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Fair Value Measurements - Recurring (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Available-for-sale securities [Member] |  |
Fair Value |  |
Investment maturity | 10 years |
Fair Value, Recurring [Member] |  |
Fair Value |  |
Total assets measured at fair value | $ 899 | $ 571
Fair Value, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |
Fair Value |  |
Cash equivalents and money market funds | 269 | 56
Fair Value, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Equity securities [Member] |  |
Fair Value |  |
Investments | 79 | 70
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Available-for-sale securities [Member] |  |
Fair Value |  |
Investments | $ 551 | $ 445

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