Investments In Affiliates Accounted For Using The Equity Method (Liberty Broadband's Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Investments in affiliates, accounted for using the equity method	$ 646	$ 581
Liberty Broadband
Current assets	253	258
Investments in affiliates, accounted for using the equity method	9,336	9,315
Other assets	14	18
Total assets	9,603	9,591
Long-term debt, including current portion	599	599
Deferred income taxes	505	505
Other liabilities	21	14
Equity	8,478	8,473
Total liabilities and equity	$ 9,603	$ 9,591