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Marketable and Other Securities - Fair Value of Cash Equivalents and Marketable Debt Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities $ 11,675  
Total cash and cash equivalents 22,910 $ 19,872
Cash and cash equivalents 338 294
Total restricted cash 3,300 3,092
Due in one year or less 6,683  
Due between one and five years 4,992  
Total available-for-sale debt securities with contractual maturities 11,675  
Cash and cash equivalents    
Summary of Investment Holdings [Line Items]    
Cash and time deposits 11,946 12,471
Total available-for-sale debt securities with contractual maturities 5,480 2,351
Total available-for-sale debt securities with contractual maturities 5,480 2,351
Cash and cash equivalents | Level 2 | U.S. government and agencies    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 808 26
Total available-for-sale debt securities with contractual maturities 808 26
Cash and cash equivalents | Level 2 | Corporate debt    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 3,749 1,541
Total available-for-sale debt securities with contractual maturities 3,749 1,541
Cash and cash equivalents | Level 2 | Sovereign debt    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 924 785
Total available-for-sale debt securities with contractual maturities 924 785
Cash and cash equivalents | Level 1    
Summary of Investment Holdings [Line Items]    
Money market funds 5,484 5,050
Marketable debt securities    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 6,792 7,265
Total available-for-sale debt securities with contractual maturities 6,792 7,265
Marketable debt securities | Level 2 | U.S. government and agencies    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 2,479 3,082
Total available-for-sale debt securities with contractual maturities 2,479 3,082
Marketable debt securities | Level 2 | Mortgage and asset-backed    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 548 591
Total available-for-sale debt securities with contractual maturities 548 591
Marketable debt securities | Level 2 | Corporate debt and other    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 3,765 3,592
Total available-for-sale debt securities with contractual maturities 3,765 3,592
Other Current Assets | Level 1    
Summary of Investment Holdings [Line Items]    
Money market funds $ 2,962 $ 2,798