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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