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Acquisitions And Divestitures Acquisition of Unwired Holdings, Inc. (Details) - USD ($)
$ in Millions
Oct. 01, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Goodwill   $ 1,539 $ 656 $ 496
Unwired Holdings, Inc.        
Business Acquisition [Line Items]        
Business Acquisition, Percentage of Equity Interests Acquired 100.00%      
Purchase price, cash consideration $ 191      
Acquired cash excess net working capital and certain tax benefits 19      
Total consideration transferred 210      
Definite-lived intangible assets 63      
Other assets purchased and liabilities assumed, net 17      
Identifiable net assets acquired 80      
Goodwill 130      
Total purchase price allocation $ 210      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 10 years