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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Earnings per share
Net income attributable to U.S. Cellular shareholders		$ 9	$ 160
Weighted average number of shares used in basic earnings per share		84	84
Effects of dilutive securities	[1]	1	1
Weighted average number of shares used in diluted earnings per share		85	85
Basic earnings per share attributable to U.S. Cellular shareholders		$ 0.10	$ 1.90
Diluted earnings per share attributable to U.S. Cellular shareholders		$ 0.10	$ 1.89
Earnings per share, Other disclosures
Antidilutive securities		2	2
[1] Includes effects of stock options and restricted stock units.

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