Property, Plant, And Equipment (Property, Plant And Equipment, Net) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Apr. 30, 2021	Dec. 31, 2020
Land [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	N/A
Buildings and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	40 years
General Support [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 to 15 years
Central Office Electronic Circuit Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 to 8 years
Poles [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	30 years
Cable, Fiber and Wire [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	15 to 25 years
Conduit [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	50 years
Successor [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 9,707	$ 8,547
Less: Accumulated depreciation	(508)
Property, plant and equipment, net	9,199	8,547
Successor [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	251
Successor [Member] | Buildings and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,195
Successor [Member] | General Support [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	212
Successor [Member] | Central Office Electronic Circuit Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,266
Successor [Member] | Poles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	677
Successor [Member] | Cable, Fiber and Wire [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	4,101
Successor [Member] | Conduit [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,374
Successor [Member] | Construction Work In Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 631
Predecessor [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment		28,153	$ 27,695
Less: Accumulated depreciation		(15,133)	(14,764)
Property, plant and equipment, net		$ 13,020	12,931
Predecessor [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment			212
Predecessor [Member] | Buildings and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment			2,139
Predecessor [Member] | General Support [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment			1,643
Predecessor [Member] | Central Office Electronic Circuit Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment			8,270
Predecessor [Member] | Poles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment			1,371
Predecessor [Member] | Cable, Fiber and Wire [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment			11,883
Predecessor [Member] | Conduit [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment			1,619
Predecessor [Member] | Construction Work In Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment			$ 558