Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013 mHZ gHZ	Jun. 30, 2013 Customer Relationships [Member]	May 17, 2013 FCC Licenses [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Gigahertz (GHz) licenses utilized in the code division multiple access network	1.9
MHz licenses utilized in iDEN network	800
MHz licenses utilized in the integrated digital enhanced network	900
Fair value of indefinite lived intangible assets acquired in asset acquisition transaction			$ 605
Business Acquisition, Purchase Price Allocation, Goodwill Amount	9
Acquired Finite-lived Intangible Asset, Amount		32
Reduction In Carrying Value And Accumulated Amortization Of Fully Amortized Intangible Assets		$ 234