Funds Receivable and Customer Accounts and Investments - Schedule of Estimated Fair Value of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	$ 12,011	$ 9,670
Gross Unrealized Gains	2	2
Gross Unrealized Losses	0	(15)
Estimated Fair Value	12,013	9,657
Funds receivable and customer accounts \| U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	4,996	6,945
Gross Unrealized Gains	0	2
Gross Unrealized Losses	0	0
Estimated Fair Value	4,996	6,947
Funds receivable and customer accounts \| Foreign government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	1,392	772
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(1)
Estimated Fair Value	1,392	771
Funds receivable and customer accounts \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	2,112	883
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	2,112	883
Short-term investments \| Foreign government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	533
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	533
Short-term investments \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	1,955	393
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(3)
Estimated Fair Value	1,955	390
Long-term investments \| U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	140
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	140
Long-term investments \| Foreign government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	207	38
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	207	38
Long-term investments \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	676	639
Gross Unrealized Gains	2	0
Gross Unrealized Losses	0	(11)
Estimated Fair Value	$ 678	$ 628

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 2
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-Publisher FASB
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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