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Investments - Schedule of Securities Pledged by Contractual Maturity (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | $ 155 | $ 157
Total gross secured borrowings | 573 | 157
Repurchase Agreements |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 418 |
Corporate bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 143 | 144
State and municipal bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 4 |
U.S. government bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements |  | 1
Foreign government bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 2 |
Equity securities |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 6 | 12
Overnight and Continuous |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total gross secured borrowings | 155 | 157
Overnight and Continuous | Repurchase Agreements |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 0 |
Overnight and Continuous | Corporate bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 143 | 144
Overnight and Continuous | State and municipal bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 4 |
Overnight and Continuous | U.S. government bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements |  | 1
Overnight and Continuous | Foreign government bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 2 |
Overnight and Continuous | Equity securities |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 6 | 12
Up to 30 Days |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total gross secured borrowings | 0 | 0
Up to 30 Days | Repurchase Agreements |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 0 |
Up to 30 Days | Corporate bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 0 | 0
Up to 30 Days | State and municipal bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 0 |
Up to 30 Days | U.S. government bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements |  | 0
Up to 30 Days | Foreign government bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 0 |
Up to 30 Days | Equity securities |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 0 | 0
30-90 Days |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total gross secured borrowings | 0 | 0
30-90 Days | Repurchase Agreements |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 0 |
30-90 Days | Corporate bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 0 | 0
30-90 Days | State and municipal bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 0 |
30-90 Days | U.S. government bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements |  | 0
30-90 Days | Foreign government bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 0 |
30-90 Days | Equity securities |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 0 | 0
Greater Than 90 Days |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total gross secured borrowings | 418 | 0
Greater Than 90 Days | Repurchase Agreements |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 418 |
Greater Than 90 Days | Corporate bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 0 | 0
Greater Than 90 Days | State and municipal bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 0 |
Greater Than 90 Days | U.S. government bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements |  | 0
Greater Than 90 Days | Foreign government bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | 0 |
Greater Than 90 Days | Equity securities |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities pledged under securities lending agreements | $ 0 | $ 0

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- Definition Amount, before effects of master netting arrangements, of financial assets loaned to entities in exchange for collateral and funds outstanding borrowed in the form of a financial asset repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same financial assets at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481395/860-30-55-4 Reference 2: 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 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-7 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -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/exampleRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481395/860-30-55-4 Reference 2: 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 3: 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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