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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
Investments, Debt and Equity Securities [Abstract]    
Cumulative gross unrealized gains $ 389 $ 378
Cumulative gross unrealized losses and impairment $ (27) $ (27)