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FAIR VALUE DISCLOSURES - Fair Value Measurement Reconciliation for All Levels (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Total gains and (losses), realized and unrealized, included in:    
Transfers into level 3 $ 132 $ 36
Transfers out of level 3 (154) (517)
Level 3 | Corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 2,158 2,121
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) 8 6
Investment gains (losses), net (4) (17)
Subtotal 4 (11)
Other comprehensive income (loss) 20 50
Purchases 906 594
Debt issuances 0  
Sales (575) (272)
Settlements 0 0
Other 0 0
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 27 11
Transfers out of level 3 (68) (335)
Balance, end of period 2,472 2,158
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 19 4
Level 3 | States and political subdivisions    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 27 28
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 (1)
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 (27) 0
Balance, end of period 0 27
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 47 0
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) 1 0
Investment gains (losses), net 0 0
Subtotal 1 0
Other comprehensive income (loss) 0 0
Purchases 379 55
Debt issuances 0  
Sales (181) (8)
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 (14) 0
Balance, end of period 232 47
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 1 0
Level 3 | RMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 0 34
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
Sales   0
Settlements   0
Other   0
Activity related to consolidated VIEs/VOEs   0
Transfers into level 3   0
Transfers out of level 3   (34)
Balance, end of period   0
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 | CMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 7 32
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) 1 (1)
Purchases 0 3
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 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 1 (1)
Level 3 | Fixed maturities, at FVO    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 181 224
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) (23) 6
Investment gains (losses), net 1 (1)
Subtotal (22) 5
Other comprehensive income (loss) 0 0
Purchases 163 95
Debt issuances 0  
Sales (107) (47)
Settlements 0 0
Other 0 0
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 105 25
Transfers out of level 3 (45) (121)
Balance, end of period 275 181
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period 18 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 16
Level 3 | Other equity investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 57 17
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) 1 (2)
Investment gains (losses), net 0 0
Subtotal 1 (2)
Other comprehensive income (loss) 0 0
Purchases 0 85
Debt issuances 0  
Sales (2) (42)
Settlements 0 0
Other 0 0
Activity related to consolidated VIEs/VOEs (1) (1)
Transfers into level 3 0 0
Transfers out of level 3 0 0
Balance, end of period 55 57
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period 1 (2)
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 61 55
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) 0 0
Investment gains (losses), net 14 6
Subtotal 14 6
Other comprehensive income (loss) 0 0
Purchases 5 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 80 61
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period 14 6
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 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 0  
Debt issuances 188  
Sales 0  
Settlements (16)  
Other 0  
Activity related to consolidated VIEs/VOEs 0  
Transfers into level 3 0  
Transfers out of level 3 0  
Balance, end of period 172 0
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 1
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
Sales   0
Settlements   0
Other   0
Activity related to consolidated VIEs/VOEs   0
Transfers into level 3   0
Transfers out of level 3   (1)
Balance, end of period   0
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 (253) (247)
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 3 1
Other 241 (7)
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 (9) (253)
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