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FAIR VALUE DISCLOSURES - Fair Value Measurement Reconciliation for All Levels (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Total gains (losses), realized and unrealized, included in:    
Transfers into level 3 $ 56 $ 258
Transfers out of level 3 (401) (110)
Corporate | Level 3    
Total gains (losses), realized and unrealized, included in:    
Beginning Balance 2,121 1,504
Investment gains (losses), reported in net investment income 2 1
Net derivative gains (losses) (3) 1
Total realized and unrealized gains (losses) (1) 2
Other comprehensive income (loss) 18 (31)
Purchases 171 232
Sales (91) (87)
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 0 70
Transfers out of level 3 (268) (7)
Ending Balance 1,950 1,683
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 17 (29)
States and political subdivisions | Level 3    
Total gains (losses), realized and unrealized, included in:    
Beginning Balance 28 35
Investment gains (losses), reported in net investment income 0 0
Net derivative gains (losses) 0 0
Total realized and unrealized gains (losses) 0 0
Other comprehensive income (loss) 0 (2)
Purchases 0 0
Sales 0 (1)
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 0 0
Transfers out of level 3 0 0
Ending Balance 28 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 0 (2)
Asset-backed | Level 3    
Total gains (losses), realized and unrealized, included in:    
Beginning Balance 0 8
Investment gains (losses), reported in net investment income 0 0
Net derivative gains (losses) 0 0
Total realized and unrealized gains (losses) 0 0
Other comprehensive income (loss) 0 0
Purchases 12 325
Sales 0 (1)
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 0 0
Transfers out of level 3 0 0
Ending Balance 12 332
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
CMBS | Level 3    
Total gains (losses), realized and unrealized, included in:    
Beginning Balance 32 20
Investment gains (losses), reported in net investment income 0 0
Net derivative gains (losses) 0 0
Total realized and unrealized gains (losses) 0 0
Other comprehensive income (loss) 0 (1)
Purchases 2 219
Sales 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 34 238
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 (1)
RMBS | Level 3    
Total gains (losses), realized and unrealized, included in:    
Beginning Balance 34 0
Investment gains (losses), reported in net investment income 0 0
Net derivative gains (losses) 0 0
Total realized and unrealized gains (losses) 0 0
Other comprehensive income (loss) 0 0
Purchases 0 0
Sales 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 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
Trading Securities, at Fair Value | Level 3    
Total gains (losses), realized and unrealized, included in:    
Beginning Balance 55 65
Investment gains (losses), reported in net investment income 0 0
Net derivative gains (losses) 0 (13)
Total realized and unrealized gains (losses) 0 (13)
Other comprehensive income (loss) 0 0
Purchases 0 0
Sales 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 55 52
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period 0 (13)
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
Fixed maturities, at FVO | Level 3    
Total gains (losses), realized and unrealized, included in:    
Beginning Balance 224 201
Investment gains (losses), reported in net investment income 3 (4)
Net derivative gains (losses) 0 0
Total realized and unrealized gains (losses) 3 (4)
Other comprehensive income (loss) 0 0
Purchases 12 89
Sales 0 (29)
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 56 188
Transfers out of level 3 (99) (103)
Ending Balance 196 342
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period 3 (4)
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
Other equity investments | Level 3    
Total gains (losses), realized and unrealized, included in:    
Beginning Balance 17 16
Investment gains (losses), reported in net investment income (3) 0
Net derivative gains (losses) 0 0
Total realized and unrealized gains (losses) (3) 0
Other comprehensive income (loss) 0 0
Purchases 0 0
Sales 0 0
Settlements 0  
Other 0 0
Activity related to consolidated VIEs/VOEs 0 (2)
Transfers into level 3 1 0
Transfers out of level 3 0 (3)
Ending Balance 15 11
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period (3) 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
Separate Accounts Assets | Level 3    
Total gains (losses), realized and unrealized, included in:    
Beginning Balance 1 1
Investment gains (losses), reported in net investment income 0 0
Net derivative gains (losses) 0 0
Total realized and unrealized gains (losses) 0 0
Other comprehensive income (loss) 0 0
Purchases 0 0
Sales 0 (1)
Settlements 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 1 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
Contingent Payment Arrangement | Level 3    
Total gains (losses), realized and unrealized, included in:    
Beginning Balance (247) (38)
Investment gains (losses), reported in net investment income 0 0
Net derivative gains (losses) 0 0
Total realized and unrealized gains (losses) 0 0
Other comprehensive income (loss) 0 0
Purchases   1
Sales 0 0
Settlements 0  
Other (1) 0
Activity related to consolidated VIEs/VOEs 0 0
Transfers into level 3 0 0
Transfers out of level 3 0 0
Ending Balance (248) (37)
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