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Financial Instruments - Available-for-sale Marketable Securities (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Marketable Securities [Line Items] |  |
Less than 12 months, fair value | $ 51,395 | $ 2,721
Less than 12 months, unrealized losses | (155) | (3)
12 months or greater, fair value | 811 | 3,129
12 months or greater, unrealized losses | (8) | (38)
Fair value | 52,206 | 5,850
Unrealized losses | (163) | (41)
U.S. government securities |  |
Marketable Securities [Line Items] |  |
Less than 12 months, fair value | 38,575 | 1,491
Less than 12 months, unrealized losses | (107) | (2)
12 months or greater, fair value | 212 | 1,570
12 months or greater, unrealized losses | (3) | (18)
Fair value | 38,787 | 3,061
Unrealized losses | (110) | (20)
U.S. government agency securities |  |
Marketable Securities [Line Items] |  |
Less than 12 months, fair value | 407 | 17
Less than 12 months, unrealized losses | (3) | 0
12 months or greater, fair value | 25 | 25
12 months or greater, unrealized losses | 0 | 0
Fair value | 432 | 42
Unrealized losses | (3) | 0
Corporate debt securities |  |
Marketable Securities [Line Items] |  |
Less than 12 months, fair value | 12,413 | 1,213
Less than 12 months, unrealized losses | (45) | (1)
12 months or greater, fair value | 574 | 1,534
12 months or greater, unrealized losses | (5) | (20)
Fair value | 12,987 | 2,747
Unrealized losses | $ (50) | $ (21)

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