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Marketable and Other Securities - Fair Value of Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities $ 8,976  
Total cash and cash equivalents 19,872 $ 18,853
Cash and cash equivalents 294 277
Total restricted cash 3,092 3,064
Due in one year or less 3,590  
Due between one and five years 5,386  
Total available-for-sale debt securities with contractual maturities 8,976  
Cash and cash equivalents    
Summary of Investment Holdings [Line Items]    
Cash and time deposits 12,471 8,977
Total available-for-sale debt securities with contractual maturities 2,351 2,384
Total available-for-sale debt securities with contractual maturities 2,351 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 26 211
Total available-for-sale debt securities with contractual maturities 26 211
Cash and cash equivalents | Level 2 | Corporate debt    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 1,541 1,439
Total available-for-sale debt securities with contractual maturities 1,541 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 785 734
Total available-for-sale debt securities with contractual maturities 785 734
Cash and cash equivalents | Level 1    
Summary of Investment Holdings [Line Items]    
Money market funds 5,050 7,491
Marketable debt securities    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 7,265 7,613
Total available-for-sale debt securities with contractual maturities 7,265 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 3,082 3,495
Total available-for-sale debt securities with contractual maturities 3,082 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 591 589
Total available-for-sale debt securities with contractual maturities 591 589
Marketable debt securities | Level 2 | Corporate Debt And Other Securities    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 3,592 3,529
Total available-for-sale debt securities with contractual maturities 3,592 3,529
Restricted cash - cash equivalents | Level 1    
Summary of Investment Holdings [Line Items]    
Money market funds $ 2,798 $ 2,787