Fair Value Measurement of Assets and Liabilities - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value	$ 12,013	$ 9,657
Notes payable, fair value	$ 5,000
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments, duration	1 month
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments, duration	1 year
Maximum \| Cash Flow Hedging \| Foreign Exchange Contract \| Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments, duration	18 months
Funds receivable and customer accounts \| Fair Value Option, Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value	$ 1,690	2,339
Net gains (losses) from fair value changes	(43)	(117)
Short-term investments \| Fair Value Option, Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value	246	295
Net gains (losses) from fair value changes	(8)	(15)
Long-term investments \| Fair Value Option, Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value	$ 0	$ 10

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of notes payable.

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