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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of revenue        
Revenue from contracts with customers $ 1,320 $ 1,284 $ 2,604 $ 2,575
Operating lease income 29 27 60 54
Total operating revenues 1,349 1,311 2,664 2,629
Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 1,035 1,022 2,065 2,037
Transferred over time | Retail service        
Disaggregation of revenue        
Revenue from contracts with customers 700 684 1,402 1,367
Transferred over time | Inbound roaming        
Disaggregation of revenue        
Revenue from contracts with customers 18 28 39 56
Transferred over time | Residential        
Disaggregation of revenue        
Revenue from contracts with customers 168 160 330 317
Transferred over time | Commercial        
Disaggregation of revenue        
Revenue from contracts with customers 44 46 87 93
Transferred over time | Wholesale        
Disaggregation of revenue        
Revenue from contracts with customers 44 44 87 89
Transferred over time | Other service        
Disaggregation of revenue        
Revenue from contracts with customers 61 60 120 115
Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers 285 262 539 538
UScellular        
Disaggregation of revenue        
Revenue from contracts with customers 1,004 994 1,992 1,996
Operating lease income 23 20 45 41
Total operating revenues 1,027 1,014 2,037 2,037
UScellular | Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 760 754 1,525 1,504
UScellular | Transferred over time | Retail service        
Disaggregation of revenue        
Revenue from contracts with customers 700 684 1,402 1,367
UScellular | Transferred over time | Retail service | Prior period reclassification        
Disaggregation of revenue        
Revenue from contracts with customers   (2)   (4)
UScellular | Transferred over time | Inbound roaming        
Disaggregation of revenue        
Revenue from contracts with customers 18 28 39 56
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 42 42 84 81
UScellular | Transferred over time | Other service | Prior period reclassification        
Disaggregation of revenue        
Revenue from contracts with customers   2   4
UScellular | Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers 244 240 467 492
TDS Telecom        
Disaggregation of revenue        
Revenue from contracts with customers 255 251 506 499
Operating lease income 1 1 2 1
Total operating revenues 256 252 507 501
TDS Telecom | Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 255 251 505 499
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 168 160 330 317
TDS Telecom | Transferred over time | Commercial        
Disaggregation of revenue        
Revenue from contracts with customers 44 46 87 93
TDS Telecom | Transferred over time | Wholesale        
Disaggregation of revenue        
Revenue from contracts with customers 44 44 87 89
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 60 39 107 79
Operating lease income 6 6 13 12
Total operating revenues 66 45 120 91
Corporate, Eliminations and Other | Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 19 18 36 34
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 36 34
Corporate, Eliminations and Other | Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers $ 41 $ 22 $ 71 $ 45