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Revenue Recognition - Disaggregation Of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 5,076 | $ 5,019
Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 3,959 | 3,909
Transferred over time | Retail service |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,650 | 2,623
Transferred over time | Inbound roaming |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 174 | 154
Transferred over time | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 533 | 509
Transferred over time | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 209 | 226
Transferred over time | Wholesale |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 185 | 191
Transferred over time | Other service |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 208 | 206
Transferred at point in time | Equipment and product sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,117 | 1,110
U.S. Cellular |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 3,948 | 3,901
U.S. Cellular | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,961 | 2,912
U.S. Cellular | Transferred over time | Retail service |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,650 | 2,623
U.S. Cellular | Transferred over time | Inbound roaming |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 174 | 154
U.S. Cellular | Transferred over time | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
U.S. Cellular | Transferred over time | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
U.S. Cellular | Transferred over time | Wholesale |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
U.S. Cellular | Transferred over time | Other service |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 137 | 135
U.S. Cellular | Transferred at point in time | Equipment and product sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 987 | 989
TDS Telecom |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 927 | 927
TDS Telecom | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 926 | 925
TDS Telecom | Transferred over time | Retail service |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
TDS Telecom | Transferred over time | Inbound roaming |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
TDS Telecom | Transferred over time | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 533 | 509
TDS Telecom | Transferred over time | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 209 | 226
TDS Telecom | Transferred over time | Wholesale |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 185 | 191
TDS Telecom | Transferred over time | Other service |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | (1) | (1)
TDS Telecom | Transferred at point in time | Equipment and product sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1 | 2
TDS Telecom Wireline |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 682 | 698
TDS Telecom Wireline | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 681 | 696
TDS Telecom Wireline | Transferred over time | Retail service |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
TDS Telecom Wireline | Transferred over time | Inbound roaming |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
TDS Telecom Wireline | Transferred over time | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 328 | 321
TDS Telecom Wireline | Transferred over time | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 168 | 184
TDS Telecom Wireline | Transferred over time | Wholesale |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 185 | 191
TDS Telecom Wireline | Transferred over time | Other service |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
TDS Telecom Wireline | Transferred at point in time | Equipment and product sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1 | 2
TDS Telecom Cable |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 246 | 230
TDS Telecom Cable | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 246 | 230
TDS Telecom Cable | Transferred over time | Retail service |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
TDS Telecom Cable | Transferred over time | Inbound roaming |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
TDS Telecom Cable | Transferred over time | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 205 | 188
TDS Telecom Cable | Transferred over time | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 41 | 42
TDS Telecom Cable | Transferred over time | Wholesale |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
TDS Telecom Cable | Transferred over time | Other service |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
TDS Telecom Cable | Transferred at point in time | Equipment and product sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Corporate, Eliminations and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 201 | 191
Corporate, Eliminations and Other | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 72 | 72
Corporate, Eliminations and Other | Transferred over time | Retail service |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Corporate, Eliminations and Other | Transferred over time | Inbound roaming |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Corporate, Eliminations and Other | Transferred over time | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Corporate, Eliminations and Other | Transferred over time | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Corporate, Eliminations and Other | Transferred over time | Wholesale |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Corporate, Eliminations and Other | Transferred over time | Other service |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 72 | 72
Corporate, Eliminations and Other | Transferred at point in time | Equipment and product sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 129 | $ 119

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