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Revenue Recognition - Disaggregation Of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of revenue        
Revenue from contracts with customers $ 1,292 $ 1,275 $ 3,765 $ 3,709
Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 1,001 995 2,963 2,920
Transferred over time | Retail service        
Disaggregation of revenue        
Revenue from contracts with customers 663 659 1,984 1,960
Transferred over time | Inbound roaming        
Disaggregation of revenue        
Revenue from contracts with customers 54 50 132 116
Transferred over time | Residential        
Disaggregation of revenue        
Revenue from contracts with customers 135 128 397 381
Transferred over time | Commercial        
Disaggregation of revenue        
Revenue from contracts with customers 52 56 159 170
Transferred over time | Wholesale        
Disaggregation of revenue        
Revenue from contracts with customers 44 50 137 143
Transferred over time | Other service        
Disaggregation of revenue        
Revenue from contracts with customers 53 52 154 150
Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers 291 280 802 789
U.S. Cellular        
Disaggregation of revenue        
Revenue from contracts with customers 1,008 985 2,915 2,867
U.S. Cellular | Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 751 743 2,217 2,175
U.S. Cellular | Transferred over time | Retail service        
Disaggregation of revenue        
Revenue from contracts with customers 663 659 1,984 1,960
U.S. Cellular | Transferred over time | Inbound roaming        
Disaggregation of revenue        
Revenue from contracts with customers 54 50 132 116
U.S. Cellular | Transferred over time | Residential        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
U.S. Cellular | Transferred over time | Commercial        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
U.S. Cellular | Transferred over time | Wholesale        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
U.S. Cellular | Transferred over time | Other service        
Disaggregation of revenue        
Revenue from contracts with customers 34 34 101 99
U.S. Cellular | Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers 257 242 698 692
TDS Telecom Total        
Disaggregation of revenue        
Revenue from contracts with customers 230 234 693 694
TDS Telecom Total | Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 230 233 692 693
TDS Telecom Total | Transferred over time | Retail service        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
TDS Telecom Total | Transferred over time | Inbound roaming        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
TDS Telecom Total | Transferred over time | Residential        
Disaggregation of revenue        
Revenue from contracts with customers 135 128 397 381
TDS Telecom Total | Transferred over time | Commercial        
Disaggregation of revenue        
Revenue from contracts with customers 52 56 159 170
TDS Telecom Total | Transferred over time | Wholesale        
Disaggregation of revenue        
Revenue from contracts with customers 44 50 137 143
TDS Telecom Total | Transferred over time | Other service        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 (1) (1)
TDS Telecom Total | Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 1 1
TDS Telecom Wireline        
Disaggregation of revenue        
Revenue from contracts with customers 168 176 511 525
TDS Telecom Wireline | Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 168 176 510 524
TDS Telecom Wireline | Transferred over time | Retail service        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
TDS Telecom Wireline | Transferred over time | Inbound roaming        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
TDS Telecom Wireline | Transferred over time | Residential        
Disaggregation of revenue        
Revenue from contracts with customers 83 81 245 241
TDS Telecom Wireline | Transferred over time | Commercial        
Disaggregation of revenue        
Revenue from contracts with customers 41 46 127 140
TDS Telecom Wireline | Transferred over time | Wholesale        
Disaggregation of revenue        
Revenue from contracts with customers 44 50 137 143
TDS Telecom Wireline | Transferred over time | Other service        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
TDS Telecom Wireline | Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 1 1
TDS Telecom Cable        
Disaggregation of revenue        
Revenue from contracts with customers 62 58 184 170
TDS Telecom Cable | Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 62 58 183 170
TDS Telecom Cable | Transferred over time | Retail service        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
TDS Telecom Cable | Transferred over time | Inbound roaming        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
TDS Telecom Cable | Transferred over time | Residential        
Disaggregation of revenue        
Revenue from contracts with customers 52 47 152 140
TDS Telecom Cable | Transferred over time | Commercial        
Disaggregation of revenue        
Revenue from contracts with customers 10 10 32 30
TDS Telecom Cable | Transferred over time | Wholesale        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
TDS Telecom Cable | Transferred over time | Other service        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
TDS Telecom Cable | Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
Corporate, Eliminations and Other        
Disaggregation of revenue        
Revenue from contracts with customers 53 56 157 148
Corporate, Eliminations and Other | Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 19 18 54 52
Corporate, Eliminations and Other | Transferred over time | Retail service        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
Corporate, Eliminations and Other | Transferred over time | Inbound roaming        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
Corporate, Eliminations and Other | Transferred over time | Residential        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
Corporate, Eliminations and Other | Transferred over time | Commercial        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
Corporate, Eliminations and Other | Transferred over time | Wholesale        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
Corporate, Eliminations and Other | Transferred over time | Other service        
Disaggregation of revenue        
Revenue from contracts with customers 19 18 54 52
Corporate, Eliminations and Other | Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers $ 34 $ 38 $ 103 $ 96