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Severance and Exit Costs (Schedule of Severance and Exit Costs) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]      
Document Period End Date   Dec. 31, 2017  
Restructuring Reserve [Roll Forward]      
Restructuring Reserve $ 208 $ 208 $ 301
Supplemental Unemployment Benefits, Severance Benefits 17 17 12
Restructuring Charges   13  
Severance Costs 17 22  
Payments for Postemployment Benefits   (17)  
Restructuring Reserve, Settled with Cash   (106)  
Lease [Member]      
Restructuring Reserve [Roll Forward]      
Restructuring Reserve 169 169 249
Restructuring reserved settled with cash and other adjustments   (68)  
Access [Member]      
Restructuring Reserve [Roll Forward]      
Restructuring Reserve 22 22 $ 40
Restructuring reserved settled with cash and other adjustments   (21)  
Wireless [Member]      
Restructuring Reserve [Roll Forward]      
Severance Costs   19  
Wireless [Member] | Lease [Member]      
Restructuring Reserve [Roll Forward]      
Restructuring Charges (3) (12)  
Wireline [Member]      
Restructuring Reserve [Roll Forward]      
Severance Costs 1 3  
Severance and exit costs [Member] | Access [Member]      
Restructuring Reserve [Roll Forward]      
Restructuring Charges (1) 3  
Severance and exit costs [Member] | Wireless [Member] | Access [Member]      
Restructuring Reserve [Roll Forward]      
Restructuring Charges (9) (8)  
Severance and exit costs [Member] | Wireline [Member] | Access [Member]      
Restructuring Reserve [Roll Forward]      
Restructuring Charges $ 8 $ 11