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Basis of Presentation (Details 2) (USD $)
In Millions, unless otherwise specified
0 Months Ended
Jun. 30, 2012
item
Apr. 02, 2012
Qwest Corporation
Office building
Basis of Presentation    
Reclassification from other intangible assets, net to current assets other $ 154  
Number of purchasers 2  
Proceeds from sale of administrative building   133
Amount of gain from sale of office building deferred   $ 16
Lease term   10 years