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Marketable and Other Securities - Fair Value of Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities $ 9,225  
Total cash and cash equivalents 18,853 $ 19,153
Cash and cash equivalents 277 341
Total restricted cash 3,064 2,796
Due in one year or less 3,725  
Due between one and five years 5,500  
Total available-for-sale debt securities with contractual maturities 9,225  
Cash and cash equivalents    
Summary of Investment Holdings [Line Items]    
Cash and time deposits 8,977 8,921
Total available-for-sale debt securities with contractual maturities 2,384 5,618
Total available-for-sale debt securities with contractual maturities 2,384 5,618
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 211 1,012
Total available-for-sale debt securities with contractual maturities 211 1,012
Cash and cash equivalents | Level 2 | Corporate debt    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 1,439 2,778
Total available-for-sale debt securities with contractual maturities 1,439 2,778
Cash and cash equivalents | Level 2 | Sovereign debt    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 734 1,828
Total available-for-sale debt securities with contractual maturities 734 1,828
Cash and cash equivalents | Level 1    
Summary of Investment Holdings [Line Items]    
Money market funds 7,491 4,613
Marketable debt securities    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 7,613 12,150
Total available-for-sale debt securities with contractual maturities 7,613 12,150
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 3,495 4,357
Total available-for-sale debt securities with contractual maturities 3,495 4,357
Marketable debt securities | Level 2 | Corporate debt    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 3,274 5,147
Total available-for-sale debt securities with contractual maturities 3,274 5,147
Marketable debt securities | Level 2 | Sovereign debt    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 255 2,108
Total available-for-sale debt securities with contractual maturities 255 2,108
Marketable debt securities | Level 2 | Mortgage and asset-backed    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 589 538
Total available-for-sale debt securities with contractual maturities 589 538
Restricted cash - cash equivalents | Level 1    
Summary of Investment Holdings [Line Items]    
Money market funds $ 2,787 $ 2,455