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Fair Value of Financial Instruments - Additional Information (Detail) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
Fair Value of Financial Instruments [Line Items] |  |
Available-for-sale debt securities | $ 45,233 | $ 46,781
Period end valuation | 0 |
U.S. corporate |  |
Fair Value of Financial Instruments [Line Items] |  |
Available-for-sale debt securities | $ 26,813 | 27,985
Non-U.S. corporate |  |
Fair Value of Financial Instruments [Line Items] |  |
Available-for-sale debt securities | 7,636 | 7,811
Level 2 | Other invested assets | Nonrecurring fair value |  |
Fair Value of Financial Instruments [Line Items] |  |
Real estate owned | $ 24 | $ 23
Level 2 | Fixed maturity securities | Third-Party Pricing Services |  |
Fair Value of Financial Instruments [Line Items] |  |
Percentage of available for sale debt securities | 88.00% |
Level 2 | Fixed maturity securities | Third-Party Pricing Services | U.S. corporate |  |
Fair Value of Financial Instruments [Line Items] |  |
Available-for-sale debt securities | $ 23,287 |
Level 2 | Fixed maturity securities | Third-Party Pricing Services | Non-U.S. corporate |  |
Fair Value of Financial Instruments [Line Items] |  |
Available-for-sale debt securities | 5,976 |
Level 2 | Fixed maturity securities | Internal models | U.S. corporate |  |
Fair Value of Financial Instruments [Line Items] |  |
Available-for-sale debt securities | 1,542 |
Level 2 | Fixed maturity securities | Internal models | Non-U.S. corporate |  |
Fair Value of Financial Instruments [Line Items] |  |
Available-for-sale debt securities | 849 |
Level 3 | Fixed maturity securities | Internal models |  |
Fair Value of Financial Instruments [Line Items] |  |
Available-for-sale debt securities | 2,781 |
Level 3 | Fixed maturity securities | Broker Quotes |  |
Fair Value of Financial Instruments [Line Items] |  |
Available-for-sale debt securities | $ 205 |
Fair Value Measured at Net Asset Value Per Share | Limited Partnerships | Maximum |  |
Fair Value of Financial Instruments [Line Items] |  |
Liquidation period | 10 years |
Contractual period | 12 years |
Fair Value Measured at Net Asset Value Per Share | Limited Partnerships | Minimum |  |
Fair Value of Financial Instruments [Line Items] |  |
Liquidation period | 5 years |
Contractual period | 10 years |

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- Definition Percent of total fixed maturity securities portfolio priced using third-party pricing sources in determining fair value. + References No definition available. + Details
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- Definition Amount of 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 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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