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Revenue Recognition - Disaggregation Of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | $ 4,039 | $ 3,960 | $ 3,948
Out-of-period adjustment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Immaterial error correction | During the third quarter of 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 in 2021. UScellular determined that this adjustment was not material to any of the periods impacted. |  |
Transferred over time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | $ 3,032 | 2,990 | 2,961
Transferred over time | Retail Service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 2,765 | 2,686 | 2,650
Transferred over time | Retail Service | Out-of-period adjustment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 9 |  |
Transferred over time | Inbound roaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 110 | 152 | 174
Transferred over time | Other service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 157 | 152 | 137
Transferred at point in time | Equipment sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | $ 1,007 | $ 970 | $ 987

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