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Schedule I - Summary Of Investments - Other Than Investments In Related Parties (Detail) $ in Millions | Dec. 31, 2022 USD ($)
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Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | $ 9,968 |
Market value | 8,997 |
Amount at which shown in the balance sheet | 8,998 |
Short-term Investments |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 63 |
Market value | 62 |
Amount at which shown in the balance sheet | 63 |
U.S. Treasury bonds |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 309 |
Market value | 303 |
Amount at which shown in the balance sheet | 303 |
Municipal bonds |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 1,671 |
Market value | 1,479 |
Amount at which shown in the balance sheet | 1,479 |
Foreign government bonds |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 208 |
Market value | 194 |
Amount at which shown in the balance sheet | 194 |
Governmental agency bonds |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 248 |
Market value | 229 |
Amount at which shown in the balance sheet | 229 |
Governmental agency mortgage-backed securities |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 5,253 |
Market value | 4,601 |
Amount at which shown in the balance sheet | 4,601 |
U.S. corporate debt securities |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 1,004 |
Market value | 921 |
Amount at which shown in the balance sheet | 921 |
Foreign corporate debt securities |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 477 |
Market value | 443 |
Amount at which shown in the balance sheet | 443 |
Debt Securities |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 9,170 |
Market value | 8,170 |
Amount at which shown in the balance sheet | 8,170 |
Equity Securities, Investment Summary |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 724 |
Market value | 754 | [1]
Amount at which shown in the balance sheet | 754 |
Notes Receivable |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 11 |
Market value | 11 |
Amount at which shown in the balance sheet | $ 11 |
[1] | Included in equity securities are non-marketable equity securities and equity method investments. Estimates of fair value for these investments could not be made without incurring excessive costs.

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- Definition Amount of investment held by insurance company, excluding investment in related party. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15(Column D)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611379-123010 + Details
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