Organization and Business Activities (Details) item in Thousands, $ in Millions	3 Months Ended	84 Months Ended	135 Months Ended
	Mar. 31, 2019 USD ($) segment item	Dec. 31, 2014 USD ($)	Mar. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)
Spectrum Investments
Number of primary operating business units | segment	2
Number of Pay-TV subscribers | item	12,063		12,063
Payment to acquire certain wireless licenses and related assets		$ 11,000.0	$ 21,000.0
Total debt and equity investments in subsidiaries	$ 10,000.0		$ 10,000.0
Sling TV Holding L.L.C.
Spectrum Investments
Number of Pay-TV subscribers | item	2,424		2,424
Dish TV
Spectrum Investments
Number of Pay-TV subscribers | item	9,639		9,639
Wireless
Spectrum Investments
Payment to acquire certain wireless licenses and related assets			$ 11,000.0
Northstar Spectrum And SNR Holdco
Spectrum Investments
Total debt and equity investments in subsidiaries	$ 10.0		$ 10.0	$ 10,000.0