Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation - Spin Off of TripCo from Liberty (Details)

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Basis of Presentation - Spin Off of TripCo from Liberty (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Liberty Media        
Related Party Transaction, Amounts of Transaction $ 1 $ 1 $ 2 $ 2