v3.26.3
Marketable and Other Securities - Fair Value of Cash Equivalents and Marketable Debt Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities $ 9,945  
Total cash and cash equivalents 23,196 $ 20,945
Cash and cash equivalents 353 357
Total restricted cash 3,828 3,339
Due in one year or less 6,442  
Due between one and five years 3,504  
Total available-for-sale debt securities with contractual maturities 9,945  
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 4,609 6,724
Total available-for-sale debt securities with contractual maturities 4,609 6,724
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | Level 2 | U.S. government and agencies    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 537 2,370
Total available-for-sale debt securities with contractual maturities 537 2,370
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | Level 2 | Mortgage and asset-backed    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 444 558
Total available-for-sale debt securities with contractual maturities 444 558
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | Level 2 | Corporate debt and other    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 3,628 3,796
Total available-for-sale debt securities with contractual maturities 3,628 3,796
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue    
Summary of Investment Holdings [Line Items]    
Cash and time deposits 9,972 10,884
Total available-for-sale debt securities with contractual maturities 5,875 4,691
Total available-for-sale debt securities with contractual maturities 5,875 4,691
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 2 | U.S. government and agencies    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 263 451
Total available-for-sale debt securities with contractual maturities 263 451
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 2 | Corporate debt    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 4,517 3,317
Total available-for-sale debt securities with contractual maturities 4,517 3,317
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 2 | Sovereign debt    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 1,095 923
Total available-for-sale debt securities with contractual maturities 1,095 923
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 1    
Summary of Investment Holdings [Line Items]    
Money market funds 7,349 5,369
Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent | Level 1    
Summary of Investment Holdings [Line Items]    
Money market funds $ 3,476 $ 2,981