v3.26.1
Financial Instruments - Schedule of Amortized Cost, Unrealized Gains and Losses and Fair Value of Debt Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 10,131 $ 10,313
Unrealized Gains 1 12
Unrealized Losses (12) 0
Fair Value 10,120 10,325
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 34 593
Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesCurrent    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 521 528
Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 55  
Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndCashEquivalents    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 24 330
Balance Sheet Location [Axis]: us-gaap:RestrictedInvestments    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 9,486 8,874
U.S. government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 7,395 7,315
Unrealized Gains 0 8
Unrealized Losses (9) 0
Fair Value 7,386 7,323
U.S. government and agency securities | Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 8 40
U.S. government and agency securities | Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesCurrent    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 129 149
U.S. government and agency securities | Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 0  
U.S. government and agency securities | Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndCashEquivalents    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 6 304
U.S. government and agency securities | Balance Sheet Location [Axis]: us-gaap:RestrictedInvestments    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 7,243 6,830
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 324 715
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 324 715
Commercial paper | Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 26 553
Commercial paper | Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesCurrent    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 77 75
Commercial paper | Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 0  
Commercial paper | Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndCashEquivalents    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 10 0
Commercial paper | Balance Sheet Location [Axis]: us-gaap:RestrictedInvestments    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 211 87
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,269 2,190
Unrealized Gains 1 4
Unrealized Losses (3) 0
Fair Value 2,267 2,194
Corporate bonds | Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 0 0
Corporate bonds | Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesCurrent    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 253 271
Corporate bonds | Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 55  
Corporate bonds | Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndCashEquivalents    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 8 26
Corporate bonds | Balance Sheet Location [Axis]: us-gaap:RestrictedInvestments    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 1,951 1,897
Certificates of deposit    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 81 71
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 81 71
Certificates of deposit | Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 0 0
Certificates of deposit | Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesCurrent    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 32 33
Certificates of deposit | Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 0  
Certificates of deposit | Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndCashEquivalents    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 0 0
Certificates of deposit | Balance Sheet Location [Axis]: us-gaap:RestrictedInvestments    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 49 38
Mortgage-backed and asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 62 22
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 62 22
Mortgage-backed and asset-backed securities | Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 0 0
Mortgage-backed and asset-backed securities | Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesCurrent    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 30 0
Mortgage-backed and asset-backed securities | Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 0  
Mortgage-backed and asset-backed securities | Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndCashEquivalents    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 0 0
Mortgage-backed and asset-backed securities | Balance Sheet Location [Axis]: us-gaap:RestrictedInvestments    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 32 $ 22