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Summary of Significant Accounting Policies - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) asset_group unit reporting_unit | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Basis of presentation |  |  |
Number of wireless connections | 4,600,000 |  |
Number of broadband, video and voice connections | 1,200,000 |  |
Amortization of implementation costs | $ 18 | $ 19 | $ 17
Advertising costs | 208 | 196 | $ 203
Expenses related to strategic alternatives review | $ 13 |  |
UScellular |  |  |
Basis of presentation |  |  |
FCC Licenses, period of renewal | 12 years |  |
FCC licenses, number of accounting units | unit | 1 |  |
Agent liability | $ 50 | 53 |
TDS Telecom |  |  |
Basis of presentation |  |  |
Number of reporting units | reporting_unit | 1 |  |
Loss on impairment of goodwill | $ 547 | $ 0 |
Asset groups | asset_group | 1 |  |
UScellular |  |  |
Basis of presentation |  |  |
Asset groups | asset_group | 1 |  |
TDS Telecom | Franchise rights |  |  |
Basis of presentation |  |  |
Renewal period | 10 years |  |
Minimum |  |  |
Basis of presentation |  |  |
Amortization period | 3 years |  |
Minimum | UScellular |  |  |
Basis of presentation |  |  |
FCC Licenses, period of renewal | 10 years |  |
Minimum | Leasehold Improvements |  |  |
Basis of presentation |  |  |
Useful life | 1 year |  |
Maximum |  |  |
Basis of presentation |  |  |
Amortization period | 5 years |  |
Maximum | UScellular |  |  |
Basis of presentation |  |  |
FCC Licenses, period of renewal | 15 years |  |
Maximum | Leasehold Improvements |  |  |
Basis of presentation |  |  |
Useful life | 30 years |  |
UScellular |  |  |
Basis of presentation |  |  |
TDS ownership of UScellular | 83.00% |  |

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