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INVESTMENTS - Cumulative OTTI Credit Losses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Jan. 01, 2018
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Held to maturity securities $ (68,693)   $ (68,693)   $ (63,357)  
Available for sale debt securities 273,435   273,435   288,038  
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 (40,570)   (40,570)   (35,946)  
Available for sale debt securities 38,885   38,885   44,505  
State and municipal securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Held to maturity securities (7,892)   (7,892)   (7,628)  
Available for sale debt securities 6,170   6,170   9,206  
Foreign government securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Held to maturity securities (1,920)   (1,920)   (1,027)  
Available for sale debt securities 101,740   101,740   100,691  
Corporate            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Available for sale debt securities 12,323   12,323   11,599  
Other debt securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Available for sale debt securities 4,190   4,190   $ 3,972  
AFS debt securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Beginning balance 5 31 5 48    
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 (24) 0 (41)    
Ending balance 5 7 5 7    
AFS debt securities | Mortgage-backed securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Beginning balance 1 25 1 38    
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 (24) 0 (37)    
Ending balance 1 1 1 1    
AFS debt securities | State and municipal securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Beginning balance 0 0 0 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 0 (4)    
Ending balance 0 0 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 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 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 0 0    
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 0 2 0 2    
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 2 0 2    
HTM debt securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Beginning balance 0 0 0 57    
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 (57)    
Ending balance 0 0 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 0 54    
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 (54)    
Ending balance 0 0 0 0    
HTM debt securities | State and municipal securities            
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward            
Beginning balance 0 0 0 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 0 (3)    
Ending balance $ 0 $ 0 $ 0 $ 0    
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