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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of revenue |  |  |  |
Revenue from contracts with customers | $ 995 | $ 1,007 | $ 2,992 | $ 2,907
Operating lease income | 21 | 20 | 61 | 57
Total operating revenues | 1,016 | 1,027 | $ 3,053 | 2,964
Out-of-period adjustment |  |  |  |
Disaggregation of revenue |  |  |  |
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 | 767 | 755 | $ 2,272 | 2,233
Transferred over time | Retail service1 |  |  |  |
Disaggregation of revenue |  |  |  |
Revenue from contracts with customers | 699 | 674 | 2,069 | 2,004
Transferred over time | Retail service1 | Out-of-period adjustment |  |  |  |
Disaggregation of revenue |  |  |  |
Revenue from contracts with customers | 9 |  | 9 |
Transferred over time | Inbound roaming |  |  |  |
Disaggregation of revenue |  |  |  |
Revenue from contracts with customers | 30 | 42 | 86 | 119
Transferred over time | Other service |  |  |  |
Disaggregation of revenue |  |  |  |
Revenue from contracts with customers | 38 | 39 | 117 | 110
Transferred at point in time | Equipment sales |  |  |  |
Disaggregation of revenue |  |  |  |
Revenue from contracts with customers | $ 228 | $ 252 | $ 720 | $ 674

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