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Commitments and Contingencies - Narrative Part 3 (Details) - USD ($)			9 Months Ended	165 Months Ended
	Jul. 26, 2019	Sep. 23, 2016	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2015
NTM
Commitments and Contingencies
Purchase price	$ 1,400,000,000
Prepaid Business Sale [Member]
Commitments and Contingencies
Payment to acquire certain wireless licenses and related assets			$ 3,590,000,000
Dish Network
Commitments and Contingencies
Payment to acquire certain wireless licenses and related assets				$ 12,000,000,000
Dish Network \| Spectrum Investments
Commitments and Contingencies
5G Network deployment			10,000,000,000
Northstar Spectrum And SNR Holdco
Commitments and Contingencies
Non-controlling investments						$ 10,000,000,000
Northstar Spectrum And SNR Holdco \| Dish Network
Commitments and Contingencies
Non-controlling investments			10,000,000,000	10,000,000,000	$ 10,000,000,000
Northstar Wireless or Northstar Spectrum \| AWS 3 Auction \| Vermont National Telephone Company
Commitments and Contingencies
Bidding credit credits		25.00%
Northstar Wireless or Northstar Spectrum \| AWS 3 Auction \| Vermont National Telephone Company \| Maximum
Commitments and Contingencies
Claim amount		$ 11,000
Northstar Wireless or Northstar Spectrum \| AWS 3 Auction \| Vermont National Telephone Company \| Minimum
Commitments and Contingencies
Claim amount		$ 5,500
ClearPlay, Inc.
Commitments and Contingencies
Loss contingency			$ 543,000,000	$ 543,000,000