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INVESTMENTS (OFFSETTING 1) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Offsetting Assets [Line Items]      
Interest Expense, Securities Sold under Agreements to Repurchase $ 5 $ 4  
Securities sold under agreements to repurchase 1,887 1,996  
Expense in securities sold under agreement to repurchase 3   $ 4
Derivative investments      
Offsetting Assets [Line Items]      
Fair Value of Assets 1,954 54  
Collateral (Received)/Held, Financial Instruments 0 0  
Collateral (Received)/Held, Cash (1,828) 70  
Net Amounts 126 124  
Securities sold under agreements to repurchase 0    
Collateral (Received)/Held, Financial Instruments 0    
Collateral (Received)/Held, Cash 0    
Net amounts 0    
Other financial instruments      
Offsetting Assets [Line Items]      
Fair Value of Assets 2,995 2,102  
Collateral (Received)/Held, Financial Instruments 0 0  
Collateral (Received)/Held, Cash 0 0  
Net Amounts 2,995 2,102  
Securities sold under agreements to repurchase 2,663    
Collateral (Received)/Held, Financial Instruments 0    
Collateral (Received)/Held, Cash 0    
Net amounts 2,663    
Other investment income      
Offsetting Assets [Line Items]      
Fair Value of Assets 4,949 2,156  
Collateral (Received)/Held, Financial Instruments 0 0  
Collateral (Received)/Held, Cash (1,828) 70  
Net Amounts 3,121 2,226  
Securities sold under agreement to repurchase(3)      
Offsetting Assets [Line Items]      
Securities sold under agreements to repurchase   1,992  
Collateral (Received)/Held, Financial Instruments   (1,986)  
Collateral (Received)/Held, Cash   (2)  
Net amounts   $ 4  
Other liabilities      
Offsetting Assets [Line Items]      
Securities sold under agreements to repurchase 2,663    
Collateral (Received)/Held, Financial Instruments 0    
Collateral (Received)/Held, Cash 0    
Net amounts 2,663    
Securities sold under agreement to repurchase(3)      
Offsetting Assets [Line Items]      
Securities sold under agreements to repurchase 1,882    
Collateral (Received)/Held, Financial Instruments (1,988)    
Collateral (Received)/Held, Cash (21)    
Net amounts $ (127)