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INVESTMENTS - Securities Lending Accounted for as Secured Borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions $ 606 $ 526
Gross amount of recognized liabilities for securities lending 606 526
Amounts related to agreements not included in offsetting disclosure in Note 4 0 0
Japan government and agencies    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 49  
Public utilities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 73 62
Banks/financial institutions    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 54 34
Other corporate    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 415 430
Equity securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 15  
Maturity Overnight and Continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions [1] 557 526
Maturity Overnight and Continuous | Japan government and agencies    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions [1] 0  
Maturity Overnight and Continuous | Public utilities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions [1] 73 62
Maturity Overnight and Continuous | Banks/financial institutions    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions [1] 54 34
Maturity Overnight and Continuous | Other corporate    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions [1] 415 430
Maturity Overnight and Continuous | Equity securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions [1] 15  
Maturity up to 30 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 49 0
Maturity up to 30 Days | Japan government and agencies    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 49  
Maturity up to 30 Days | Public utilities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 0 0
Maturity up to 30 Days | Banks/financial institutions    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 0 0
Maturity up to 30 Days | Other corporate    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 0 $ 0
Maturity up to 30 Days | Equity securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions $ 0  
[1] These securities are pledged as collateral under the Company's U.S. securities lending program and can be called at its discretion; therefore, they are classified as Overnight and Continuous.