Description Of Business And Summary Of Significant Accounting Policies (Narrative) (Details) item in Millions	3 Months Ended	4 Months Ended	8 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($)	Apr. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) employee segment state item	Dec. 31, 2020 USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of subscribers | item				2.8
Number of states of operation | state				25
Debtor-in-possession financing costs		$ 15,000,000			$ 121,000,000
Annual support accepted for commitment for RDOF				$ 37,000,000
Number of employees | employee				14,700
Number of reportable segments | segment				1
Reorganization Items		(4,171,000,000)			409,000,000
Restricted cash				0
Short-term Investments				1,750,000,000
Customer surcharges		83,000,000			193,000,000
Lease Impairment	$ 44,000,000			$ 44,000,000
Revenue recognition period, FCC's CAF Phase II subsidies				7 years
Provided funding period, for construction of broadband networks				10 years
Other Current Assets [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Restricted cash			17,000,000
Other Assets [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Restricted cash			$ 34,000,000
Business And Wholesale [Member] | Minimum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Useful life				11 years
Business And Wholesale [Member] | Maximum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Useful life				16 years
Trademarks and Tradenames [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Useful life				5 years