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Commitments and Contingencies (Narrative) (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Mar. 31, 2010
market
Sep. 30, 2011
years
market
mHZ
gHZ
site
Apr. 19, 2011
MHz licenses utilized in iDEN network  800 
Megahertz of 1.9 Gigahertz spectrum received in report and order  10 
Gigahertz  1.9 
Minimum spectrum reconfiguration obligations$ 2,800,000,000 $ 2,800,000,000 
Total Payments directly attributable to performance under Report and Order3,000,000,000 3,000,000,000 
Payments directly attributable to performance under report and order, net change related to FCC licenses  193,000,000 
Licensees reimbursed share of costs  200,000,000 
Number of Markets where licensees have not moved off of replacement channels 219 
Minimum Cash Commitment Due Within One Year   300,000,000
Minimum Cash Commitment Due In The Second Year   550,000,000
Refundable Prepayment for Additional Usage   175,000,000
Long-term Purchase Commitment, Time Period4   
Long-term Purchase Commitment, Amount15,500,000,000   
Increase in operating lease costs  2,300,000,000 
Letter Of Credit Required By The FCCs Report And Order [Member]
    
Original Letter of Credit Required by FCC Report and Order2,500,000,000 2,500,000,000 
Letters of Credit Outstanding, Amount$ 1,100,000,000 $ 1,100,000,000