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Represents the number of additional days allowed to management to put its interest.

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Aggregate bid price.

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Represents bid withdrawal payment.

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- Definition

Represents value of bidding credit.

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Build Out Accelerated Duration On Second Period

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Represents the number of days allowed to management to put its interest.

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Represents the combined net winning bids.

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Represents of equity contributions.

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Represents gross winning bids amount.

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Interim Payment

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Interim Payment Percentage

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Licenses Renewal Period

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The amount of non payment of gross winning bids.

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Represents the number of geographical license areas.

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Represent the amount of payment for remaining balance of the winning bid price.

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Represents the percentage of bidding credit.

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The percentage rate used to calculate quarterly dividend payments on preferred stock.

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Reauction Payment

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Represents the obligation removal consent from unsecured financing and equipment financing

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Percentage of controlling interest owned by other companies.

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The number of wireless spectrum licenses acquired by the winning bidder.

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Wireless spectrum licenses accelerated period to meet final build-out requirement on failure to meet interim build out requirement.

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Represents the percentage of population in each area covered by an individual license to which the entity must provide reliable signal coverage and offer service by the end of license term.

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Represents the percentage of population in each area covered by an individual license to which the entity must provide reliable signal coverage and offer service within some specified period.

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Represents the minimum percentage of E Block population in each area covered by an individual license to which the entity must provide terrestrial signal coverage and offer terrestrial service by the end of license term.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of increase (decrease) in loans and leases receivable due from related parties.

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Portion of equity (net assets) in a variable interest entity (VIE) not attributable, directly or indirectly, to the parent entity. That is, this is the portion of equity in a VIE that is attributable to the noncontrolling interest (previously referred to as minority interest).

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The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Commitments and Contingencies (Details) $ in Millions												1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended	84 Months Ended	114 Months Ended	126 Months Ended	150 Months Ended
Commitments and Contingencies (Details) $ in Millions	Jun. 07, 2018 USD ($)	Jun. 06, 2018	Mar. 31, 2018 USD ($)	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	Jun. 30, 2018 USD ($) item	Dec. 31, 2008 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) item	Jun. 30, 2018 USD ($) 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
Commitments relating to AWS-3 Auction
Noncontrolling Interest in Variable Interest Entity														$ 10,000.0				10,000.0	$ 10,000.0
MVDDS Licenses
Spectrum Investments
Number of geographical license areas \| item														82
MVDDS Licenses \| Maximum
Spectrum Investments
Number of geographical license areas \| item														214
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	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
H Block Licenses \| Minimum
Spectrum Investments
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	$ 10.0	$ 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	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 \| SNR Licenses
Commitments relating to AWS-3 Auction
Number of licenses returned \| item														113
Northstar Spectrum And SNR Holdco \| Northstar Operative Agreement
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
Bidding credit value							$ 1,961.0
Northstar Wireless or Northstar Spectrum \| Preferred Class A
Spectrum Investments
Ownership percentage														100.00%
Northstar Wireless or Northstar Spectrum \| Class B common stock
Spectrum Investments
Ownership percentage														85.00%
Commitments relating to AWS-3 Auction
Controlling interest owned by other companies														15.00%
Northstar Wireless or Northstar Spectrum \| Northstar Manager LLC
Commitments relating to AWS-3 Auction
Equity contribution														$ 133.0
Northstar Wireless or Northstar Spectrum \| American II
Spectrum Investments
Loan made														$ 69.0
Additional days allowed for management to put its interest														90 days
Commitments relating to AWS-3 Auction
Equity contribution														$ 7,621.0
Northstar Wireless or Northstar Spectrum \| American II \| Maximum
Spectrum Investments
Preferred stock quarterly distribution (as a percent)														12.00%
Window of days for management to put its interest														90 days
Northstar Wireless or Northstar Spectrum \| American II \| Minimum
Spectrum Investments
Preferred stock quarterly distribution (as a percent)														8.00%
Window of days for management to put its interest														30 days
Northstar Wireless or Northstar Spectrum \| Northstar Licenses
Spectrum Investments
Number of wireless spectrum licenses \| item														261				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	$ 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
Spectrum Investments
Loan balance maturity period	10 years	7 years
Removal of consent for unsecured financing and equipment financing	$ 25.0
Northstar Wireless or Northstar Spectrum \| Northstar Operative Agreement \| Preferred Class A
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 \| Maximum
Spectrum Investments
Interest rate (as a percent)			12.00%										12.00%
Northstar Wireless or Northstar Spectrum \| Northstar Operative Agreement \| Minimum
Spectrum Investments
Interest rate (as a percent)			6.00%										6.00%
Northstar Wireless or Northstar Spectrum \| Northstar Operative Agreement \| Northstar Manager LLC
Spectrum Investments
Principal amount of debt														$ 500.0				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	500.0
Window of days for management to put its interest	90 days	30 days
Additional days allowed for management to put its interest	90 days
Commitments relating to AWS-3 Auction
Bidding credit value							$ 1,370.0
SNR Wireless or SNR Wireless Holdco \| Preferred Class A
Spectrum Investments
Ownership percentage														100.00%
Number shares issued in conversion \| item													5,065,415
Preferred stock quarterly distribution (as a percent)													12.00%
SNR Wireless or SNR Wireless Holdco \| Class B common stock
Spectrum Investments
Ownership percentage														85.00%
Commitments relating to AWS-3 Auction
Controlling interest owned by other companies														15.00%
SNR Wireless or SNR Wireless Holdco \| Maximum
Spectrum Investments
Preferred stock quarterly distribution (as a percent)	12.00%
SNR Wireless or SNR Wireless Holdco \| Minimum
Spectrum Investments
Preferred stock quarterly distribution (as a percent)	8.00%
SNR Wireless or SNR Wireless Holdco \| SNR Wireless Management LLC
Commitments relating to AWS-3 Auction
Equity contribution			93.0
SNR Wireless or SNR Wireless Holdco \| American III
Spectrum Investments
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
Spectrum Investments
Interim payment percentage														15.00%
SNR Wireless or SNR Wireless Holdco \| SNR Licenses
Spectrum Investments
Non-payment gross winning bids														$ 1,211.0				$ 1,211.0	$ 1,211.0
Additional Bid Withdrawal Payment														$ 3.0
SNR Wireless or SNR Wireless Holdco \| SNR Operative Agreement
Spectrum Investments
Loan balance maturity period	10 years	7 years
Removal of consent for unsecured financing and equipment financing	$ 25.0
SNR Wireless or SNR Wireless Holdco \| SNR Operative Agreement \| Preferred Class A
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 \| SNR Wireless or SNR Wireless Holdco
Spectrum Investments
Loan made			$ 500.0