Spectrum Hosting (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Period Sprint entered into the arrangement with LightSquared LP and LightSquared Inc.			15 years
Cash received for Spectrum Hosting Arrangement			$ 310
Spectrum Hosting Revenue	7	236	236	0	0
Amount of advanced payment refunded by the Company			67
Asset Impairment Charges			102	78	125
Net gain related to termination of spectrum hosting arrangement			170
Capitalized assets specific to the spectrum hosting [Member]
Property, Plant and Equipment [Line Items]
Asset Impairment Charges			$ 66