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Variable Interest Entities, Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Variable Interest Entities, Other Disclosures |  |  |
Capital contributions, loans or advances | $ 19 | $ 654 |
Investments in unconsolidated entities, maximum exposure | $ 5 |  | $ 4
Out-of-period adjustment description | During the three months ended March 31, 2018, U.S. Cellular recorded out-of-period adjustments attributable to 2016 and 2017 due to errors in the application of accounting guidance applicable to the calculation of Noncontrolling interests with redemption features related to King Street Wireless, Inc. These out-of-period adjustments had the impact of increasing Net income attributable to noncontrolling interests, net of tax, by $8 million and decreasing Net income attributable to U.S. Cellular shareholders by $8 million for the three months ended March 31, 2018. U.S. Cellular determined that these adjustments were not material to any of the periods impacted. |  |
Net income attributable to noncontrolling interests, net of tax |  |  |
Variable Interest Entities, Other Disclosures |  |  |
Out-of-period adjustment | $ 8 |  |
Net income attributable to U.S. Cellular shareholders |  |  |
Variable Interest Entities, Other Disclosures |  |  |
Out-of-period adjustment | (8) |  |
USCC EIP LLC |  |  |
Variable Interest Entities, Other Disclosures |  |  |
Capital contributions, loans or advances | $ 10 | $ 650 |

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