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Fair Value Measurement of Assets and Liabilities - Financial Assets and Liabilities Measured at Fair Value, Recurring (Details) - Recurring - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets:    
Cash and cash equivalents $ 3,513 $ 3,286
Derivatives 49 97
Total financial assets 6,462 8,149
Liabilities:    
Derivatives 14 18
Cash and cash equivalents    
Assets:    
Cash and cash equivalents 2,423 2,433
Customer accounts    
Assets:    
Cash and cash equivalents 947 763
Restricted cash included in other current assets    
Assets:    
Cash and cash equivalents 142 88
Restricted cash included in other assets    
Assets:    
Cash and cash equivalents 1 2
Short-term investments:    
Assets:    
Investments 955 3,457
Long-term investments:    
Assets:    
Investments 1,945 1,309
Corporate debt securities | Short-term investments:    
Assets:    
Investments 926 3,094
Corporate debt securities | Long-term investments:    
Assets:    
Investments 1,811 1,119
Government and agency securities | Short-term investments:    
Assets:    
Investments 29 363
Government and agency securities | Long-term investments:    
Assets:    
Investments 134 190
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Cash and cash equivalents 3,513 3,286
Derivatives 0 0
Total financial assets 3,513 3,286
Liabilities:    
Derivatives 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents    
Assets:    
Cash and cash equivalents 2,423 2,433
Quoted Prices in Active Markets for Identical Assets (Level 1) | Customer accounts    
Assets:    
Cash and cash equivalents 947 763
Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted cash included in other current assets    
Assets:    
Cash and cash equivalents 142 88
Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted cash included in other assets    
Assets:    
Cash and cash equivalents 1 2
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments:    
Assets:    
Investments 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term investments:    
Assets:    
Investments 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities | Short-term investments:    
Assets:    
Investments 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities | Long-term investments:    
Assets:    
Investments 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Government and agency securities | Short-term investments:    
Assets:    
Investments 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Government and agency securities | Long-term investments:    
Assets:    
Investments 0 0
Significant Other Observable Inputs (Level 2)    
Assets:    
Cash and cash equivalents 0 0
Derivatives 32 82
Total financial assets 2,932 4,848
Liabilities:    
Derivatives 14 18
Significant Other Observable Inputs (Level 2) | Cash and cash equivalents    
Assets:    
Cash and cash equivalents 0 0
Significant Other Observable Inputs (Level 2) | Customer accounts    
Assets:    
Cash and cash equivalents 0 0
Significant Other Observable Inputs (Level 2) | Restricted cash included in other current assets    
Assets:    
Cash and cash equivalents 0 0
Significant Other Observable Inputs (Level 2) | Restricted cash included in other assets    
Assets:    
Cash and cash equivalents 0 0
Significant Other Observable Inputs (Level 2) | Short-term investments:    
Assets:    
Investments 955 3,457
Significant Other Observable Inputs (Level 2) | Long-term investments:    
Assets:    
Investments 1,945 1,309
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Short-term investments:    
Assets:    
Investments 926 3,094
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Long-term investments:    
Assets:    
Investments 1,811 1,119
Significant Other Observable Inputs (Level 2) | Government and agency securities | Short-term investments:    
Assets:    
Investments 29 363
Significant Other Observable Inputs (Level 2) | Government and agency securities | Long-term investments:    
Assets:    
Investments 134 190
Significant Unobservable Inputs (Level 3)    
Assets:    
Cash and cash equivalents 0 0
Derivatives 17 15
Total financial assets 17 15
Liabilities:    
Derivatives 0 0
Significant Unobservable Inputs (Level 3) | Cash and cash equivalents    
Assets:    
Cash and cash equivalents 0 0
Significant Unobservable Inputs (Level 3) | Customer accounts    
Assets:    
Cash and cash equivalents 0 0
Significant Unobservable Inputs (Level 3) | Restricted cash included in other current assets    
Assets:    
Cash and cash equivalents 0 0
Significant Unobservable Inputs (Level 3) | Restricted cash included in other assets    
Assets:    
Cash and cash equivalents 0 0
Significant Unobservable Inputs (Level 3) | Short-term investments:    
Assets:    
Investments 0 0
Significant Unobservable Inputs (Level 3) | Long-term investments:    
Assets:    
Investments 0 0
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Short-term investments:    
Assets:    
Investments 0 0
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Long-term investments:    
Assets:    
Investments 0 0
Significant Unobservable Inputs (Level 3) | Government and agency securities | Short-term investments:    
Assets:    
Investments 0 0
Significant Unobservable Inputs (Level 3) | Government and agency securities | Long-term investments:    
Assets:    
Investments $ 0 $ 0