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INVESTMENTS - Cumulative OTTI Credit Losses (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Held to maturity securities $ 53,249   $ 53,249     $ 53,320
Available for sale debt securities 284,782   284,782     290,725
Mortgage-backed securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Cumulative OTTI reclassified (18)   (18)      
Held to maturity securities 26,606   26,606     26,099
Available for sale debt securities 47,019   47,019     44,957
State and municipal securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Held to maturity securities 7,399   7,399     8,897
Available for sale debt securities 9,480   9,480     8,765
Foreign government securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Held to maturity securities 1,151   1,151     740
Available for sale debt securities 94,461   94,461     $ 100,533
Corporate            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Available for sale debt securities 12,380   12,380      
Other debt securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Available for sale debt securities 4,037   4,037      
AFS debt securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Beginning balance 7 $ 8 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 2 0 2    
Changes due to credit-impaired securities sold, transferred or matured 0 0 (41) (23)    
Ending balance 7 10 7 10    
AFS debt securities | Mortgage-backed securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Beginning balance 1 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 0 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 0 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 2 0 2    
Changes due to credit-impaired securities sold, transferred or matured 0 0 0 (22)    
Ending balance 2 2 2 2    
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            
Held to maturity securities         $ (4,000)  
Available for sale debt securities         $ 4,000