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Revenue Recognition - Disaggregation Of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customers | $ 3,667 | $ 3,805 | $ 4,076
Out-of-period adjustment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Immaterial error correction |  | UScellular recorded an adjustment to correct a prior period error related to the recognition of discounts for certain Prepaid customers, which decreased Service revenue by $5 million in 2023. This adjustment was not material to any of the periods impacted. |
Transferred over time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customers | 2,884 | $ 2,943 | 3,032
Transferred over time | Retail service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customers | 2,674 | 2,742 | 2,793
Transferred over time | Retail service | Out-of-period adjustment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customers |  | (5) |
Transferred over time | Other service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customers | 210 | 201 | 239
Transferred at point in time | Equipment sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customers | $ 783 | $ 862 | $ 1,044

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