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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings per share
Net income (loss) attributable to U.S. Cellular shareholders	$ (299)	$ 17	$ (261)	$ 53
Weighted average number of shares used in basic earnings (loss) per share	85	85	85	85
Effects of dilutive securities	0		0
Weighted average number of shares used in diluted earnings (loss) per share	85	85	85	85
Basic earnings (loss) per share attributable to U.S. Cellular shareholders	$ (3.51)	$ 0.20	$ (3.07)	$ 0.63
Diluted earnings (loss) per share attributable to U.S. Cellular shareholders	$ (3.51)	$ 0.20	$ (3.07)	$ 0.63

X

- 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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