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Commitments and Contingencies (Narrative) (Details)
$ in Millions
3 Months Ended
Apr. 19, 2012
USD ($)
Jun. 30, 2016
USD ($)
claim
Jun. 30, 2015
USD ($)
Mar. 31, 2016
USD ($)
Commitments and Contingencies [Line Items]        
Loss Contingency Accrual, Provision     $ 91  
Minimum spectrum reconfiguration obligations   $ 2,800    
Document Period End Date   Jun. 30, 2016    
Total Payments directly attributable to performance under Report and Order   $ 3,500    
Payments directly attributable to performance under report and order, net change related to FCC licenses   17    
Unsecured Revolving Credit Facility expires in 2018 [Member] | Letter Of Credit Required By The FCCs Report And Order [Member]        
Commitments and Contingencies [Line Items]        
Initial Letter of Credit Requirement       $ 2,500
Letters of Credit Outstanding, Amount   $ 256    
Stockholder Derivative Suit 2009 [Member]        
Commitments and Contingencies [Line Items]        
Loss Contingency, Pending Claims, Number | claim   5    
New York sales taxes on receipts from sale of wireless services [Member]        
Commitments and Contingencies [Line Items]        
Sales receipts alleged to not be reported, amount $ 100      
Loss Contingency Accrual, Provision   $ 180    
Derivative Shareholder Suits [Member]        
Commitments and Contingencies [Line Items]        
Loss Contingency, New Claims Filed, Number | claim   8    
Louisiana Municipal Police Employees Retirement System [Member]        
Commitments and Contingencies [Line Items]        
Loss Contingency, Claims Dismissed, Number | claim   1    
Johnson County Kansas [Member]        
Commitments and Contingencies [Line Items]        
Loss Contingency, New Claims Filed, Number | claim   2    
Loss Contingency, Claims Dismissed, Number | claim   1    
Federal Court of Kansas [Member]        
Commitments and Contingencies [Line Items]        
Loss Contingency, Pending Claims, Number | claim   5