Property, Plant and Equipment (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013 site	Jun. 30, 2012	Jun. 30, 2013 site	Jun. 30, 2012	Dec. 31, 2012 site
Property, Plant and Equipment [Line Items]
Number of cell sites taken off-air	20,000		20,000		9,600
Reduction In Gross Carrying Value and Accumulated Depreciation Of Fully Depreciated Assets			$ 8,400,000,000
Interest Costs Capitalized	13,000,000	102,000,000	28,000,000	217,000,000
Property, Plant and Equipment, Additions			790,000,000
Weighted Average [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			8 years
iDEN and CDMA [Member]
Property, Plant and Equipment [Line Items]
Depreciation	$ 430,000,000	$ 782,000,000	$ 790,000,000	$ 1,300,000,000