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FAIR VALUE DISCLOSURES - Fair Value Measurement Reconciliation for All Levels (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Total gains and (losses), realized and unrealized, included in:    
Transfers into level 3 $ 36 $ 213
Transfers out of level 3 (517) (200)
Level 3 | Corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 2,121 1,504
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) 6 5
Investment gains (losses), net (17) (5)
Subtotal (11) 0
Other comprehensive income (loss) 50 (159)
Purchases 594 1,107
Sales (272) (378)
Settlements 0 0
Other 0 0
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 11 168
Transfers out of level 3 (335) (121)
Ending Balance 2,158 2,121
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 4 (156)
Level 3 | States and political subdivisions    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 28 35
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 (5)
Purchases 0 0
Sales (1) (2)
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
Ending Balance 27 28
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 (5)
Level 3 | Asset-backed    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 0 8
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 55 0
Sales (8) (2)
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 (6)
Ending Balance 47 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 | RMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 34 0
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 34
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 (34) 0
Ending Balance 0 34
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 | CMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 32 20
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) (2)
Purchases 3 14
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 (27) 0
Ending Balance 7 32
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) (2)
Level 3 | Fixed maturities, at FVO    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 224 201
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) 6 (11)
Investment gains (losses), net (1) 0
Subtotal 5 (11)
Other comprehensive income (loss) 0 0
Purchases 95 98
Sales (47) (36)
Settlements 0 0
Other 0 0
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 25 45
Transfers out of level 3 (121) (73)
Ending Balance 181 224
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period 0 (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 16 0
Level 3 | Other equity investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 17 16
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) (2) (1)
Investment gains (losses), net 0 0
Subtotal (2) (1)
Other comprehensive income (loss) 0 0
Purchases 85 8
Sales (42) 0
Settlements 0 0
Other 0 0
Activity related to consolidated VIEs/VOEs (1) (3)
Transfers into level 3 0 0
Transfers out of level 3 0 (3)
Ending Balance 57 17
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period (2) (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]    
Beginning Balance 55 65
Total gains and (losses), realized and unrealized, included in:    
Net investment income (loss) 0 0
Investment gains (losses), net 6 (10)
Subtotal 6 (10)
Other comprehensive income (loss) 0 0
Purchases 0 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
Ending Balance 61 55
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period 6 (10)
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 | Separate Accounts Assets    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 1 1
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
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 (1) 0
Ending Balance 0 1
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 | Contingent Payment Arrangement    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (247) (38)
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 (231)
Sales 0 0
Settlements 1 0
Other (7) 22
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 0 0
Transfers out of level 3 0 0
Ending Balance (253) (247)
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