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FAIR VALUE DISCLOSURES - Fair Value Measurement Reconciliation for All Levels (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Total gains (losses), realized and unrealized, included in:        
Transfers into level 3   $ 213 $ 27  
Transfers out of level 3   (200) (785)  
Corporate | Level 3        
Total gains (losses), realized and unrealized, included in:        
Beginning Balance   1,504 1,702 $ 1,257
Investment gains (losses), reported in net investment income   5 5 4
Net derivative gains (losses)   (5) (16) (16)
Total realized and unrealized gains (losses)   0 (11) (12)
Other comprehensive income (loss)   (159) 34 (17)
Purchases   1,107 938 514
Sales   (378) (473) 226
Activity related to consolidated VIEs/VOEs   0 0 0
Transfers into level 3   168 27 189
Transfers out of level 3   (121) (713) 3
Ending Balance $ 1,504 2,121 1,504 1,702
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period   0 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   (156) 28 (18)
States and political subdivisions | Level 3        
Total gains (losses), realized and unrealized, included in:        
Beginning Balance   35 39 39
Investment gains (losses), reported in net investment income   0 0 0
Net derivative gains (losses)   0 0 0
Total realized and unrealized gains (losses)   0 0 0
Other comprehensive income (loss)   (5) (2) 2
Purchases   0 0 0
Sales   (2) (2) 2
Activity related to consolidated VIEs/VOEs   0 0 0
Transfers into level 3   0 0 0
Transfers out of level 3   0 0 0
Ending Balance 35 28 35 39
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period   0 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   (5) (2) 2
Asset-backed | Level 3        
Total gains (losses), realized and unrealized, included in:        
Beginning Balance   8 20 100
Investment gains (losses), reported in net investment income   0 0 0
Net derivative gains (losses)   0 0 0
Total realized and unrealized gains (losses)   0 0 0
Other comprehensive income (loss)   0 0 0
Purchases   0 6 20
Sales   (2) (18) 0
Activity related to consolidated VIEs/VOEs   0 0 0
Transfers into level 3   0 0 0
Transfers out of level 3   (6) 0 100
Ending Balance 8 0 8 20
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period   0 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 0
CMBS | Level 3        
Total gains (losses), realized and unrealized, included in:        
Beginning Balance   20 0 0
Investment gains (losses), reported in net investment income   0 0 0
Net derivative gains (losses)   0 0 0
Total realized and unrealized gains (losses)   0 0 0
Other comprehensive income (loss)   (2) 0 0
Purchases   14 20 0
Sales   0 0 0
Activity related to consolidated VIEs/VOEs   0 0 0
Transfers into level 3   0 0 0
Transfers out of level 3   0 0 0
Ending Balance 20 32 20 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 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   (2) 0 0
RMBS | Level 3        
Total gains (losses), realized and unrealized, included in:        
Beginning Balance   0 0 0
Investment gains (losses), reported in net investment income   0 0 0
Net derivative gains (losses)   0 0 0
Total realized and unrealized gains (losses)   0 0 0
Other comprehensive income (loss)   0 0 0
Purchases   34 0 0
Sales   0 0 0
Activity related to consolidated VIEs/VOEs   0 0 0
Transfers into level 3   0 0 0
Transfers out of level 3   0 0 0
Ending Balance 0 34 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 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 0
Trading Securities, at Fair Value | Level 3        
Total gains (losses), realized and unrealized, included in:        
Beginning Balance   65 39 36
Investment gains (losses), reported in net investment income   0 0 0
Net derivative gains (losses)   (10) 26 3
Total realized and unrealized gains (losses)   (10) 26 3
Other comprehensive income (loss)   0 0 0
Purchases   0 0 0
Sales   0 0 0
Activity related to consolidated VIEs/VOEs   0 0 0
Transfers into level 3   0 0 0
Transfers out of level 3   0 0 0
Ending Balance 65 55 65 39
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period   (10) 26 3
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 0
Fixed maturities, at FVO | Level 3        
Total gains (losses), realized and unrealized, included in:        
Beginning Balance   201 80 0
Investment gains (losses), reported in net investment income   (11) 5 0
Net derivative gains (losses)   0 0 0
Total realized and unrealized gains (losses)   (11) 5 0
Other comprehensive income (loss)   0 0 0
Purchases   98 211 81
Sales   (36) (23) 1
Activity related to consolidated VIEs/VOEs   0 0 0
Transfers into level 3   45 0 0
Transfers out of level 3   (73) (72) 0
Ending Balance 201 224 201 80
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period   (2) 5 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 0
Other equity investments | Level 3        
Total gains (losses), realized and unrealized, included in:        
Beginning Balance   16 84 113
Investment gains (losses), reported in net investment income   (1) 21 (8)
Net derivative gains (losses)   0 0 0
Total realized and unrealized gains (losses)   (1) 21 (8)
Other comprehensive income (loss)   0 0 0
Purchases   8 8 9
Sales   0 (92) (26)
Settlements   0   0
Change in estimate       0
Other   0 0  
Activity related to consolidated VIEs/VOEs   (3) (4) (4)
Transfers into level 3   0 0 0
Transfers out of level 3   (3) (1) 0
Ending Balance 16 17 16 84
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period   (1) 2 (8)
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 0
Investment gains (losses), reported in net investment income   0 0 0
Net derivative gains (losses)   0 0 0
Total realized and unrealized gains (losses)   0 0 0
Other comprehensive income (loss)   0 0 0
Purchases   0 1 1
Sales   0 0 0
Settlements   0   0
Change in estimate       0
Other   0 0  
Activity related to consolidated VIEs/VOEs   0 0 0
Transfers into level 3   0 0 0
Transfers out of level 3   0 (1) 0
Ending Balance 1 1 1 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 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
Contingent Payment Arrangement | Level 3        
Total gains (losses), realized and unrealized, included in:        
Beginning Balance   (38) (28) (23)
Investment gains (losses), reported in net investment income   0 0 0
Net derivative gains (losses)   0 0 0
Total realized and unrealized gains (losses)   0 0 0
Other comprehensive income (loss)   0 0 0
Purchases   (231) (7) (4)
Sales   0 0 0
Settlements   0   1
Change in estimate       1
Other   22 0  
Activity related to consolidated VIEs/VOEs   0 (3) (3)
Transfers into level 3   0 0 0
Transfers out of level 3 0 0   0
Ending Balance $ (38) (247) (38) (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 (7)
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