Fair Value Measurement of Assets and Liabilities - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Assets:
Funds receivable and customer accounts	$ 22,527	$ 20,062
Liabilities:
Cash	4,500	3,900
Short-term restricted cash	64	77
Time deposits	614	774
Carrying value of non-marketable equity securities which do not have readily determinable fair value	524	293
Fair value, measurements, recurring basis
Assets:
Cash and cash equivalents	2,835	3,678
Funds receivable and customer accounts	10,873	11,545
Derivatives	135	320
Total financial assets	18,916	16,904
Liabilities:
Derivatives	122	67
Fair value, measurements, recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	0
Funds receivable and customer accounts	0
Derivatives	0
Total financial assets	1,314
Liabilities:
Derivatives	0
Fair value, measurements, recurring basis \| Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	2,835	3,678
Funds receivable and customer accounts	10,873	11,545
Derivatives	135	320
Total financial assets	17,602	16,904
Liabilities:
Derivatives	122	67
Cash and cash equivalents
Assets:
Funds receivable and customer accounts	8,387	5,642
Cash and cash equivalents \| Fair value, measurements, recurring basis
Assets:
Funds receivable and customer accounts	683	605
Cash and cash equivalents \| Fair value, measurements, recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Funds receivable and customer accounts	0
Cash and cash equivalents \| Fair value, measurements, recurring basis \| Significant Other Observable Inputs (Level 2)
Assets:
Funds receivable and customer accounts	683	605
U.S. government and agency securities \| Fair value, measurements, recurring basis
Assets:
Funds receivable and customer accounts	4,996	6,946
U.S. government and agency securities \| Fair value, measurements, recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Funds receivable and customer accounts	0
U.S. government and agency securities \| Fair value, measurements, recurring basis \| Significant Other Observable Inputs (Level 2)
Assets:
Funds receivable and customer accounts	4,996	6,946
Foreign government and agency securities \| Fair value, measurements, recurring basis
Assets:
Funds receivable and customer accounts	2,653	2,434
Foreign government and agency securities \| Fair value, measurements, recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Funds receivable and customer accounts	0
Foreign government and agency securities \| Fair value, measurements, recurring basis \| Significant Other Observable Inputs (Level 2)
Assets:
Funds receivable and customer accounts	2,653	2,434
Corporate debt securities \| Fair value, measurements, recurring basis
Assets:
Funds receivable and customer accounts	2,541	1,560
Corporate debt securities \| Fair value, measurements, recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Funds receivable and customer accounts	0
Corporate debt securities \| Fair value, measurements, recurring basis \| Significant Other Observable Inputs (Level 2)
Assets:
Funds receivable and customer accounts	2,541	1,560
Cash, time deposits and funds receivable
Assets:
Funds receivable and customer accounts	11,700	8,500
Short-term investments \| Fair value, measurements, recurring basis
Assets:
Investments	2,734	685
Short-term investments \| Fair value, measurements, recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments	0
Short-term investments \| Fair value, measurements, recurring basis \| Significant Other Observable Inputs (Level 2)
Assets:
Investments	2,734	685
Short-term investments \| Foreign government and agency securities \| Fair value, measurements, recurring basis
Assets:
Investments	757	235
Short-term investments \| Foreign government and agency securities \| Fair value, measurements, recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments	0
Short-term investments \| Foreign government and agency securities \| Fair value, measurements, recurring basis \| Significant Other Observable Inputs (Level 2)
Assets:
Investments	757	235
Short-term investments \| Corporate debt securities \| Fair value, measurements, recurring basis
Assets:
Investments	1,977	450
Short-term investments \| Corporate debt securities \| Fair value, measurements, recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments	0
Short-term investments \| Corporate debt securities \| Fair value, measurements, recurring basis \| Significant Other Observable Inputs (Level 2)
Assets:
Investments	1,977	450
Long-term investments \| Fair value, measurements, recurring basis
Assets:
Investments	2,339	676
Long-term investments \| Fair value, measurements, recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments	1,314
Long-term investments \| Fair value, measurements, recurring basis \| Significant Other Observable Inputs (Level 2)
Assets:
Investments	1,025	676
Long-term investments \| U.S. government and agency securities \| Fair value, measurements, recurring basis
Assets:
Investments	140
Long-term investments \| U.S. government and agency securities \| Fair value, measurements, recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments	0
Long-term investments \| U.S. government and agency securities \| Fair value, measurements, recurring basis \| Significant Other Observable Inputs (Level 2)
Assets:
Investments	140
Long-term investments \| Foreign government and agency securities \| Fair value, measurements, recurring basis
Assets:
Investments	207	48
Long-term investments \| Foreign government and agency securities \| Fair value, measurements, recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments	0
Long-term investments \| Foreign government and agency securities \| Fair value, measurements, recurring basis \| Significant Other Observable Inputs (Level 2)
Assets:
Investments	207	48
Long-term investments \| Corporate debt securities \| Fair value, measurements, recurring basis
Assets:
Investments	678	628
Long-term investments \| Corporate debt securities \| Fair value, measurements, recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments	0
Long-term investments \| Corporate debt securities \| Fair value, measurements, recurring basis \| Significant Other Observable Inputs (Level 2)
Assets:
Investments	678	$ 628
Long-term investments \| Marketable equity securities \| Fair value, measurements, recurring basis
Assets:
Investments	1,314
Long-term investments \| Marketable equity securities \| Fair value, measurements, recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments	1,314
Long-term investments \| Marketable equity securities \| Fair value, measurements, recurring basis \| Significant Other Observable Inputs (Level 2)
Assets:
Investments	$ 0

Equity Securities Without Readily Determinable Fair Value And Equity Method Investments

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Funds Receivable And Customer Accounts

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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