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Investments - Pledged Investments (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Fixed maturity securities available for sale | $ 0 | $ 106
Amounts borrowed under repurchase and securities lending agreements | 0 | 107
Securities pledged under repurchase agreements |  | 106
Securities collateral pledged to us | 2,853 | 1,200
Carrying value of reverse repurchase agreements | 2,800 | 1,100
Total carrying values of cash and securities deposited under requirements of regulatory authorities or other insurance-related arrangements | 7,800 | 8,400
Federal Home Loan Bank stock | 13 | 15
Bonds available for sale and short-term investments held in escrow | 73 | 164
Asset Pledged as Collateral |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Fixed maturity securities available for sale | $ 1,600 | 1,700
Non-U.S. governments |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Securities pledged under repurchase agreements |  | 106
Corporate debt |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Securities pledged under repurchase agreements |  | 0
Overnight and Continuous |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Securities pledged under repurchase agreements |  | 0
Overnight and Continuous | Non-U.S. governments |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Securities pledged under repurchase agreements |  | 0
Overnight and Continuous | Corporate debt |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Securities pledged under repurchase agreements |  | 0
up to 30 days |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Securities pledged under repurchase agreements |  | 106
up to 30 days | Non-U.S. governments |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Securities pledged under repurchase agreements |  | 106
up to 30 days | Corporate debt |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Securities pledged under repurchase agreements |  | 0
31 - 90 days |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Securities pledged under repurchase agreements |  | 0
31 - 90 days | Non-U.S. governments |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Securities pledged under repurchase agreements |  | 0
31 - 90 days | Corporate debt |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Securities pledged under repurchase agreements |  | 0
91 - 364 days |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Securities pledged under repurchase agreements |  | 0
91 - 364 days | Non-U.S. governments |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Securities pledged under repurchase agreements |  | 0
91 - 364 days | Corporate debt |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Securities pledged under repurchase agreements |  | 0
365 days or greater |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Securities pledged under repurchase agreements |  | 0
365 days or greater | Non-U.S. governments |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Securities pledged under repurchase agreements |  | 0
365 days or greater | Corporate debt |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Securities pledged under repurchase agreements |  | $ 0

X
- Definition Amount, after the effects of master netting arrangements, of 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 and of securities loaned to entities in exchange for collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References No definition available. + Details
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- Definition Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 825 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147477351/944-825-50-1A + Details
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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 210 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477220/954-210-45-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478600/954-210-50-2 + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 325 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477974/942-325-45-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(11)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481444/860-30-45-1 + Details
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- Definition This element represents the current portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 210 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477220/954-210-45-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478600/954-210-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the assets received as collateral against securities loaned to other broker-dealers. Borrowers of securities generally are required to provide collateral to the lenders of securities, commonly cash but sometimes other securities or standby letters of credit, with a value slightly higher than that of the securities borrowed. In instances where the entity is permitted to sell or re-pledge these securities, the entity reports the fair value of the collateral received and the related obligation to return the collateral as a liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (b)(1) -SubTopic 30 -Topic 860 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A + Details
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- Definition Fair value of securities pledged as collateral against securities sold under agreement to repurchase. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-12 + Details
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