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INVESTMENTS - Cumulative OTTI Credit Losses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Available for sale debt securities $ 289,031   $ 289,031     $ 290,725
Held to maturity securities 52,897   52,897     53,320
Mortgage-backed securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Cumulative OTTI reclassified (18)   (18)      
Available for sale debt securities 45,109   45,109     44,957
Held to maturity securities 26,559   26,559     26,099
State and municipal securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Available for sale debt securities 9,764   9,764     8,765
Held to maturity securities 7,480   7,480     8,897
Foreign government securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Available for sale debt securities 97,825   97,825     100,533
Held to maturity securities 1,348   1,348     $ 740
Corporate            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Available for sale debt securities 12,601   12,601      
Other debt securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Available for sale debt securities 3,591   3,591      
AFS debt securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Beginning balance 31 $ 30 48 $ 31    
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    
Changes due to credit-impaired securities sold, transferred or matured (24) (22) (41) (23)    
Ending balance 7 8 7 8    
AFS debt securities | Mortgage-backed securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Beginning balance 25 0 38 0    
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    
Changes due to credit-impaired securities sold, transferred or matured (24) 0 (37) 0    
Ending balance 1 0 1 0    
AFS debt securities | State and municipal securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Beginning balance 0 4 4 4    
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    
Changes due to credit-impaired securities sold, transferred or matured 0 0 (4) 0    
Ending balance 0 4 0 4    
AFS debt securities | Foreign government 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 0    
Credit impairments recognized in earnings on securities that have been previously impaired 0 0 0 0    
Changes due to credit-impaired securities sold, transferred or matured 0 0 0 0    
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 4 4 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    
Changes due to credit-impaired securities sold, transferred or matured 0 0 0 (1)    
Ending balance 4 4 4 4    
AFS debt securities | Other debt securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Beginning balance 2 22 2 22    
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    
Changes due to credit-impaired securities sold, transferred or matured 0 (22) 0 (22)    
Ending balance 2 0 2 0    
HTM debt securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Beginning balance 0 100 57 104    
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    
Changes due to credit-impaired securities sold, transferred or matured 0 0 (57) (4)    
Ending balance 0 100 0 100    
HTM debt securities | Mortgage-backed securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Beginning balance 0 97 54 101    
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    
Changes due to credit-impaired securities sold, transferred or matured 0 0 (54) (4)    
Ending balance 0 97 0 97    
HTM debt securities | State and municipal securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Beginning balance 0 3 3 3    
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    
Changes due to credit-impaired securities sold, transferred or matured 0 0 (3) 0    
Ending balance $ 0 $ 3 $ 0 $ 3    
Accounting Standards Update 2017-12            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Available for sale debt securities         $ 4,000  
Held to maturity securities         $ (4,000)