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FAIR VALUE - Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs by Asset Type (Details) - Market Value - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 1,745 $ 2,125 $ 1,725 $ 1,997
Total gains or (losses) (realized/unrealized)        
Included in earnings 1 (4) 2 (3)
Included in other comprehensive income (loss) (9) (54) 4 (87)
Purchases, issuances and settlements 105 97 111 256
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories 0 0 0 0
Ending balance 1,842 2,163 1,842 2,163
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date 0 2 0 3
Corporate Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 709 715 715 730
Total gains or (losses) (realized/unrealized)        
Included in earnings 1 (5) 2 (3)
Included in other comprehensive income (loss) (2) (3) (6) (7)
Purchases, issuances and settlements 3 28 0 15
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories 0 128 0 128
Ending balance 711 862 711 862
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date 0 (5) 0 (5)
Asset Backed Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 1,020 1,389 994 1,251
Total gains or (losses) (realized/unrealized)        
Included in earnings 0 0 0 0
Included in other comprehensive income (loss) (8) (47) 10 (76)
Purchases, issuances and settlements 103 62 111 228
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories 0 (148) 0 (148)
Ending balance 1,115 1,255 1,115 1,255
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date 0 8 0 8
CMBS        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance   6   0
Total gains or (losses) (realized/unrealized)        
Included in earnings   0   0
Included in other comprehensive income (loss)   0   0
Purchases, issuances and settlements   0   6
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories   0   0
Ending balance   6   6
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date 0 0   0
Foreign Corporate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 16 16 16 16
Total gains or (losses) (realized/unrealized)        
Included in earnings 0 0 0 0
Included in other comprehensive income (loss) 0 (4) 0 (4)
Purchases, issuances and settlements 0 8 0 8
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories 0 20 0 20
Ending balance $ 16 40 16 40
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date   $ 0 $ 0 $ 0