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Funding Sources Handset Sale-Leaseback (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2016
Nov. 30, 2015
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Nov. 19, 2015
Sale Leaseback Transaction [Line Items]            
Document Period End Date     Jun. 30, 2016      
Sale Leaseback Transaction, Net Book Value     $ 500 $ 1,200 $ 1,300  
Leased handset [Member]            
Sale Leaseback Transaction [Line Items]            
Sale Leaseback Transaction, Net Proceeds, Investing Activities   $ 1,100        
Receivables from sale-leaseback           $ 126
Gain (Loss) on Disposition of Property Plant Equipment   $ 65        
Sale Leaseback Transaction, Rent Expense     197      
Sale Leaseback Transaction, Monthly Rental Payments     60      
MLS 2nd Tranche [Member]            
Sale Leaseback Transaction [Line Items]            
Sale Leaseback Transaction, Net Book Value $ 1,300   $ 889      
Sale Leaseback Transaction, Net Proceeds, Investing Activities 1,100          
Receivables from sale-leaseback $ 186