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Funds Receivable and Customer Accounts and Investments - Summary of Cumulative Gross Unrealized Gains and Cumulative Gross Unrealized Losses and Impairment Related to Non-marketable Equity Securities Accounted for Under the Measurement Alternative (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Investments, Debt and Equity Securities [Abstract] |  |
Cumulative gross unrealized gains | $ 389 | $ 378
Cumulative gross unrealized losses and impairment | $ (27) | $ (27)

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- Definition Amount of cumulative impairment loss on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117539-209714 + Details
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- Definition Amount of cumulative gain from upward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117539-209714 + Details
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