Purchases 112 80
Debt issuances 0  
Sales (14) (15)
Settlements 0 0
Other 0 0
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 32 63
Transfers out of level 3 (140) (81)
Balance, end of period 263 244
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period 0 0
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period 0 28
Level 3 | Other equity investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 55 57
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) 0 1
Investment gains (losses), net 0 0
Subtotal 0 1
Other comprehensive income (loss) 0 0
Purchases 3 42
Debt issuances 0  
Sales 0 (42)
Settlements 0 0
Other 0 0
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 2 0
Transfers out of level 3 (42) 0
Balance, end of period 18 58
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period 0 1
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period 0 0
Level 3 | Trading Securities, at Fair Value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 80 61
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) 0 0
Investment gains (losses), net 0 0
Subtotal 0 0
Other comprehensive income (loss) 0 0
Purchases 29 0
Debt issuances 0  
Sales 0 0
Settlements 0 0
Other 0 0
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 0 0
Transfers out of level 3 0 0
Balance, end of period 109 61
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period 0 0
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period 0 0
Level 3 | Notes issued by consolidated VIE’s    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period (172)  
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) 0  
Investment gains (losses), net 0  
Subtotal 0  
Other comprehensive income (loss) 0  
Purchases 0  
Debt issuances (1)  
Sales 0  
Settlements 5  
Other 0  
Activity related to consolidated VIEs/VOEs 0  
Transfers into level 3 0  
Transfers out of level 3 0  
Balance, end of period (168)  
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period 0  
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period 0  
Level 3 | Separate Accounts Assets    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period   0
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss)   0
Investment gains (losses), net   0
Subtotal   0
Other comprehensive income (loss)   0
Purchases   1
Sales   0
Settlements   0
Other   0
Activity related to consolidated VIEs/VOEs   0
Transfers into level 3   0
Transfers out of level 3   0
Balance, end of period   1
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period   0
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period   0
Level 3 | Contingent Payment Arrangement    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period (9) (253)
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) 0 0
Investment gains (losses), net 0 0
Subtotal 0 0
Other comprehensive income (loss) 0 0
Purchases 0 0
Debt issuances 0  
Sales 0 0
Settlements 1 1
Other 0 (2)
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 0 0
Transfers out of level 3 0 0
Balance, end of period (8) (254)
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period 0 0
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period $ 0 $ 0