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Severance and Exit Costs (Schedule of Severance and Exit Costs) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]    
Document Period End Date Jun. 30, 2017  
Restructuring Reserve [Roll Forward]    
Restructuring Reserve $ 258 $ 301
Supplemental Unemployment Benefits, Severance Benefits 10 12
Restructuring Charges 0  
Severance Costs 5  
Payments for Postemployment Benefits (7)  
Restructuring Reserve, Settled with Cash (43)  
Lease [Member]    
Restructuring Reserve [Roll Forward]    
Restructuring Reserve 211 249
Restructuring Charges (9)  
Restructuring reserved settled with cash and other adjustments (29)  
Access [Member]    
Restructuring Reserve [Roll Forward]    
Restructuring Reserve 37 $ 40
Restructuring Charges 4  
Restructuring reserved settled with cash and other adjustments (7)  
Wireless [Member]    
Restructuring Reserve [Roll Forward]    
Severance Costs 3  
Wireless [Member] | Lease [Member]    
Restructuring Reserve [Roll Forward]    
Restructuring Charges (9)  
Wireline [Member]    
Restructuring Reserve [Roll Forward]    
Severance Costs $ 2