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Investments - Summary of Investments (Detail) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Total | $ 6,303 | $ 7,576
Gross Unrealized Gains | 40 | 18
Gross Unrealized Losses | (14) | (25)
Estimated Fair Value | 6,329 | 7,569
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Total | 173 | 336
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 173 | 336
Corporate notes and bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Total | 4,759 | 4,966
Gross Unrealized Gains | 34 | 15
Gross Unrealized Losses | 0 | (5)
Estimated Fair Value | 4,793 | 4,976
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Total | 11 | 67
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 11 | 67
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Total | 1,257 | 2,103
Gross Unrealized Gains | 6 | 3
Gross Unrealized Losses | 0 | (2)
Estimated Fair Value | 1,263 | 2,104
Mortgage-backed and asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Total | 103 | 104
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (14) | (18)
Estimated Fair Value | $ 89 | $ 86

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