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Fair Value Measurements - Recurring (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Available-for-sale securities [Member] |  |
Fair Value |  |
Investment maturity | 10 years |
Fair Value, Measurements, Recurring [Member] |  |
Fair Value |  |
Total assets | $ 813 | $ 819
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |
Fair Value |  |
Cash equivalents and money market funds | 221 | 327
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Equity securities [Member] |  |
Fair Value |  |
Available-for-sale securities | 67 | 61
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Available-for-sale securities [Member] |  |
Fair Value |  |
Available-for-sale securities | $ 525 | $ 431

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