Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings per share
Net income attributable to U.S. Cellular shareholders	$ 35,451	$ 62,140	$ 150,628	$ 172,240
Weighted average number of shares used in basic earnings per share
Weighted average number of shares used in basic earnings per share	84,737	84,547	84,671	84,984
Effect of dilutive securities:
Stock options	57	86	63	124
Restricted stock units	358	307	356	340
Weighted average number of shares used in diluted earnings per share	85,152	84,940	85,090	85,448
Basic earnings per share attributable to U.S. Cellular shareholders	$ 0.42	$ 0.73	$ 1.78	$ 2.03
Diluted earnings per share attributable to U.S. Cellular shareholders	$ 0.42	$ 0.73	$ 1.77	$ 2.02
Common Shares \| Stock Options Member
Effect of dilutive securities:
Antidilutive securities	2,565	1,605	2,426	1,357
Common Shares \| Restricted Stock Member
Effect of dilutive securities:
Antidilutive securities		1	283	193

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