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Financial Instruments and Fair Value Measurements - Unrealized Loss Position (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Gross unrealized losses, less than 12 months | $ (1) | $ (6)
Estimated fair value, less than 12 months | 931 | 1,673
Gross unrealized losses, 12 months or more | (3) | (22)
Estimated fair value, 12 months or more | 283 | 2,643
Gross Unrealized Losses, Total | (4) | (28)
Estimated Fair Value, Total | 1,214 | 4,316
U.S. treasury bills |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross unrealized losses, less than 12 months | 0 | 0
Estimated fair value, less than 12 months | 111 | 101
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 | 111 | 101
U.S. treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross unrealized losses, less than 12 months | (1) | (2)
Estimated fair value, less than 12 months | 176 | 729
Gross unrealized losses, 12 months or more | (2) | (13)
Estimated fair value, 12 months or more | 235 | 960
Gross Unrealized Losses, Total | (3) | (15)
Estimated Fair Value, Total | 411 | 1,689
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross unrealized losses, less than 12 months | 0 | (4)
Estimated fair value, less than 12 months | 608 | 843
Gross unrealized losses, 12 months or more | (1) | (9)
Estimated fair value, 12 months or more | 40 | 1,646
Gross Unrealized Losses, Total | (1) | (13)
Estimated Fair Value, Total | 648 | 2,489
Government debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross unrealized losses, less than 12 months | 0 | 0
Estimated fair value, less than 12 months | 36 | 0
Gross unrealized losses, 12 months or more | 0 | 0
Estimated fair value, 12 months or more | 8 | 37
Gross Unrealized Losses, Total | 0 | 0
Estimated Fair Value, Total | $ 44 | $ 37

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