Property, Plant and Equipment Property, Plant and Equipment (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Jun. 30, 2013 Predecessor [Member]	Jun. 30, 2013 Predecessor [Member] iDEN and CDMA [Member]	Jun. 30, 2014 Successor [Member]
Property, Plant and Equipment [Line Items]
Restructuring and Related Cost, Accelerated Depreciation		$ 430
Property, Plant and Equipment, Additions	$ 340		$ 180

Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

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