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INVESTMENTS - Cumulative OTTI Credit Losses (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 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 $ 291,523     $ 290,725
Held-to-maturity Securities 52,492     53,320
Mortgage-backed securities        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Cumulative OTTI reclassified (18)      
Available for sale debt securities 44,355     44,957
Held-to-maturity Securities 25,682     26,099
State and municipal securities        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Available for sale debt securities 9,837     8,765
Held-to-maturity Securities 7,653     8,897
Foreign government securities        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Available for sale debt securities 103,775     100,533
Held-to-maturity Securities 1,354     $ 740
Corporate        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Available for sale debt securities 12,996      
Other debt securities        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Available for sale debt securities 165      
AFS debt securities        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Beginning balance 48 $ 31    
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 (17) (1)    
Ending balance 31 30    
AFS debt securities | Mortgage-backed securities        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Beginning balance 38 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 (13) 0    
Ending balance 25 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    
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 (4) 0    
Ending balance 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    
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 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 (1)    
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 2 22    
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 2 22    
HTM debt securities        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Beginning balance 57 104    
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 (57) (4)    
Ending balance 0 100    
HTM debt securities | Mortgage-backed securities        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Beginning balance 54 101    
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 (54) (4)    
Ending balance 0 97    
HTM debt securities | State and municipal securities        
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward        
Beginning balance 3 3    
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 (3) 0    
Ending balance $ 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)