Fresh Start Accounting (Fresh Start - Summary Of Components Of Property And Equipment, Net And Fair Value) (Details) - USD ($) $ in Millions	Apr. 30, 2021	Jun. 30, 2020
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	$ 8,547