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INVESTMENTS - Securities Lending Transactions Accounted for as Secured Borrowings (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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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 |  | $ 3,366 | $ 1,503
Gross amount of recognized liabilities for securities lending |  | 3,366 | 1,503
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 |  | 2,542 | 737
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 |  | 33 | 19
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 |  | 148 | 72
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 |  | 643 | 675
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] | 824 | 766
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] | 33 | 19
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] | 148 | 72
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] | 643 | 675
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 |  | 2,542 | 737
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 |  | 2,542 | 737
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 | 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
[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 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -SubTopic 20 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483466/210-20-50-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481420/860-30-50-7 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481420/860-30-50-7 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a)(1) -SubTopic 30 -Topic 860 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481420/860-30-50-7 + Details
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