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INVESTMENTS - Securities Lending Transactions Accounted for as Secured Borrowings (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
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 |  | $ 2,721 | $ 2,162
Gross amount of recognized liabilities for securities lending |  | 2,721 | 2,162
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 |  | 1,874 | 920
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 |  | 23 | 40
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 | 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 |  | 96 | 88
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 |  | 727 | 1,112
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
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] | 847 | 1,242
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] | 23 | 40
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] | 0 | 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] | 96 | 88
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] | 727 | 1,112
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] | 1 | 0
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 |  | 1,874 | 920
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 |  | 1,874 | 920
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 | 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 | 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
[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.

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- Definition Amount, before effects of master netting arrangements, of securities loaned to entities in exchange for collateral and funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=109249958&loc=SL34722452-111729 + Details
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- Definition Amount, before effects of master netting arrangements, of financial assets loaned to entities in exchange for collateral. Includes liabilities not subject to a master netting arrangement and financial assets transferred other than securities that qualify as secured borrowings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=109249958&loc=SL34722452-111729 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=109249958&loc=SL34722452-111729 + Details
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