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Marketable and Other Securities - Fair Value of Cash Equivalents and Marketable Debt Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities $ 8,574  
Total cash and cash equivalents 20,570 $ 19,872
Cash and cash equivalents 408 294
Total restricted cash 3,472 3,092
Due in one year or less 3,352  
Due between one and five years 5,222  
Total available-for-sale debt securities with contractual maturities 8,574  
Cash and cash equivalents    
Summary of Investment Holdings [Line Items]    
Cash and time deposits 11,712 12,471
Total available-for-sale debt securities with contractual maturities 2,289 2,351
Total available-for-sale debt securities with contractual maturities 2,289 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 117 26
Total available-for-sale debt securities with contractual maturities 117 26
Cash and cash equivalents | Level 2 | Corporate debt    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 2,039 1,541
Total available-for-sale debt securities with contractual maturities 2,039 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 133 785
Total available-for-sale debt securities with contractual maturities 133 785
Cash and cash equivalents | Level 1    
Summary of Investment Holdings [Line Items]    
Money market funds 6,570 5,050
Marketable debt securities    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 6,919 7,265
Total available-for-sale debt securities with contractual maturities 6,919 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 2,624 3,082
Total available-for-sale debt securities with contractual maturities 2,624 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 571 591
Total available-for-sale debt securities with contractual maturities 571 591
Marketable debt securities | Level 2 | Corporate debt and other    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 3,724 3,592
Total available-for-sale debt securities with contractual maturities 3,724 3,592
Other Current Assets | Level 1    
Summary of Investment Holdings [Line Items]    
Money market funds $ 3,064 $ 2,798