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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) |

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