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Information About Liberty's Operating Segments - Revenue and Long-Lived Assets by Geographic Area (Details)

v3.10.0.1

Information About Liberty's Operating Segments - Revenue and Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý
Total revenue	$ 2,009	$ 2,315	$ 2,199	$ 1,517	$ 1,994	$ 2,065	$ 2,140	$ 1,395	$ 8,040	$ 7,594	$ 5,276
Long-Lived Assets	2,469	Ìý	Ìý	Ìý	2,541	Ìý	Ìý	Ìý	2,469	2,541	Ìý
UNITED STATES	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý
Revenues from External Customers and Long-Lived Assets [Line Items]	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý
Total revenue	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	6,209	5,724	5,230
Long-Lived Assets	2,457	Ìý	Ìý	Ìý	2,529	Ìý	Ìý	Ìý	2,457	2,529	Ìý
UNITED KINGDOM	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý
Revenues from External Customers and Long-Lived Assets [Line Items]	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý
Total revenue	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	1,831	1,783	Ìý
Long-Lived Assets	$ 12	Ìý	Ìý