Property, Plant and Equipment Property, Plant and Equipment (Narrative) (Details) (Predecessor [Member], iDEN and CDMA [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
Mar. 31, 2013	Jul. 10, 2013	Dec. 31, 2012
Predecessor [Member] \| iDEN and CDMA [Member]
Property, Plant and Equipment [Line Items]
Restructuring and Related Cost, Accelerated Depreciation	$ 360	$ 800	$ 2,100

Amount of accelerated depreciation charged against earnings associated with exit from or disposal of business activities or restructuring plan.

No definition available.

Name:	us-gaap_RestructuringReserveAcceleratedDepreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration