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Fair Value Measurement of Assets and Liabilities - Summary of Investments Under the Fair Value Option (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt securities, available-for-sale $ 22,949   $ 21,595
Fair Value Option, Investments | Funds receivable and customer accounts      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt securities, available-for-sale 2,475   2,914
Net gains (losses) from fair value changes (67) $ (20)  
Fair Value Option, Investments | Short term investments      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt securities, available-for-sale 508   $ 0
Net gains (losses) from fair value changes $ (11) $ (18)