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INVESTMENTS - Securities Lending Transactions Accounted for as Secured Borrowings (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | $ 6,635 | $ 2,242
Gross amount of recognized liabilities for securities lending |  | 1,876 | 1,052
Amounts related to agreements not included in offsetting disclosure in Note 4 |  | 4,759 | 1,190
Japan government and agencies |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 5,772 | 1,577
Public utilities |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 35 | 27
Municipalities |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  |  | 5
Sovereign and supranational |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 2 |
Banks/financial institutions |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 48 | 74
Other corporate |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 778 | 549
Equity securities |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 0 | 10
Maturity Overnight and Continuous |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | [1] | 863 | 665
Maturity Overnight and Continuous | Japan government and agencies |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | [1] | 0 | 0
Maturity Overnight and Continuous | Public utilities |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | [1] | 35 | 27
Maturity Overnight and Continuous | Municipalities |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | [1] |  | 5
Maturity Overnight and Continuous | Sovereign and supranational |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | [1] | 2 |
Maturity Overnight and Continuous | Banks/financial institutions |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | [1] | 48 | 74
Maturity Overnight and Continuous | Other corporate |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | [1] | 778 | 549
Maturity Overnight and Continuous | Equity securities |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | [1] | 0 | 10
Maturity up to 30 Days |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 1,013 | 387
Maturity up to 30 Days | Japan government and agencies |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 1,013 | 387
Maturity up to 30 Days | Public utilities |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 0 | 0
Maturity up to 30 Days | Municipalities |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  |  | 0
Maturity up to 30 Days | Sovereign and supranational |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 0 |
Maturity up to 30 Days | Banks/financial institutions |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 0 | 0
Maturity up to 30 Days | Other corporate |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 0 | 0
Maturity up to 30 Days | Equity securities |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 0 | 0
Maturity Greater than 90 Days |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 4,759 | 1,190
Maturity Greater than 90 Days | Japan government and agencies |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 4,759 | 1,190
Maturity Greater than 90 Days | Public utilities |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 0 | 0
Maturity Greater than 90 Days | Municipalities |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  |  | 0
Maturity Greater than 90 Days | Sovereign and supranational |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 0 |
Maturity Greater than 90 Days | Banks/financial institutions |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 0 | 0
Maturity Greater than 90 Days | Other corporate |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | 0 | 0
Maturity Greater than 90 Days | Equity securities |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred |  | $ 0 | $ 0
[1] | The related loaned security, under the Company's Aflac U.S. securities lending program, can be returned to the Company at the transferee's discretion; therefore, they are classified as Overnight and Continuous.

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