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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings per share
Net income attributable to U.S. Cellular shareholders	$ 160,064us-gaap_NetIncomeLoss	$ 19,482us-gaap_NetIncomeLoss
Weighted average number of shares used in basic earnings per share
Weighted average number of shares used in basic earnings per share	84,042us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	84,213us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effects of dilutive securities:
Stock options	157us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants	203us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Restricted stock units	639us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares	649us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares
Weighted average number of shares used in diluted earnings per share	84,838us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	85,065us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per share, Other disclosures
Basic earnings per share attributable to U.S. Cellular shareholders	$ 1.90us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic
Diluted earnings per share attributable to U.S. Cellular shareholders	$ 1.89us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted
Stock Options
Earnings per share, Other disclosures
Antidilutive securities	2,360us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember	1,276us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember

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