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Financial Instruments - Unrealized Loss Position (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale [Line Items] |  |
Gross unrealized losses, less than 12 months | $ (9) | $ (4)
Estimate fair value, less than 12 months | 3,454 | 1,369
Gross unrealized losses, 12 months or more | (85) | (147)
Estimated fair value, 12 months or more | 4,803 | 6,644
Gross unrealized losses, total | (94) | (151)
Estimated fair value, total | 8,257 | 8,013
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 | 1,282 | 25
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 | 1,282 | 25
U.S. treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross unrealized losses, less than 12 months | (5) | (3)
Estimate fair value, less than 12 months | 1,175 | 774
Gross unrealized losses, 12 months or more | (38) | (64)
Estimated fair value, 12 months or more | 2,164 | 2,983
Gross unrealized losses, total | (43) | (67)
Estimated fair value, total | 3,339 | 3,757
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross unrealized losses, less than 12 months | (4) | (1)
Estimate fair value, less than 12 months | 945 | 562
Gross unrealized losses, 12 months or more | (45) | (79)
Estimated fair value, 12 months or more | 2,523 | 3,518
Gross unrealized losses, total | (49) | (80)
Estimated fair value, total | 3,468 | 4,080
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 | 52 | 8
Gross unrealized losses, 12 months or more | (2) | (4)
Estimated fair value, 12 months or more | 116 | 143
Gross unrealized losses, total | (2) | (4)
Estimated fair value, total | $ 168 | $ 151

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