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INVESTMENTS - Securities Lending Transactions Accounted for as Secured Borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions $ 1,809 $ 2,162
Gross amount of recognized liabilities for securities lending 1,809 2,162
Japan government and agencies    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 1,087 920
Public utilities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 12 40
Sovereign and supranational    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 0 2
Banks/financial institutions    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 89 88
Other corporate    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 621 1,112
Maturity Overnight and Continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions [1] 722 1,242
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] 12 40
Maturity Overnight and Continuous | Sovereign and supranational    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions [1] 0 2
Maturity Overnight and Continuous | Banks/financial institutions    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions [1] 89 88
Maturity Overnight and Continuous | Other corporate    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions [1] 621 1,112
Maturity up to 30 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 1,087 920
Maturity up to 30 Days | Japan government and agencies    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending transactions 1,087 920
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 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] The related loaned security, under the Company's U.S. securities lending program, can be returned to the Company at the transferee's discretion; therefore, they are classified as Overnight and Continuous.