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INVESTMENTS - Cumulative OTTI Credit Losses (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
AFS debt securities    
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward    
Beginning balance $ 10 $ 5
Credit impairments recognized in earnings on securities not previously impaired 0 0
Credit impairments recognized in earnings on securities that have been previously impaired 0 0
Changes due to credit-impaired securities sold, transferred or matured 0 0
Ending balance 10 5
AFS debt securities | Mortgage-backed securities    
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward    
Beginning balance 1 1
Credit impairments recognized in earnings on securities not previously impaired 0 0
Credit impairments recognized in earnings on securities that have been previously impaired 0 0
Changes due to credit-impaired securities sold, transferred or matured 0 0
Ending balance 1 1
AFS debt securities | State and municipal securities    
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward    
Beginning balance 4 0
Credit impairments recognized in earnings on securities not previously impaired 0 0
Credit impairments recognized in earnings on securities that have been previously impaired 0 0
Changes due to credit-impaired securities sold, transferred or matured 0 0
Ending balance 4 0
AFS debt securities | Corporate    
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward    
Beginning balance 4 4
Credit impairments recognized in earnings on securities not previously impaired 0 0
Credit impairments recognized in earnings on securities that have been previously impaired 0 0
Changes due to credit-impaired securities sold, transferred or matured 0 0
Ending balance 4 4
AFS debt securities | Other debt securities    
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward    
Beginning balance 1 0
Credit impairments recognized in earnings on securities not previously impaired 0 0
Credit impairments recognized in earnings on securities that have been previously impaired 0 0
Changes due to credit-impaired securities sold, transferred or matured 0 0
Ending balance $ 1 0
HTM debt securities    
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward    
Beginning balance   0
Credit impairments recognized in earnings on securities not previously impaired   0
Credit impairments recognized in earnings on securities that have been previously impaired   0
Changes due to credit-impaired securities sold, transferred or matured   0
Ending balance   0
HTM debt securities | Mortgage-backed securities    
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward    
Beginning balance   0
Credit impairments recognized in earnings on securities not previously impaired   0
Credit impairments recognized in earnings on securities that have been previously impaired   0
Changes due to credit-impaired securities sold, transferred or matured   0
Ending balance   0
HTM debt securities | State and municipal securities    
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward    
Beginning balance   0
Credit impairments recognized in earnings on securities not previously impaired   0
Credit impairments recognized in earnings on securities that have been previously impaired   0
Changes due to credit-impaired securities sold, transferred or matured   0
Ending balance   $ 0