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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of revenue        
Revenue from contracts with customers $ 1,362 $ 1,300 $ 3,966 $ 3,875
Operating lease income 30 28 90 82
Total operating revenues 1,392 1,328 4,056 $ 3,957
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 1,031 1,037 3,096 $ 3,074
Transferred over time | Retail service        
Disaggregation of revenue        
Revenue from contracts with customers 696 697 2,098 2,064
Transferred over time | Inbound roaming        
Disaggregation of revenue        
Revenue from contracts with customers 17 30 56 86
Transferred over time | Residential        
Disaggregation of revenue        
Revenue from contracts with customers 170 162 500 479
Transferred over time | Commercial        
Disaggregation of revenue        
Revenue from contracts with customers 43 45 130 138
Transferred over time | Wholesale        
Disaggregation of revenue        
Revenue from contracts with customers 42 43 129 132
Transferred over time | Other service        
Disaggregation of revenue        
Revenue from contracts with customers 63 59 183 175
Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers 331 263 870 801
UScellular        
Disaggregation of revenue        
Revenue from contracts with customers 1,060 995 3,052 2,992
Operating lease income 23 21 68 61
Total operating revenues 1,083 1,016 3,120 3,053
UScellular | Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 758 767 2,283 2,272
UScellular | Transferred over time | Retail service        
Disaggregation of revenue        
Revenue from contracts with customers 696 697 2,098 2,064
UScellular | Transferred over time | Retail service | Prior period reclassification        
Disaggregation of revenue        
Revenue from contracts with customers   (2)   (5)
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 17 30 56 86
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 45 40 129 122
UScellular | Transferred over time | Other service | Prior period reclassification        
Disaggregation of revenue        
Revenue from contracts with customers   2   5
UScellular | Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers 302 228 769 720
TDS Telecom        
Disaggregation of revenue        
Revenue from contracts with customers 255 251 761 750
Operating lease income 1 1 3 2
Total operating revenues 256 252 763 752
TDS Telecom | Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 255 251 760 749
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 170 162 500 479
TDS Telecom | Transferred over time | Commercial        
Disaggregation of revenue        
Revenue from contracts with customers 43 45 130 138
TDS Telecom | Transferred over time | Wholesale        
Disaggregation of revenue        
Revenue from contracts with customers 42 43 129 132
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 47 54 154 133
Operating lease income 6 6 19 19
Total operating revenues 53 60 173 152
Corporate, Eliminations and Other | Transferred over time        
Disaggregation of revenue        
Revenue from contracts with customers 18 19 54 53
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 19 54 53
Corporate, Eliminations and Other | Transferred at point in time | Equipment and product sales        
Disaggregation of revenue        
Revenue from contracts with customers $ 29 $ 35 $ 100 $ 80