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Intangible Assets - Schedules (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill    
Balance, beginning of period $ 547 $ 509
Acquisitions 0 38
Balance, end of period 547 547
Finite-Lived Intangible Assets    
Gross Amount 284 304
Accumulated Amortization (71) (65)
Net Amount [1] 213 239
Franchise rights    
Finite-Lived Intangible Assets    
Gross Amount 255 255
Accumulated Amortization (51) (34)
Net Amount 204 221
Customer lists and Trade name    
Finite-Lived Intangible Assets    
Gross Amount 29 49
Accumulated Amortization (20) (31)
Net Amount 9 18
Wireline    
Schedule Of Indefinite Lived and Finite Lived Intangible Assets [Line Items]    
Accumulated impairment losses in prior periods 29  
Goodwill    
Balance, beginning of period 409 409
Acquisitions 0 0
Balance, end of period 409 409
Cable    
Goodwill    
Balance, beginning of period 138 100
Acquisitions 0 38
Balance, end of period 138 138
Licenses    
Licenses    
Balance, beginning of period 2,480 2,195
Acquisitions 171 267
Divestitures (18) (10)
Exchanges - Licenses received   26
Capitalized interest 5 2
Balance, end of period 2,638 2,480
Licenses | Wireline    
Licenses    
Balance, beginning of period 2 2
Acquisitions 0 0
Divestitures 0 0
Exchanges - Licenses received   0
Capitalized interest 0 0
Balance, end of period 2 2
Licenses | Cable    
Licenses    
Balance, beginning of period 3 3
Acquisitions 0 0
Divestitures 0 0
Exchanges - Licenses received   0
Capitalized interest 0 0
Balance, end of period 3 3
Licenses | UScellular    
Licenses    
Balance, beginning of period 2,475 2,190
Acquisitions 171 267
Divestitures (18) (10)
Exchanges - Licenses received   26
Capitalized interest 5 2
Balance, end of period $ 2,633 $ 2,475
[1] The accumulated amortization balance at December 31, 2019 differs from the amount reported in the Consolidated Balance Sheet of the 2019 Form 10-K, as the previously reported amount included certain intangible assets that were fully amortized and had a net book value of zero.