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Commitments and Contingencies, Minimum lease obligations (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Operating leases description U.S. Cellular and its subsidiaries have leases for office space, retail store sites, cell sites and equipment which are accounted for as operating leases. Certain leases have renewal options and/or fixed rental increases. Renewal options that are reasonably assured of exercise are included in determining the lease term. Any rent abatements or lease incentives, in addition to fixed rental increases, are included in the calculation of rent expense and calculated on a straight-line basis over the defined lease term. Rent expense totaled $166 million, $161 million and $153 million in 2017, 2016 and 2015, respectively.
Operating Leases Future Minimum Payments Due  
2018 $ 145
2019 133
2020 120
2021 107
2022 92
Thereafter 737
Total 1,334
Operating Leases Future Minimum Receipts  
2018 54
2019 45
2020 34
2021 21
2022 9
Thereafter 2
Total $ 165