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INVESTMENTS - Cumulative OTTI Credit Losses (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
AFS debt securities        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Beginning balance $ 8 $ 59 $ 31 $ 73
Credit impairments recognized in earnings on securities not previously impaired 0 0 0 2
Credit impairments recognized in earnings on securities that have been previously impaired 2 0 2 2
Reductions due to credit-impaired securities sold, transferred or matured 0 (26) (23) (44)
Ending balance 10 33 10 33
AFS debt securities | Mortgage-backed securities        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Beginning balance 0 0 0 0
Credit impairments recognized in earnings on securities not previously impaired 0 0 0 1
Credit impairments recognized in earnings on securities that have been previously impaired 0 0 0 0
Reductions due to credit-impaired securities sold, transferred or matured 0 0 0 (1)
Ending balance 0 0 0 0
AFS debt securities | State and municipal securities        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Beginning balance 4 4 4 12
Credit impairments recognized in earnings on securities not previously impaired 0 0 0 0
Credit impairments recognized in earnings on securities that have been previously impaired 0 0 0 0
Reductions due to credit-impaired securities sold, transferred or matured 0 0 0 (8)
Ending balance 4 4 4 4
AFS debt securities | Foreign government securities        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Beginning balance 0 5 0 5
Credit impairments recognized in earnings on securities not previously impaired 0 0 0 0
Credit impairments recognized in earnings on securities that have been previously impaired 0 0 0 0
Reductions due to credit-impaired securities sold, transferred or matured 0 (5) 0 (5)
Ending balance 0 0 0 0
AFS debt securities | Corporate        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Beginning balance 4 7 5 9
Credit impairments recognized in earnings on securities not previously impaired 0 0 0 1
Credit impairments recognized in earnings on securities that have been previously impaired 0 0 0 2
Reductions due to credit-impaired securities sold, transferred or matured 0 (1) (1) (6)
Ending balance 4 6 4 6
AFS debt securities | Other debt securities        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Beginning balance 0 43 22 47
Credit impairments recognized in earnings on securities not previously impaired 0 0 0 0
Credit impairments recognized in earnings on securities that have been previously impaired 2 0 2 0
Reductions due to credit-impaired securities sold, transferred or matured 0 (20) (22) (24)
Ending balance 2 23 2 23
HTM debt securities        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Beginning balance 100 112 104 136
Credit impairments recognized in earnings on securities not previously impaired 0 0 0 1
Credit impairments recognized in earnings on securities that have been previously impaired 0 0 0 0
Reductions due to credit-impaired securities sold, transferred or matured 0 (2) (4) (27)
Ending balance 100 110 100 110
HTM debt securities | Mortgage-backed securities        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Beginning balance 97 108 101 132
Credit impairments recognized in earnings on securities not previously impaired 0 0 0 0
Credit impairments recognized in earnings on securities that have been previously impaired 0 0 0 0
Reductions due to credit-impaired securities sold, transferred or matured 0 (2) (4) (26)
Ending balance 97 106 97 106
HTM debt securities | State and municipal securities        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Beginning balance 3 4 3 4
Credit impairments recognized in earnings on securities not previously impaired 0 0 0 1
Credit impairments recognized in earnings on securities that have been previously impaired 0 0 0 0
Reductions due to credit-impaired securities sold, transferred or matured 0 0 0 (1)
Ending balance $ 3 $ 4 $ 3 $ 4