Commitments and Contingencies - Part 2 (Details)								3 Months Ended			24 Months Ended
	Apr. 05, 2018 USD ($)	May 22, 2017 $ / item	Jan. 19, 2017 USD ($) item	Sep. 23, 2016 USD ($)	Aug. 18, 2015 USD ($)	Dec. 23, 2013 USD ($)	Apr. 29, 2011 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jun. 05, 2017 USD ($)
Vermont National Telephone Company [Member]
Loss contingency terms
Recovery amount				$ 10,000,000,000
Satellite transponder guarantees
Loss contingencies
Guarantees for payments								$ 111,000,000
Litigation accrual								$ 0
Northstar Spectrum And SNR Holdco
Loss contingency terms
Percentage Of Bidding Credit					25.00%
Northstar Spectrum And SNR Holdco | AWS-3 Licenses
Loss contingencies
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 Wireless or Northstar Spectrum
Loss contingency terms
Percentage Of Bidding Credit								15.00%
Bidding Credit					$ 1,961,000,000
Northstar Wireless or Northstar Spectrum | AWS-3 Licenses
Loss contingency terms
Percentage Of Bidding Credit				25.00%				25.00%
Northstar Wireless or Northstar Spectrum | AWS-3 Licenses | Vermont National Telephone Company [Member]
Loss contingency terms
Bidding Credit				$ 3,300,000,000
Northstar Wireless or Northstar Spectrum | AWS-3 Licenses | Minimum | Vermont National Telephone Company [Member]
Loss contingency terms
Claim amount				5,500
Northstar Wireless or Northstar Spectrum | AWS-3 Licenses | Maximum | Vermont National Telephone Company [Member]
Loss contingency terms
Claim amount				$ 11,000
SNR Wireless or SNR Wireless Holdco
Loss contingency terms
Bidding Credit					$ 1,370,000,000
Lightsquared Harbinger Capital Partners LLC
Loss contingencies
Business days allowed to terminate existing agreements								3 days
Telemarketing Litigation
Loss contingencies
Period of injunctive relief sought from placing any outbound telemarketing calls to market or promote its goods or services								5 years
Telemarketing Litigation | OHIO
Loss contingency terms
Claim amount								$ 10,000,000
Telemarketing Litigation | CALIFORNIA
Loss contingencies
Claim amount from state plaintiff								$ 100,000,000
Do Not Call Litigation
Loss contingencies
Period of injunctive relief sought from placing any outbound telemarketing calls to market or promote its goods or services								5 years
Number Of Telemarketing Calls | item			51,119
Litigation Per Call Damages			$ 400
Do Not Call Litigation | Maximum | Illinois And North Carolina [Member]
Loss contingencies
Claim amount from state plaintiff								$ 1,000,000,000
Krakauer Action
Loss contingencies
Litigation Expense									$ 41,000,000	$ 20,000,000
Third party Number Of Calls Made In Case Trebled Damages Per Call | $ / item		1,200
Settlement amount awarded to other party	$ 61,000,000
Krakauer Action | Other Accrued Expense
Loss contingencies
Litigation accrual								61,000,000
TiVo vs Dish Network and EchoStar Corporation | DISH Network
Loss contingencies
Litigation accrual							$ 200,000,000
Settlement amount awarded to other party							$ 500,000,000
DISH Network L.L.C. | Telemarketing Litigation
Loss contingencies
Claim amount from state plaintiff								23,500,000,000
Damages awarded to state and federal plaintiff												$ 280,000,000
Litigation Expense									$ 255,000,000		$ 25,000,000
Loss contingency terms
Claim amount						$ 270,000,000
DISH Network L.L.C. | Telemarketing Litigation | Other Accrued Expense
Loss contingencies
Litigation accrual								280,000,000
DISH Network L.L.C. | Telemarketing Litigation | Maximum
Loss contingencies
Claim amount from federal plaintiff								$ 900,000,000