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Organization and Business Activities (Details)
item in Thousands, $ in Millions
12 Months Ended 84 Months Ended 120 Months Ended
May 11, 2017
USD ($)
Jul. 01, 2016
USD ($)
Dec. 31, 2017
USD ($)
segment
item
Dec. 31, 2014
USD ($)
Dec. 31, 2017
USD ($)
item
Spectrum Investments          
Number of primary operating business units | segment     2    
Number of Pay-TV subscribers | item     13,242   13,242
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     2,212   2,212
Dish TV          
Spectrum Investments          
Number of Pay-TV subscribers | item     11,030   11,030
Wireless          
Spectrum Investments          
Payment to acquire certain wireless licenses and related assets       $ 11,000.0 $ 11,000.0
Auction 1000 [Member] | FCC Wireless Bureau [Member]          
Spectrum Investments          
Payment to acquire certain wireless licenses and related assets   $ 1,500.0      
Payment Of Winning Bid Remaining Balance $ 4,711.0        
Northstar Spectrum And SNR Holdco          
Spectrum Investments          
Total debt and equity investments in subsidiaries     $ 10,000.0   10,000.0
Northstar Spectrum And SNR Holdco | Wireless          
Spectrum Investments          
Total debt and equity investments in subsidiaries     10,000.0   10,000.0
Northstar Wireless or Northstar Spectrum          
Spectrum Investments          
Total debt and equity investments in subsidiaries     $ 10,000.0   $ 10,000.0