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Schedule I - Summary Of Investments - Other Than Investments In Related Parties (Detail) $ in Millions | Dec. 31, 2021 USD ($)
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Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | $ 10,135 |
Market value | 10,628 |
Amount at which shown in the balance sheet | 10,628 |
Short-term Investments |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 58 |
Market value | 58 |
Amount at which shown in the balance sheet | 58 |
U.S. Treasury bonds |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 123 |
Market value | 123 |
Amount at which shown in the balance sheet | 123 |
Municipal bonds |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 1,607 |
Market value | 1,649 |
Amount at which shown in the balance sheet | 1,649 |
Foreign government bonds |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 228 |
Market value | 227 |
Amount at which shown in the balance sheet | 227 |
Governmental agency bonds |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 175 |
Market value | 177 |
Amount at which shown in the balance sheet | 177 |
Governmental agency mortgage-backed securities |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 5,620 |
Market value | 5,607 |
Amount at which shown in the balance sheet | 5,607 |
U.S. corporate debt securities |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 1,071 |
Market value | 1,081 |
Amount at which shown in the balance sheet | 1,081 |
Foreign corporate debt securities |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 493 |
Market value | 498 |
Amount at which shown in the balance sheet | 498 |
Debt Securities |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 9,317 |
Market value | 9,362 |
Amount at which shown in the balance sheet | 9,362 |
Equity Securities, Investment Summary |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 728 |
Market value | 1,176 | [1]
Amount at which shown in the balance sheet | 1,176 |
Notes Receivable |  |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |  |
Cost | 32 |
Market value | 32 |
Amount at which shown in the balance sheet | $ 32 |
[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 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 No definition available. + Details
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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 http://asc.fasb.org/extlink&oid=122147990&loc=d3e611379-123010 + Details
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