Annual report pursuant to Section 13 and 15(d)

Assets and Liabilities Measured at Fair Value (Details)

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Assets and Liabilities Measured at Fair Value (Details)
shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 23, 2016
USD ($)
Jun. 06, 2016
$ / item
shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Repayments of Long-term Debt   $ 359 $ 245 $ 369    
Forward Contracts            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Forward floor price | $ / item           38.90
Forward cap price | $ / item           98.96
Forward Contracts | Variable postpaid forward            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total borrowings         $ 259  
Repayments of Long-term Debt $ 270          
Tripadvisor | Forward Contracts            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Forward Contract Shares indexed | shares           7
Recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Cash equivalents 22 22 145      
Marketable securities     15      
Recurring | Variable postpaid forward            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset     20      
Recurring | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Cash equivalents $ 22 $ 22 140      
Recurring | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Cash equivalents     5      
Marketable securities     15      
Recurring | Level 2 | Variable postpaid forward            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset     $ 20