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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings per share
Net income attributable to U.S. Cellular shareholders	$ 12	$ 48	$ 241
Weighted average number of shares used in basic earnings per share	85	85	84
Effects of dilutive securities	1		1
Weighted average number of shares used in diluted earnings per share	86	85	85
Basic earnings per share attributable to U.S. Cellular shareholders	$ 0.14	$ 0.56	$ 2.86
Diluted earnings per share attributable to U.S. Cellular shareholders	$ 0.14	$ 0.56	$ 2.84

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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