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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of revenue        
Revenue from contracts with customers $ 1,300 $ 1,297 $ 3,875 $ 3,770
Operating lease income 28 27 82 79
Total operating revenues 1,328 1,324 $ 3,957 3,849
Immaterial error correction     During the three months ended September 30, 2021, UScellular recorded a $9 million out-of-period error related to the timing of recognition of regulatory fee billings. This adjustment had the impact of increasing Service revenue by $9 million for the three and nine months ended September 30, 2021. UScellular determined that this adjustment was not material to any of the periods impacted.  
Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 1,037 1,019 $ 3,074 3,009
Transferred over time | Retail service        
Disaggregation of revenue        
Revenue from contracts with customers 699 674 2,069 2,004
Transferred over time | Inbound roaming        
Disaggregation of revenue        
Revenue from contracts with customers 30 42 86 119
Transferred over time | Residential        
Disaggregation of revenue        
Revenue from contracts with customers 162 152 479 441
Transferred over time | Commercial        
Disaggregation of revenue        
Revenue from contracts with customers 45 48 138 146
Transferred over time | Wholesale        
Disaggregation of revenue        
Revenue from contracts with customers 43 45 132 137
Transferred over time | Other service        
Disaggregation of revenue        
Revenue from contracts with customers 57 57 170 161
Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers 263 278 801 761
UScellular        
Disaggregation of revenue        
Revenue from contracts with customers 995 1,007 2,992 2,907
Operating lease income 21 20 61 57
Total operating revenues 1,016 1,027 3,053 2,964
UScellular | Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 767 755 2,272 2,233
UScellular | Transferred over time | Retail service        
Disaggregation of revenue        
Revenue from contracts with customers 699 674 2,069 2,004
UScellular | Transferred over time | Retail service | Out-of-period adjustment        
Disaggregation of revenue        
Revenue from contracts with customers 9   9  
UScellular | Transferred over time | Inbound roaming        
Disaggregation of revenue        
Revenue from contracts with customers 30 42 86 119
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 38 39 117 110
UScellular | Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers 228 252 720 674
TDS Telecom        
Disaggregation of revenue        
Revenue from contracts with customers 251 246 750 726
Operating lease income 1 1 2 2
Total operating revenues 252 247 752 728
TDS Telecom | Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 251 246 749 725
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 162 152 479 441
TDS Telecom | Transferred over time | Commercial        
Disaggregation of revenue        
Revenue from contracts with customers 45 48 138 146
TDS Telecom | Transferred over time | Wholesale        
Disaggregation of revenue        
Revenue from contracts with customers 43 45 132 137
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 54 44 133 137
Operating lease income 6 6 19 20
Total operating revenues 60 50 152 157
Corporate, Eliminations and Other | Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 19 18 53 51
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 53 51
Corporate, Eliminations and Other | Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers $ 35 $ 26 $ 80 $ 86