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INVESTMENTS - Credit-Related Impairment (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
AFS debt securities    
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward    
Beginning balance $ 5 $ 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 5 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    
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward    
Beginning balance 0 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 0 0
AFS debt securities | Foreign government securities    
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward    
Beginning balance 0 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 0 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 0 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 0 0
HTM debt securities    
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward    
Beginning balance 0 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 0 0
HTM debt securities | Mortgage-backed securities    
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward    
Beginning balance 0 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 0 0
HTM debt securities | State and municipal    
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward    
Beginning balance 0 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 $ 0 $ 0