Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	3 Months Ended
	Sep. 30, 2012 mHZ gHZ	Sep. 30, 2012 Customer Relationships [Member]
Acquired Finite-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
Reduction In Carrying Value And Accumulated Amortization Of Fully Amortized Intangible Assets		$ 107