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Fair Value Measurement of Assets and Liabilities - Financial Assets and Liabilities Measured at Fair Value, Recurring (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Liabilities:    
Short-term investments $ 30  
Recurring    
Assets:    
Cash and cash equivalents 4,156 $ 3,286
Derivatives 66 97
Total financial assets 7,470 8,149
Liabilities:    
Derivatives 16 18
Recurring | Cash and cash equivalents    
Assets:    
Cash and cash equivalents 3,031 2,433
Recurring | Customer accounts    
Assets:    
Cash and cash equivalents 967 763
Recurring | Restricted cash included in other current assets    
Assets:    
Cash and cash equivalents 156 88
Recurring | Restricted cash included in other assets    
Assets:    
Cash and cash equivalents 2 2
Recurring | Short-term investments:    
Assets:    
Investments 1,790 3,457
Recurring | Long-term investments:    
Assets:    
Investments 1,458 1,309
Recurring | Corporate debt securities | Short-term investments:    
Assets:    
Investments 1,539 3,094
Recurring | Corporate debt securities | Long-term investments:    
Assets:    
Investments 1,317 1,119
Recurring | Government and agency securities | Short-term investments:    
Assets:    
Investments 251 363
Recurring | Government and agency securities | Long-term investments:    
Assets:    
Investments 141 190
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Cash and cash equivalents 4,156 3,286
Derivatives 0 0
Total financial assets 4,156 3,286
Liabilities:    
Derivatives 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents    
Assets:    
Cash and cash equivalents 3,031 2,433
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Customer accounts    
Assets:    
Cash and cash equivalents 967 763
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted cash included in other current assets    
Assets:    
Cash and cash equivalents 156 88
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted cash included in other assets    
Assets:    
Cash and cash equivalents 2 2
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments:    
Assets:    
Investments 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term investments:    
Assets:    
Investments 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities | Short-term investments:    
Assets:    
Investments 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities | Long-term investments:    
Assets:    
Investments 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Government and agency securities | Short-term investments:    
Assets:    
Investments 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Government and agency securities | Long-term investments:    
Assets:    
Investments 0 0
Recurring | Significant Other Observable Inputs (Level 2)    
Assets:    
Cash and cash equivalents 0 0
Derivatives 51 82
Total financial assets 3,299 4,848
Liabilities:    
Derivatives 16 18
Recurring | Significant Other Observable Inputs (Level 2) | Cash and cash equivalents    
Assets:    
Cash and cash equivalents 0 0
Recurring | Significant Other Observable Inputs (Level 2) | Customer accounts    
Assets:    
Cash and cash equivalents 0 0
Recurring | Significant Other Observable Inputs (Level 2) | Restricted cash included in other current assets    
Assets:    
Cash and cash equivalents 0 0
Recurring | Significant Other Observable Inputs (Level 2) | Restricted cash included in other assets    
Assets:    
Cash and cash equivalents 0 0
Recurring | Significant Other Observable Inputs (Level 2) | Short-term investments:    
Assets:    
Investments 1,790 3,457
Recurring | Significant Other Observable Inputs (Level 2) | Long-term investments:    
Assets:    
Investments 1,458 1,309
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Short-term investments:    
Assets:    
Investments 1,539 3,094
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Long-term investments:    
Assets:    
Investments 1,317 1,119
Recurring | Significant Other Observable Inputs (Level 2) | Government and agency securities | Short-term investments:    
Assets:    
Investments 251 363
Recurring | Significant Other Observable Inputs (Level 2) | Government and agency securities | Long-term investments:    
Assets:    
Investments 141 190
Recurring | Significant Unobservable Inputs (Level 3)    
Assets:    
Cash and cash equivalents 0 0
Derivatives 15 15
Total financial assets 15 15
Liabilities:    
Derivatives 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Cash and cash equivalents    
Assets:    
Cash and cash equivalents 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Customer accounts    
Assets:    
Cash and cash equivalents 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Restricted cash included in other current assets    
Assets:    
Cash and cash equivalents 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Restricted cash included in other assets    
Assets:    
Cash and cash equivalents 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Short-term investments:    
Assets:    
Investments 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Long-term investments:    
Assets:    
Investments 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Short-term investments:    
Assets:    
Investments 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Long-term investments:    
Assets:    
Investments 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Government and agency securities | Short-term investments:    
Assets:    
Investments 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Government and agency securities | Long-term investments:    
Assets:    
Investments $ 0 $ 0