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Fair Value - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($) Item | Dec. 31, 2022 USD ($) Item | Dec. 31, 2021 USD ($)
Fair Value Disclosures [Line Items] |  |  |
Fair value, assets, level 1 to level 2 transfers, amount | $ 0 | $ 0 |
Fair value, assets, level 2 to level 1 transfers, amount | 0 | 0 |
Fair value, liabilities, level 1 to level 2 transfers, amount | 0 | 0 |
Fair value, liabilities, level 2 to level 1 transfers, amount | 0 | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 145,000,000 | $ 169,000,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | Item | 306 | 348 |
Other Investment Income |  |  |
Fair Value Disclosures [Line Items] |  |  |
Investment Income, Interest and Dividend | $ 7,000,000 | $ 6,000,000 | $ 5,000,000
Available-for-sale Securities |  |  |
Fair Value Disclosures [Line Items] |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | $ 0 |  |

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- Definition Available for sale securities fair value continuous unrealized loss position. + References No definition available. + Details
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- Definition Available for sale securities in unrealized loss positions qualitative number of positions. + References No definition available. + Details
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- Definition Fair value assets level 1 to level 2 transfer amount. + References No definition available. + Details
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- Definition Fair value assets level 2 to level 1 transfer amount. + References No definition available. + Details
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- Definition Fair value liabilities level 1 to level 2 transfer amount. + References No definition available. + Details
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- Definition Fair value liabilities level 2 to level 1 transfer amount. + References No definition available. + Details
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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a),(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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- Definition The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity). + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-8B Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8B -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-8B + Details
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