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Long-Term Debt and Capital Lease Obligations - Debt Table (Details) € in Millions, $ in Millions	Mar. 31, 2019 EUR (€)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Outstanding Principal		$ 4,129
Total obligations		4,223	$ 4,243
Less portion classified as current			(5)
Total long-term debt		4,223	4,238
1.0% Exchangeable Senior Debentures
Debt Instrument [Line Items]
Outstanding Principal		400
total debt		392	382
Expedia \| Expedia 5.95% Notes
Debt Instrument [Line Items]
Outstanding Principal		750
total debt		784	790
Expedia \| Expedia 2.5% Notes
Debt Instrument [Line Items]
Outstanding Principal	€ 650	729
total debt		760	777
Expedia \| Expedia 4.5% Notes
Debt Instrument [Line Items]
Outstanding Principal		500
total debt		517	518
Expedia \| Expedia 5.0% Notes
Debt Instrument [Line Items]
Outstanding Principal		750
total debt		779	780
Expedia \| Expedia 3.8% Notes
Debt Instrument [Line Items]
Outstanding Principal		1,000
total debt		$ 991	991
Bodybuilding \| Bodybuilding Revolving line of credit due 2020
Debt Instrument [Line Items]
total debt			$ 5