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Financial Instruments - Schedule of Unrealized Loss Position (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Gross unrealized losses, less than 12 months $ (9) $ (1)
Estimate fair value, less than 12 months 3,601 931
Gross unrealized losses, 12 months or more (2) (3)
Estimated fair value, 12 months or more 271 283
Gross unrealized losses, total (11) (4)
Estimated fair value, total 3,872 1,214
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 1,023 111
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 1,023 111
U.S. treasury notes    
Debt Securities, Available-for-sale [Line Items]    
Gross unrealized losses, less than 12 months (3) (1)
Estimate fair value, less than 12 months 960 176
Gross unrealized losses, 12 months or more (2) (2)
Estimated fair value, 12 months or more 236 235
Gross unrealized losses, total (5) (3)
Estimated fair value, total 1,196 411
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Gross unrealized losses, less than 12 months (6) 0
Estimate fair value, less than 12 months 1,562 608
Gross unrealized losses, 12 months or more 0 (1)
Estimated fair value, 12 months or more 35 40
Gross unrealized losses, total (6) (1)
Estimated fair value, total 1,597 648
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 56 36
Gross unrealized losses, 12 months or more 0 0
Estimated fair value, 12 months or more 0 8
Gross unrealized losses, total 0 0
Estimated fair value, total $ 56 $ 44