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Marketable and Other Securities - Fair Value of Cash Equivalents and Marketable Debt Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities $ 15,594  
Total cash and cash equivalents 23,744 $ 18,853
Cash and cash equivalents 275 277
Total restricted cash 2,971 3,064
Due in one year or less 9,824  
Due between one and five years 5,770  
Total available-for-sale debt securities with contractual maturities 15,594  
Cash and cash equivalents    
Summary of Investment Holdings [Line Items]    
Cash and time deposits 12,296 8,977
Total available-for-sale debt securities with contractual maturities 7,901 2,384
Total available-for-sale debt securities with contractual maturities 7,901 2,384
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 76 211
Total available-for-sale debt securities with contractual maturities 76 211
Cash and cash equivalents | Level 2 | Corporate debt    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 5,160 1,439
Total available-for-sale debt securities with contractual maturities 5,160 1,439
Cash and cash equivalents | Level 2 | Sovereign debt    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 2,665 734
Total available-for-sale debt securities with contractual maturities 2,665 734
Cash and cash equivalents | Level 1    
Summary of Investment Holdings [Line Items]    
Money market funds 3,547 7,491
Marketable debt securities    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 8,477 7,613
Total available-for-sale debt securities with contractual maturities 8,477 7,613
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 3,477 3,495
Total available-for-sale debt securities with contractual maturities 3,477 3,495
Marketable debt securities | Level 2 | Mortgage and asset-backed    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 636 589
Total available-for-sale debt securities with contractual maturities 636 589
Marketable debt securities | Level 2 | Corporate debt and other    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 4,364 3,529
Total available-for-sale debt securities with contractual maturities 4,364 3,529
Other Current Assets | Level 1    
Summary of Investment Holdings [Line Items]    
Money market funds $ 2,695 $ 2,787