Summary Of Significant Accounting Policies (Narrative) (Details) $ in Millions	3 Months Ended	4 Months Ended	9 Months Ended
	Mar. 31, 2022 USD ($)	Apr. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) segment	Dec. 31, 2021 USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Annual support accepted for commitment for RDOF			$ 37
Number of reportable segments | segment			1
Restricted cash, current			$ 17
Restricted cash, noncurrent			30	$ 34
Short-term Investments			$ 2,325
Revenue recognition period, FCC's CAF Phase II subsidies			7 years
Provided funding period, for construction of broadband networks			10 years
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
Successor [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Lease Impairment	$ 44		$ 44
Predecessor [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Gain on settlement of liabilities		$ 5,274
Fresh start valuation adjustment charges		1,038
Debtor-in-possession financing costs		15
Reorganization item, professional fees and other bankruptcy related costs		50
Reorganization Items		(4,171)
Customer surcharges		$ 83
Contract acquisition costs period			4 years