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Assets and Liabilities Measured at Fair Value (Tables) | 3 Months Ended
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Mar. 31, 2024
Fair Value Disclosures [Abstract] |
Summary of Investments of Insurance Subsidiaries Measured at Fair Value on Recurring Basis | The following tables summarize the investments of our insurance subsidiaries measured at fair value on a recurring basis as of March 31, 2024 and December 31, 2023, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):
|  | March 31, 2024 |
|  |  |  |  | Fair Value Measurements Using |
|  | Fair Value |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Debt securities |  | $ | 372 |  |  | $ | — |  |  | $ | 372 |  |  | $ | — |
Money market funds and other |  |  | 194 |  |  |  | 194 |  |  |  | — |  |  |  | — |
Investments of insurance subsidiaries |  |  | 566 |  |  |  | 194 |  |  |  | 372 |  |  |  | — |
Less amounts classified as current assets |  |  | (95 | ) |  |  | (95 | ) |  |  | — |  |  |  | — |
|  | $ | 471 |  |  | $ | 99 |  |  | $ | 372 |  |  | $ | — |
|  | December 31, 2023 |
|  |  |  |  | Fair Value Measurements Using |
|  | Fair Value |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Debt securities |  | $ | 376 |  |  | $ | — |  |  | $ | 376 |  |  | $ | — |
Money market funds and other |  |  | 188 |  |  |  | 188 |  |  |  | — |  |  |  | — |
Investments of insurance subsidiaries |  |  | 564 |  |  |  | 188 |  |  |  | 376 |  |  |  | — |
Less amounts classified as current assets |  |  | (87 | ) |  |  | (87 | ) |  |  | — |  |  |  | — |
|  | $ | 477 |  |  | $ | 101 |  |  | $ | 376 |  |  | $ | — |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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