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Acquisitions, Divestitures and Exchanges (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Feb. 29, 2016
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Acquisitions                
Cash paid for acquisitions and licenses             $ 200 $ 46
Federal Communications Commission deposit               143
Exchanges                
Cash received from divestitures and exchanges             17 17
Gain on license sales and exchanges       $ 2   $ 9 19 9
U.S. Cellular                
Exchanges                
Gain on license sales and exchanges       2   9 $ 19 $ 9
U.S. Cellular | License exchange 1                
Exchanges                
Net cash to be received     $ 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 1, second closing                
Exchanges                
Cash received from divestitures and exchanges         $ 15      
Gain on license sales and exchanges         $ 17      
U.S. Cellular | Auction 1002                
Acquisitions                
Cash paid for acquisitions and licenses       $ 186        
Federal Communications Commission deposit   $ 143            
Fcc License Auction Total Licenses Won 188              
Fcc License Auction Total Winning Bid $ 329