Acquisitions, Other Investments and Divestitures - Additional Information (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) Business	Jul. 27, 2017 USD ($)
Business Acquisition [Line Items]
Number of business combinations | Business				2
Weighted average life of acquired intangible assets				2 years 10 months 24 days
Business acquisition, cash acquired				$ 1
Investments without readily determinable fair values	$ 330	$ 330	$ 467
Loss on sale of businesses, net		(13)	0	0
Accounts payable, merchant	602	602	$ 1,921
Disposal Group, Held-for-sale, Not Discontinued Operations
Business Acquisition [Line Items]
Loss on sale of businesses, net	(13)
Disposal group, including discontinued operation, assets	21	21
Cash and cash equivalents	5	5
Held-for-sale assets, accounts receivable	2	2
Held-for-sale assets, prepaid expenses and other current assets	12	12
Held-for-sale liabilities	53	53
Accounts payable, merchant	8	8
Held-for-sale liabilities, accrued expenses and other current liabilities	5	5
Deferred merchant bookings liability, current	$ 38	$ 38
Traveloka Holding Limited
Business Acquisition [Line Items]
Investments without readily determinable fair values				$ 70	$ 350