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Supplementary Information for Certain Balance Sheet Accounts - Deferred Revenue and Accrued Expenses (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Accounts payable, accrued liabilities and deferred revenue | $ 962 | $ 1,053
Accrued discretionary and incentive compensation | 588 | 835
Accrued vacation | 202 | 154
Accrued 401(k) contributions | 43 | 63
Other employee-related liabilities | 73 | 106
Total deferred revenue and accrued expenses | $ 1,868 | $ 2,211

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