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Financial Instruments - Available-for-sale Marketable Securities (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Marketable Securities [Line Items] |  |
Less than 12 months, fair value | $ 2,721 | $ 10,284
Less than 12 months, unrealized losses | (3) | (99)
12 months or greater, fair value | 3,129 | 12,786
12 months or greater, unrealized losses | (38) | (382)
Fair value | 5,850 | 23,070
Unrealized losses | (41) | (481)
U.S. government securities |  |
Marketable Securities [Line Items] |  |
Less than 12 months, fair value | 1,491 | 6,860
Less than 12 months, unrealized losses | (2) | (71)
12 months or greater, fair value | 1,570 | 4,330
12 months or greater, unrealized losses | (18) | (146)
Fair value | 3,061 | 11,190
Unrealized losses | (20) | (217)
U.S. government agency securities |  |
Marketable Securities [Line Items] |  |
Less than 12 months, fair value | 17 | 435
Less than 12 months, unrealized losses | 0 | (2)
12 months or greater, fair value | 25 | 2,083
12 months or greater, unrealized losses | 0 | (44)
Fair value | 42 | 2,518
Unrealized losses | 0 | (46)
Corporate debt securities |  |
Marketable Securities [Line Items] |  |
Less than 12 months, fair value | 1,213 | 2,989
Less than 12 months, unrealized losses | (1) | (26)
12 months or greater, fair value | 1,534 | 6,373
12 months or greater, unrealized losses | (20) | (192)
Fair value | 2,747 | 9,362
Unrealized losses | $ (21) | $ (218)

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