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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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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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Amount of expected expenditures for the second phase of our network deployment.

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Expenditures For Wireless Projects

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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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Number Of Licenses Returned

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Overpayment Of Interim Payment

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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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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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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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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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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		12 Months Ended	84 Months Ended	135 Months Ended
Commitments and Contingencies (Details) $ in Millions	Jun. 07, 2018 USD ($)	Jun. 06, 2018	May 11, 2017 USD ($)	Jul. 01, 2016 USD ($)	Aug. 18, 2015 USD ($)	Apr. 29, 2014 USD ($) segment	Oct. 29, 2013	Mar. 09, 2012 USD ($)	Mar. 09, 2012	Jan. 31, 2017	Mar. 31, 2019 USD ($) item	Mar. 31, 2018 USD ($) item	Dec. 31, 2008 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)	Apr. 13, 2017 USD ($) item
Spectrum Investments
Expected expenditures for second phase of network deployment											$ 10,000.0				$ 10,000.0
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
Maximum
Spectrum Investments
Expected expenditures for wireless projects											1,000.0				1,000.0
Minimum
Spectrum Investments
Expected expenditures for wireless projects											$ 500.0				500.0
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
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%
Prior Arrangement \| Northstar Licenses
Spectrum Investments
Non-payment gross winning bids											$ 2,226.0				2,226.0
Northstar Spectrum And SNR Holdco
Commitments relating to AWS-3 Auction
Noncontrolling Interest in Variable Interest Entity											$ 10.0				$ 10.0	$ 10,000.0
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 \| SNR Licenses
Commitments relating to AWS-3 Auction
Percentage of bidding credit					25.00%
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 \| American II
Spectrum Investments
Debt outstanding amount												$ 6,870.0
Northstar Wireless or Northstar Spectrum
Spectrum Investments
Interim payment percentage											15.00%
Re-Auction payment											$ 1,892.0
Overpayment Of Interim Payment											$ 334.0
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
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
Equity contribution												7,621.0
Northstar Wireless or Northstar Spectrum \| American II \| Maximum
Spectrum Investments
Preferred stock quarterly distribution (as a percent)	12.00%
Northstar Wireless or Northstar Spectrum \| American II \| Minimum
Spectrum Investments
Preferred stock quarterly distribution (as a percent)	8.00%
Northstar Wireless or Northstar Spectrum \| AWS 3 Auction
Spectrum Investments
Interim Payment											$ 334.0
Interim payment percentage											15.00%
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
Bidding credit value					$ 1,961.0
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%
Net winning bid											$ 5,884.0
Number of licenses returned \| item											84
Northstar Wireless or Northstar Spectrum \| Northstar Operative Agreement \| American II
Spectrum Investments
Principal amount of debt												$ 500.0
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 \| American II \| Preferred Class A
Spectrum Investments
Number shares issued in conversion												6,870,493
Preferred stock quarterly distribution (as a percent)												12.00%
Northstar Wireless or Northstar Spectrum \| Northstar Operative Agreement \| American II \| Maximum
Spectrum Investments
Interest rate (as a percent)												12.00%
Northstar Wireless or Northstar Spectrum \| Northstar Operative Agreement \| American II \| Minimum
Spectrum Investments
Interest rate (as a percent)												6.00%
SNR Wireless or SNR Wireless Holdco
Spectrum Investments
Re-Auction payment											$ 1,029.0
Overpayment Of Interim Payment											$ 182.0
SNR Wireless or SNR Wireless Holdco \| Preferred Class A
Spectrum Investments
Ownership percentage											100.00%
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
Debt outstanding amount												5,065.0
Principal amount of debt												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
Equity contribution												$ 5,590.0
Gross winning bids											$ 4,271.0
SNR Wireless or SNR Wireless Holdco \| American III \| Preferred Class A
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 \| American III \| Maximum
Spectrum Investments
Interest rate (as a percent)												12.00%
SNR Wireless or SNR Wireless Holdco \| American III \| Minimum
Spectrum Investments
Interest rate (as a percent)											6.00%				6.00%
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
Spectrum Investments
Non-payment gross winning bids											$ 1,211.0				$ 1,211.0
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
Interim Payment											$ 182.0
Non-payment gross winning bids											1,211.0				$ 1,211.0
Additional Bid Withdrawal Payment											$ 3.0
Commitments relating to AWS-3 Auction
Bidding credit value					$ 1,370.0
SNR Wireless or SNR Wireless Holdco \| SNR Operative Agreement \| American III
Spectrum Investments
Loan balance maturity period	10 years	7 years
Removal of consent for unsecured financing and equipment financing	$ 25.0
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
Northstar Credit Agreement \| Northstar Wireless or Northstar Spectrum \| American II
Spectrum Investments
Loan made												$ 500.0