Fresh Start Accounting (Fresh Start - Summary Of Components Of Property And Equipment, Net And Fair Value) (Details) $ in Millions	Apr. 30, 2021 USD ($)
Fair Value Adjustment [Member]
Fair Value Adjustment
Land	$ 40
Buildings and leasehold improvements	(958)
General support	(1,462)
Central office/electronic circuit equipment	(7,364)
Poles	(843)
Cable, fiber and wire	(8,755)
Conduit	(282)
Construction work in progress	18
Property, plant and equipment	(19,606)
Less: Accumulated depreciation	15,133
Property, plant and equipment, net	(4,473)
Predecessor [Member]
Historical Value
Land	209
Buildings and leasehold improvements	2,134
General support	1,635
Central office/electronic circuit equipment	8,333
Poles	1,359
Cable, fiber and wire	11,824
Conduit	1,611
Construction work in progress	1,048
Property, plant and equipment	28,153
Less: Accumulated depreciation	(15,133)
Property, plant and equipment, net	13,020
Successor [Member]
Fair Value
Land	249
Buildings and leasehold improvements	1,176
General support	173
Central office/electronic circuit equipment	969
Poles	516
Cable, fiber and wire	3,069
Conduit	1,329
Construction work in progress	1,066
Property, plant and equipment	8,547
Property, plant and equipment, net	$ 8,547