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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of revenue        
Revenue from contracts with customers $ 1,284 $ 1,237 $ 2,575 $ 2,472
Operating lease income 27 26 54 52
Total operating revenues 1,311 1,263 2,629 2,524
Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 1,022 990 2,037 1,990
Transferred over time | Retail service        
Disaggregation of revenue        
Revenue from contracts with customers 686 658 1,371 1,329
Transferred over time | Inbound roaming        
Disaggregation of revenue        
Revenue from contracts with customers 28 41 56 77
Transferred over time | Residential        
Disaggregation of revenue        
Revenue from contracts with customers 160 145 317 289
Transferred over time | Commercial        
Disaggregation of revenue        
Revenue from contracts with customers 46 48 93 98
Transferred over time | Wholesale        
Disaggregation of revenue        
Revenue from contracts with customers 44 46 89 92
Transferred over time | Other service        
Disaggregation of revenue        
Revenue from contracts with customers 58 52 111 106
Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers 262 247 538 482
UScellular        
Disaggregation of revenue        
Revenue from contracts with customers 994 954 1,996 1,899
Operating lease income 20 19 41 38
Total operating revenues 1,014 973 2,037 1,937
UScellular | Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 754 734 1,504 1,477
UScellular | Transferred over time | Retail service        
Disaggregation of revenue        
Revenue from contracts with customers 686 658 1,371 1,329
UScellular | Transferred over time | Inbound roaming        
Disaggregation of revenue        
Revenue from contracts with customers 28 41 56 77
UScellular | Transferred over time | Residential        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
UScellular | Transferred over time | Commercial        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
UScellular | Transferred over time | Wholesale        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
UScellular | Transferred over time | Other service        
Disaggregation of revenue        
Revenue from contracts with customers 40 35 77 71
UScellular | Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers 240 220 492 422
TDS Telecom        
Disaggregation of revenue        
Revenue from contracts with customers 251 240 499 479
Operating lease income 1 1 1 2
Total operating revenues 252 241 501 481
TDS Telecom | Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 251 239 499 479
TDS Telecom | Transferred over time | Retail service        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
TDS Telecom | Transferred over time | Inbound roaming        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
TDS Telecom | Transferred over time | Residential        
Disaggregation of revenue        
Revenue from contracts with customers 160 145 317 289
TDS Telecom | Transferred over time | Commercial        
Disaggregation of revenue        
Revenue from contracts with customers 46 48 93 98
TDS Telecom | Transferred over time | Wholesale        
Disaggregation of revenue        
Revenue from contracts with customers 44 46 89 92
TDS Telecom | Transferred over time | Other service        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 0 0
TDS Telecom | Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers 0 0 1 1
Corporate, Eliminations and Other        
Disaggregation of revenue        
Revenue from contracts with customers 39 43 79 94
Operating lease income 6 6 12 12
Total operating revenues 45 49 91 106
Corporate, Eliminations and Other | Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 18 17 34 35
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 18 17 34 35
Corporate, Eliminations and Other | Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers $ 22 $ 27 $ 45 $ 59