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Commitments and Contingencies (Narrative) (Details)
$ in Millions
3 Months Ended
Apr. 19, 2012
USD ($)
Jun. 30, 2018
USD ($)
claim
Mar. 31, 2018
USD ($)
Commitments and Contingencies [Line Items]      
Minimum spectrum reconfiguration obligations   $ 2,800  
Document Period End Date   Jun. 30, 2018  
Total Payments directly attributable to performance under Report and Order   $ 3,600  
Payments directly attributable to performance under report and order, net change related to FCC licenses   21  
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   $ 115  
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    
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  
State and Local Jurisdiction [Member]      
Commitments and Contingencies [Line Items]      
Loss Contingency Accrual, Provision   $ 114