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Financial Instruments - Schedule of Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value $ 7,456 $ 8,135
Certificates of deposit | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 61 91
U.S. treasury bills | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 610 653
U.S. treasury notes | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 2,226 2,190
Corporate debt securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 2,595 2,540
Government debt securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 56 66
Fair Value, Recurring    
Debt Securities, Available-for-sale [Line Items]    
Derivative instruments 8 1
Total 7,067 7,925
Derivative instruments   4
Fair Value, Recurring | Level 1    
Debt Securities, Available-for-sale [Line Items]    
Derivative instruments 0 0
Total 597 969
Derivative instruments   0
Fair Value, Recurring | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Derivative instruments 8 1
Total 6,470 6,956
Derivative instruments   4
Fair Value, Recurring | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 595 963
Fair Value, Recurring | Money market funds | Level 1    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 595 963
Fair Value, Recurring | Money market funds | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 0 0
Fair Value, Recurring | Certificates of deposit    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 61 91
Fair Value, Recurring | Certificates of deposit | Level 1    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 0 0
Fair Value, Recurring | Certificates of deposit | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 61 91
Fair Value, Recurring | U.S. treasury bills    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 1,141 1,445
Fair Value, Recurring | U.S. treasury bills | Level 1    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 0 0
Fair Value, Recurring | U.S. treasury bills | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 1,141 1,445
Fair Value, Recurring | U.S. treasury notes    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 2,226 2,190
Fair Value, Recurring | U.S. treasury notes | Level 1    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 0 0
Fair Value, Recurring | U.S. treasury notes | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 2,226 2,190
Fair Value, Recurring | Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 2,978 3,163
Fair Value, Recurring | Corporate debt securities | Level 1    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 0 0
Fair Value, Recurring | Corporate debt securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 2,978 3,163
Fair Value, Recurring | Government debt securities    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 56 66
Fair Value, Recurring | Government debt securities | Level 1    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 0 0
Fair Value, Recurring | Government debt securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 56 66
Fair Value, Recurring | Equity investments    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 2 6
Fair Value, Recurring | Equity investments | Level 1    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 2 6
Fair Value, Recurring | Equity investments | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value $ 0 $ 0