Derivative Instruments (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Other investment (income) expense, net	[1]	$ (91,000,000)	$ (25,000,000)	$ (57,000,000)	$ (9,000,000)
Secured Debt [Member] | Term Loan B Facility [Member]
Long-term Debt		1,926,000,000		1,926,000,000		$ 1,935,000,000
Cash Flow Hedging [Member]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months		$ 11,000,000
Cash Flow Hedging [Member] | Forward-starting interest rate swap [Member]
Derivative, Maturity Date		Mar. 29, 2025
Derivative, Notional Amount		$ 1,500,000,000		1,500,000,000		1.5
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Derivative, Maturity Date		Jul. 27, 2021
Derivative, Notional Amount		$ 1,550,000,000		1,550,000,000		1.55
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net		0
Intercompany receivables and payables [Domain] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative, Notional Amount		$ 53,000,000		$ 53,000,000		$ 20,000,000
Maximum [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative, Maturity Date		Dec. 31, 2020

[1] (b) Includes changes in the value of Grubhub, Inc. common stock and other investments (see Note 13).