Property, Plant and Equipment (Components of Property Plant and Equipment) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Successor [Member]
Property, Plant and Equipment [Line Items]
Less accumulated depreciation	$ (885)
Property, plant and equipment, net	15,312	0
Successor [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	265
Successor [Member] | Network equipment, site costs and related software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	11,764
Successor [Member] | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	711
Successor [Member] | Non-network internal use software, office equipment and other [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	655
Successor [Member] | Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Construction in progress	2,802
Predecessor [Member]
Property, Plant and Equipment [Line Items]
Less accumulated depreciation		(34,291)
Property, plant and equipment, net		13,607
Predecessor [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment		330
Predecessor [Member] | Network equipment, site costs and related software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment		37,692
Predecessor [Member] | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment		4,893
Predecessor [Member] | Non-network internal use software, office equipment and other [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment		1,860
Predecessor [Member] | Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Construction in progress		$ 3,123