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Commitments and Contingencies (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended 84 Months Ended 114 Months Ended 123 Months Ended
May 11, 2017
USD ($)
Sep. 23, 2016
Jul. 01, 2016
USD ($)
Aug. 18, 2015
USD ($)
Apr. 29, 2014
USD ($)
segment
Oct. 29, 2013
Mar. 09, 2012
Mar. 09, 2012
USD ($)
Jan. 31, 2017
Mar. 31, 2018
USD ($)
item
Dec. 31, 2008
USD ($)
Dec. 31, 2014
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Apr. 13, 2017
USD ($)
item
Spectrum Investments                                
Payment to acquire certain wireless licenses and related assets                       $ 11,000.0   $ 21,000.0    
Number of geographical license areas | item                   214            
Commitments relating to AWS-3 Auction                                
Noncontrolling Interest in Variable Interest Entity                   $ 10,000.0       10,000.0    
MVDDS Licenses                                
Spectrum Investments                                
Number of geographical license areas | item                   82            
LMDS Licenses                                
Spectrum Investments                                
Number Of Markets | item                   4            
Wireless                                
Spectrum Investments                                
Payment to acquire certain wireless licenses and related assets                         $ 11,000.0 11.0    
Commitments relating to AWS-3 Auction                                
Noncontrolling Interest in Variable Interest Entity                   $ 11,000.0       11,000.0    
H Block Licenses                                
Spectrum Investments                                
Payment to acquire certain wireless licenses and related assets         $ 1,672.0                      
Number of wireless spectrum licenses | segment         176                      
Accelerated period to meet Final Build-Out Requirement on failure to meet Interim Build-Out Requirement                   2 years            
H Block Licenses | Minimum                                
Spectrum Investments                                
Interim Build-out Requirement (as a percent)                   40.00%            
Final Build-out Requirement (as a percent)                   75.00%            
700 MHz Licenses                                
Spectrum Investments                                
Payment to acquire certain wireless licenses and related assets                     $ 712.0          
Modified 700 MHz Final Build-out Requirement (as a percent)           70.00%                    
600 MHz Licenses                                
Spectrum Investments                                
Number of wireless spectrum licenses | item                               486
Build-out requirement accelerated period                 2 years              
Aggregate Bid Price                               $ 6,211.0
Licenses Renewal Period                   39 months            
600 MHz Licenses | Maximum                                
Spectrum Investments                                
Percent of coverage on available licensed geographic areas                   75.00%            
600 MHz Licenses | Minimum                                
Spectrum Investments                                
Percent of coverage on available licensed geographic areas                   40.00%            
DBSD North America and TerreStar Transactions | Wireless                                
Spectrum Investments                                
Purchase price               $ 2,860.0                
AWS-4 Final Build-out Requirement (as a percent)                   70.00%            
DBSD North America and TerreStar Transactions | AWS-4 Satellites                                
Spectrum Investments                                
Ownership percentage             100.00%                  
Northstar Spectrum And SNR Holdco                                
Commitments relating to AWS-3 Auction                                
Noncontrolling Interest in Variable Interest Entity                   $ 10.0       $ 10.0 $ 10,000.0  
Percentage of bidding credit       25.00%                        
Northstar Spectrum And SNR Holdco | American III                                
Spectrum Investments                                
Number of wireless spectrum licenses | item                   244       244    
Northstar Spectrum And SNR Holdco | AWS-3 Licenses                                
Spectrum Investments                                
Interim Build-out Requirement (as a percent)                   40.00%            
Final Build-out Requirement (as a percent)                   75.00%            
Accelerated period to meet Final Build-Out Requirement on failure to meet Interim Build-Out Requirement                   2 years            
Northstar Spectrum And SNR Holdco | Prior Arrangement [Member] | SNR Licenses                                
Commitments relating to AWS-3 Auction                                
Number of licenses returned | item                   113            
Northstar Spectrum And SNR Holdco | Northstar Operative Agreement [Member]                                
Spectrum Investments                                
Debt outstanding amount                   $ 6,870.0       $ 6,870.0    
Northstar Wireless or Northstar Spectrum                                
Spectrum Investments                                
Interim Payment                   $ 334.0            
Interim payment percentage                   15.00%            
Re-Auction payment                   $ 1,892.0            
Commitments relating to AWS-3 Auction                                
Percentage of bidding credit                   15.00%            
Bidding credit value       $ 1,961.0                        
Northstar Wireless or Northstar Spectrum | Northstar Manager LLC                                
Commitments relating to AWS-3 Auction                                
Controlling interest owned by other companies                   15.00%            
Equity contribution                   $ 133.0            
Northstar Wireless or Northstar Spectrum | American II                                
Spectrum Investments                                
Ownership percentage                   85.00%            
Loan made                   $ 69.0            
Commitments relating to AWS-3 Auction                                
Equity contribution                   $ 7,621.0            
Northstar Wireless or Northstar Spectrum | Northstar Licenses                                
Spectrum Investments                                
Number of wireless spectrum licenses | item                   261       261    
Commitments relating to AWS-3 Auction                                
Gross winning bids                   $ 5,619.0            
Northstar Wireless or Northstar Spectrum | AWS-3 Licenses                                
Spectrum Investments                                
Non-payment gross winning bids                   2,226.0       $ 2,226.0    
Commitments relating to AWS-3 Auction                                
Gross winning bids                   $ 7,845.0            
Percentage of bidding credit   25.00%               25.00%            
Net winning bid                   $ 5,884.0            
Number of licenses returned | item                   84            
Northstar Wireless or Northstar Spectrum | Northstar Operative Agreement [Member] | Preferred Class A [Member]                                
Spectrum Investments                                
Number shares issued in conversion | item                   6,870,493            
Preferred stock quarterly distribution (as a percent)                   12.00%            
Northstar Wireless or Northstar Spectrum | Northstar Operative Agreement [Member] | Maximum                                
Spectrum Investments                                
Interest rate (as a percent)                   12.00%       12.00%    
Northstar Wireless or Northstar Spectrum | Northstar Operative Agreement [Member] | Minimum                                
Spectrum Investments                                
Interest rate (as a percent)                   6.00%       6.00%    
Northstar Wireless or Northstar Spectrum | Northstar Operative Agreement [Member] | Northstar Manager LLC                                
Spectrum Investments                                
Principal amount of debt                   $ 500.0       $ 500.0    
SNR Wireless or SNR Wireless Holdco                                
Spectrum Investments                                
Interim Payment                   182.0            
Re-Auction payment                   1,029.0            
Debt outstanding amount                   5,065.0       5,065.0    
Principal amount of debt                   $ 500.0       500.0    
Commitments relating to AWS-3 Auction                                
Bidding credit value       $ 1,370.0                        
SNR Wireless or SNR Wireless Holdco | Preferred Class A [Member]                                
Spectrum Investments                                
Number shares issued in conversion | item                   5,065,415            
Preferred stock quarterly distribution (as a percent)                   12.00%            
SNR Wireless or SNR Wireless Holdco | SNR Wireless Management LLC                                
Commitments relating to AWS-3 Auction                                
Controlling interest owned by other companies                   15.00%            
Equity contribution                   $ 93.0            
SNR Wireless or SNR Wireless Holdco | American III                                
Spectrum Investments                                
Ownership percentage                   85.00%            
Loan made                   $ 344.0            
Commitments relating to AWS-3 Auction                                
Equity contribution                   5,590.0            
Gross winning bids                   4,271.0            
SNR Wireless or SNR Wireless Holdco | AWS 3 Auction                                
Commitments relating to AWS-3 Auction                                
Gross winning bids                   5,482.0            
Net winning bid                   4,112.0            
Bid withdrawal payment                   $ 8.0            
SNR Wireless or SNR Wireless Holdco | AWS-3 Licenses | SNR Wireless Management LLC                                
Commitments relating to AWS-3 Auction                                
Percentage of bidding credit                   15.00%            
SNR Wireless or SNR Wireless Holdco | SNR Licenses                                
Spectrum Investments                                
Non-payment gross winning bids                   $ 1,211.0       $ 1,211.0    
Additional Bid Withdrawal Payment                   $ 3.0            
SNR Wireless or SNR Wireless Holdco | SNR Operative Agreement [Member] | Preferred Class A [Member]                                
Spectrum Investments                                
Preferred stock quarterly distribution (as a percent)                   6.00%            
FCC Wireless Bureau | Auction 1000                                
Spectrum Investments                                
Payment to acquire certain wireless licenses and related assets     $ 1,500.0                          
Payment of remaining balance of winning bid $ 4,711.0                              
SNR Credit Agreement [Member] | SNR Wireless or SNR Wireless Holdco                                
Spectrum Investments                                
Loan made                   $ 500.0            
Northstar Credit Agreement | Northstar Wireless or Northstar Spectrum | American II                                
Spectrum Investments                                
Loan made                   $ 500.0