Severance, Exit Costs and Asset Impairments Severance, Exit Costs and Asset Impairments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2014
Successor [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 6	[1]
Lease and access exit costs [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring And Related Cost Expected Future Cost	150
Lease and access exit costs [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring And Related Cost Expected Future Cost	250
Wireless [Member] | Successor [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	5	[1]
Wireline [Member] | Successor [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 1	[1]

[1] (2)For the Successor three-month period ended June 30, 2014, we recognized costs of $6 million ($5 million Wireless, $1 million Wireline).