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Acquisitions, Divestitures and Exchanges (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Mar. 31, 2016
Feb. 29, 2016
Acquisitions              
Cash paid for acquisitions and licenses       $ 46 $ 287    
Federal Communications Commission deposit   $ 143   143      
Exchanges              
Assets held for sale $ 16     16      
Cash received from divestitures and exchanges       20 325    
Gain on license sales and exchanges 7   $ 24 16 147    
U.S. Cellular              
Exchanges              
Gain on license sales and exchanges 7   $ 24 16 $ 147    
U.S. Cellular | License exchange 1              
Exchanges              
Assets held for sale 8     8      
Net cash to be received (paid)             $ 28
U.S. Cellular | License exchange 1, first closing              
Exchanges              
Cash received from divestitures and exchanges   13          
Gain on license sales and exchanges   9          
U.S. Cellular | License exchange 2              
Exchanges              
Cash received from divestitures and exchanges 2            
Carrying value of licenses disposed of in exchange 7            
Gain on license sales and exchanges 7            
U.S. Cellular | License exchange 3              
Exchanges              
Assets held for sale 8     8      
Net cash to be received (paid)           $ (1)  
U.S. Cellular | License Acquisitions | Aggregate license acquisitions              
Acquisitions              
License acquisition agreement amount $ 56     $ 56      
Cash paid for acquisitions and licenses   $ 46