Summary Of Significant Accounting Policies (Narrative) (Details) $ in Millions	1 Months Ended	3 Months Ended	4 Months Ended	6 Months Ended
	Apr. 30, 2021 USD ($)	Mar. 31, 2022 USD ($)	Apr. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) 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				$ 2,300
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	$ (4,196)		(4,171)
Customer surcharges			$ 83