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Segments (Operating Revenues by Service and Products) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Other Operating Expenses Net $ 42 $ (364) $ (611)
Gain (Loss) on Disposition of Property Plant Equipment (175)    
Restructuring Charges 8    
Net operating revenues 8,125 8,157  
Segment Reporting Information, Total Net Operating Revenues 8,125 8,157 24,356
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property (124) (293)  
Other Products or Services [Member]      
Segment Reporting Information [Line Items]      
Segment Reporting Information, Total Net Operating Revenues 318 283  
Services [Member]      
Segment Reporting Information [Line Items]      
Segment Reporting Information, Total Net Operating Revenues 5,422 5,788  
Wireless Equipment Sales [Member]      
Segment Reporting Information [Line Items]      
Segment Reporting Information, Total Net Operating Revenues 1,173 1,187  
Wireless Equipment Rentals [Member]      
Segment Reporting Information [Line Items]      
Segment Reporting Information, Total Net Operating Revenues 1,212 899  
Wireless [Member]      
Segment Reporting Information [Line Items]      
Gain (Loss) on Contract Termination (5)   34
Net operating revenues 7,845 7,810  
Segment Reporting Information, Total Net Operating Revenues   7,810  
Wireless [Member] | Wireless Service [Member]      
Segment Reporting Information [Line Items]      
Net operating revenues   82  
Wireless [Member] | Other Products or Services [Member]      
Segment Reporting Information [Line Items]      
Net operating revenues 290 259  
Wireless [Member] | Services [Member]      
Segment Reporting Information [Line Items]      
Net operating revenues 5,170 5,465  
Wireless [Member] | Wireless Equipment Sales [Member]      
Segment Reporting Information [Line Items]      
Net operating revenues 1,173 1,187  
Wireless [Member] | Wireless Equipment Rentals [Member]      
Segment Reporting Information [Line Items]      
Net operating revenues 1,212 899  
Wireline [Member]      
Segment Reporting Information [Line Items]      
Net operating revenues 338 433  
Segment Reporting Information, Total Net Operating Revenues 276 343 963
Wireline [Member] | Other Products or Services [Member]      
Segment Reporting Information [Line Items]      
Net operating revenues 24 20  
Wireline [Member] | Services [Member]      
Segment Reporting Information [Line Items]      
Net operating revenues 314 413  
Wireline [Member] | Wireless Equipment Sales [Member]      
Segment Reporting Information [Line Items]      
Net operating revenues 0 0  
Wireline [Member] | Wireless Equipment Rentals [Member]      
Segment Reporting Information [Line Items]      
Net operating revenues 0 0  
Corporate, Other And Eliminations [Member]      
Segment Reporting Information [Line Items]      
Net operating revenues (58) (86)  
Segment Reporting Information, Total Net Operating Revenues 4 4 13
Corporate, Other And Eliminations [Member] | Other Products or Services [Member]      
Segment Reporting Information [Line Items]      
Net operating revenues 4 4  
Corporate, Other And Eliminations [Member] | Services [Member]      
Segment Reporting Information [Line Items]      
Net operating revenues (62) (90)  
Corporate, Other And Eliminations [Member] | Wireless Equipment Sales [Member]      
Segment Reporting Information [Line Items]      
Net operating revenues 0 0  
Corporate, Other And Eliminations [Member] | Wireless Equipment Rentals [Member]      
Segment Reporting Information [Line Items]      
Net operating revenues 0 0  
Lease and severance [Member]      
Segment Reporting Information [Line Items]      
Severance and exit costs 8    
Lease [Member] | Wireless [Member]      
Segment Reporting Information [Line Items]      
Restructuring Charges 0    
Network equipment, site costs and related software [Member]      
Segment Reporting Information [Line Items]      
Gain (Loss) on Disposition of Property Plant Equipment 181    
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property   175  
Other Property [Member]      
Segment Reporting Information [Line Items]      
Gain (Loss) on Disposition of Property Plant Equipment (6) (6)  
Write-off leased devices [Member]      
Segment Reporting Information [Line Items]      
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property 124 112  
Other, Net [Member]      
Segment Reporting Information [Line Items]      
Other Operating Expenses Net     $ 100
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property 124 287  
Gain (Loss) on Disposition of Intangible Assets $ 479    
State and Local Jurisdiction [Member] | Other, Net [Member]      
Segment Reporting Information [Line Items]      
Loss Contingency, Loss in Period   $ (55)