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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings per share
Net income attributable to U.S. Cellular shareholders	$ 143,391	$ 52,685	$ 148,305	$ 115,177
Weighted average number of shares used in basic earnings per share
Weighted average number of shares used in basic earnings per share	83,845	84,707	83,842	84,638
Effect of dilutive securities:
Stock options	226	163	201	202
Restricted stock units	590	366	612	408
Weighted average number of shares used in diluted earnings per share	84,661	85,236	84,655	85,248
Basic earnings per share attributable to U.S. Cellular shareholders	$ 1.71	$ 0.62	$ 1.77	$ 1.36
Diluted earnings per share attributable to U.S. Cellular shareholders	$ 1.69	$ 0.62	$ 1.75	$ 1.35
Common Shares | Stock Options
Effect of dilutive securities:
Antidilutive securities	2,437	2,498	2,041	2,005
Common Shares | Restricted Stock
Effect of dilutive securities:
Antidilutive securities	208	223	221	242

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