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Financial Instruments - Schedule of Unrealized Loss Position (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025
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Debt Securities, Available-for-sale [Line Items] |  |
Gross unrealized losses, less than 12 months | $ (9) | $ (1)
Estimate fair value, less than 12 months | 3,601 | 931
Gross unrealized losses, 12 months or more | (2) | (3)
Estimated fair value, 12 months or more | 271 | 283
Gross unrealized losses, total | (11) | (4)
Estimated fair value, total | 3,872 | 1,214
U.S. treasury bills |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross unrealized losses, less than 12 months | 0 | 0
Estimate fair value, less than 12 months | 1,023 | 111
Gross unrealized losses, 12 months or more | 0 | 0
Estimated fair value, 12 months or more | 0 | 0
Gross unrealized losses, total | 0 | 0
Estimated fair value, total | 1,023 | 111
U.S. treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross unrealized losses, less than 12 months | (3) | (1)
Estimate fair value, less than 12 months | 960 | 176
Gross unrealized losses, 12 months or more | (2) | (2)
Estimated fair value, 12 months or more | 236 | 235
Gross unrealized losses, total | (5) | (3)
Estimated fair value, total | 1,196 | 411
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross unrealized losses, less than 12 months | (6) | 0
Estimate fair value, less than 12 months | 1,562 | 608
Gross unrealized losses, 12 months or more | 0 | (1)
Estimated fair value, 12 months or more | 35 | 40
Gross unrealized losses, total | (6) | (1)
Estimated fair value, total | 1,597 | 648
Government debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross unrealized losses, less than 12 months | 0 | 0
Estimate fair value, less than 12 months | 56 | 36
Gross unrealized losses, 12 months or more | 0 | 0
Estimated fair value, 12 months or more | 0 | 8
Gross unrealized losses, total | 0 | 0
Estimated fair value, total | $ 56 | $ 44

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