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INVESTMENTS - Securities Lending Accounted for as Secured Borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions $ 941 $ 2,193
Gross amount of recognized liabilities for securities lending 941 2,193
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 499 1,720
Public utilities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 108 80
Sovereign and supranational    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions   1
Banks/financial institutions    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 13 64
Other corporate    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 321 328
Maturity Overnight and Continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions [1] 442 473
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 0
Maturity Overnight and Continuous | Public utilities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions [1] 108 80
Maturity Overnight and Continuous | Sovereign and supranational    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions [1]   1
Maturity Overnight and Continuous | Banks/financial institutions    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions [1] 13 64
Maturity Overnight and Continuous | Other corporate    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions [1] 321 328
Maturity up to 30 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 499 1,720
Maturity up to 30 Days | Japan government and agencies    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 499 1,720
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 | Sovereign and supranational    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions   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
[1] These securities are pledged as collateral under our U.S. securities lending program and can be called at our discretion; therefore, they are classified as Overnight and Continuous.