v3.26.1
Financial Instruments - Schedule of Cash and Available-for-Sale Securities by Significant Investment Category (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost $ 1,723 $ 2,595 $ 1,279
Amortized Cost 5,202 5,533  
Level 1      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 1,723 2,595  
Estimated Fair Value 1,723 2,595  
Level 2      
Debt Securities, Available-for-sale [Line Items]      
Unrealized Gains 1 11  
Unrealized Losses (16) (4)  
Amortized Cost 6,925 8,128  
Estimated Fair Value 6,910 8,135  
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Estimated Fair Value 1,723 2,595  
Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesCurrent | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Estimated Fair Value 3,415 3,204  
Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesNoncurrent | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Estimated Fair Value 1,772 2,336  
Certificates of deposit | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 53 91  
Unrealized Gains 0 0  
Unrealized Losses 0 0  
Estimated Fair Value 53 91  
Certificates of deposit | Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesCurrent | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Estimated Fair Value 53 86  
Certificates of deposit | Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesNoncurrent | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Estimated Fair Value 0 5  
U.S. treasury bills | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 591 653  
Unrealized Gains 0 0  
Unrealized Losses (1) 0  
Estimated Fair Value 590 653  
U.S. treasury bills | Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesCurrent | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Estimated Fair Value 590 653  
U.S. treasury bills | Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesNoncurrent | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Estimated Fair Value 0 0  
U.S. treasury notes | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 2,132 2,188  
Unrealized Gains 0 5  
Unrealized Losses (9) (3)  
Estimated Fair Value 2,123 2,190  
U.S. treasury notes | Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesCurrent | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Estimated Fair Value 1,399 1,185  
U.S. treasury notes | Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesNoncurrent | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Estimated Fair Value 724 1,005  
Corporate debt securities | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 2,371 2,535  
Unrealized Gains 1 6  
Unrealized Losses (6) (1)  
Estimated Fair Value 2,366 2,540  
Corporate debt securities | Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesCurrent | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Estimated Fair Value 1,371 1,250  
Corporate debt securities | Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesNoncurrent | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Estimated Fair Value 995 1,290  
Government debt securities | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 55 66  
Unrealized Gains 0 0  
Unrealized Losses 0 0  
Estimated Fair Value 55 66  
Government debt securities | Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesCurrent | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Estimated Fair Value 2 30  
Government debt securities | Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesNoncurrent | Level 2      
Debt Securities, Available-for-sale [Line Items]      
Estimated Fair Value $ 53 $ 36