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Intangible Assets - Schedules (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Goodwill      
Balance, beginning of period   $ 509,000,000 $ 766,000,000
Acquisitions     5,000,000
Loss on impairment     (262,000,000)
Other   0  
Balance, end of period   509,000,000 509,000,000
Finite-Lived Intangible Assets      
Gross Amount   421,000,000 421,000,000
Accumulated Amortization   (168,000,000) (142,000,000)
Net Amount   253,000,000 279,000,000
Franchise rights      
Finite-Lived Intangible Assets      
Gross Amount   255,000,000 255,000,000
Accumulated Amortization   (17,000,000) 0
Net Amount   238,000,000 255,000,000
Customer lists and Trade name      
Finite-Lived Intangible Assets      
Gross Amount   166,000,000 166,000,000
Accumulated Amortization   (151,000,000) (142,000,000)
Net Amount   15,000,000 24,000,000
U.S. Cellular      
Goodwill      
Balance, beginning of period   0 227,000,000
Acquisitions     0
Loss on impairment $ (227,000,000)   (227,000,000)
Other   0  
Balance, end of period $ 0 0 0
Wireline      
Goodwill      
Balance, beginning of period   409,000,000 409,000,000
Acquisitions     0
Loss on impairment     0
Other   0  
Balance, end of period   409,000,000 409,000,000
Cable      
Goodwill      
Balance, beginning of period   100,000,000 95,000,000
Acquisitions     5,000,000
Loss on impairment     0
Other   0  
Balance, end of period   100,000,000 100,000,000
Other      
Goodwill      
Balance, beginning of period   0 35,000,000
Acquisitions     0
Loss on impairment     (35,000,000)
Other   0  
Balance, end of period   0 0
Licenses      
Licenses      
Balance, beginning of period   2,232,000,000 1,895,000,000
Acquisitions   8,000,000 331,000,000
Transferred to Assets held for sale   (51,000,000) (10,000,000)
Divestitures   (11,000,000)  
Exchanges - Licenses received   18,000,000 25,000,000
Exchanges - Licenses surrendered   (1,000,000) (9,000,000)
Balance, end of period   2,195,000,000 2,232,000,000
Licenses | U.S. Cellular      
Licenses      
Balance, beginning of period   2,227,000,000 1,890,000,000
Acquisitions   8,000,000 331,000,000
Transferred to Assets held for sale   (51,000,000) (10,000,000)
Divestitures   (11,000,000)  
Exchanges - Licenses received   18,000,000 25,000,000
Exchanges - Licenses surrendered   (1,000,000) (9,000,000)
Balance, end of period   2,190,000,000 2,227,000,000
Licenses | Wireline      
Licenses      
Balance, beginning of period   2,000,000 2,000,000
Acquisitions   0 0
Transferred to Assets held for sale   0 0
Divestitures   0  
Exchanges - Licenses received   0 0
Exchanges - Licenses surrendered   0 0
Balance, end of period   2,000,000 2,000,000
Licenses | Cable      
Licenses      
Balance, beginning of period   3,000,000 3,000,000
Acquisitions   0 0
Transferred to Assets held for sale   0 0
Divestitures   0  
Exchanges - Licenses received   0 0
Exchanges - Licenses surrendered   0 0
Balance, end of period   $ 3,000,000 $ 3,000,000