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Funds Receivable and Customer Accounts and Investments - Strategic Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Carrying value of marketable equity securities recorded in long-term investments $ 2,100 $ 2,400
Carrying value of non-marketable equity 28 10
Carrying value of non-marketable equity securities which do not have readily determinable fair value $ 829 $ 789