Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Earnings per share
Net income attributable to U.S. Cellular shareholders	$ 52,685	$ 74,939	$ 115,177	$ 110,100
Weighted average number of shares used in basic earnings per share
Weighted average number of shares used in basic earnings per share	84,707	84,930	84,638	85,206
Effect of dilutive securities:
Stock options	54	166	74	167
Restricted stock units	300	301	364	366
Weighted average number of shares used in diluted earnings per share	85,061	85,397	85,076	85,739
Basic earnings per share attributable to U.S. Cellular shareholders	$ 0.62	$ 0.88	$ 1.36	$ 1.29
Diluted earnings per share attributable to U.S. Cellular shareholders	$ 0.62	$ 0.88	$ 1.35	$ 1.28
Common Shares \| Stock Options Member
Effect of dilutive securities:
Antidilutive securities	2,264	1,569	2,668	1,315
Common Shares \| Restricted Stock Member
Effect of dilutive securities:
Antidilutive securities	208	168	415	141

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