v3.26.3
Marketable and Other Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities $ 587  
Total cash and cash equivalents 4,431 $ 5,826
Cash and cash equivalents 246 235
Total restricted cash 3,722 3,217
Due in one year or less 416  
Due between one and five years 172  
Total available-for-sale debt securities with contractual maturities 587  
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue    
Summary of Investment Holdings [Line Items]    
Cash and time deposits 2,669 3,025
Total available-for-sale debt securities with contractual maturities 329 530
Total available-for-sale debt securities with contractual maturities 329 530
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 2 | U.S. government and agencies    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 171 430
Total available-for-sale debt securities with contractual maturities 171 430
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 2 | Sovereign debt    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 158 99
Total available-for-sale debt securities with contractual maturities 158 99
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 1    
Summary of Investment Holdings [Line Items]    
Money market funds 1,433 2,272
Balance Sheet Location [Axis]: us-gaap:OtherAssets    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 258 39
Total available-for-sale debt securities with contractual maturities 258 39
Balance Sheet Location [Axis]: us-gaap:OtherAssets | Level 2 | U.S. government and agencies    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 52 39
Total available-for-sale debt securities with contractual maturities 52 39
Balance Sheet Location [Axis]: us-gaap:OtherAssets | Level 2 | Corporate debt and other    
Summary of Investment Holdings [Line Items]    
Total available-for-sale debt securities with contractual maturities 206 0
Total available-for-sale debt securities with contractual maturities 206 0
Balance Sheet Location [Axis]: us-gaap:OtherAssets | Level 1    
Summary of Investment Holdings [Line Items]    
Money market funds $ 3,476 $ 2,981