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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings per share
Net income attributable to U.S. Cellular shareholders	$ 12	$ 27	$ 38	$ 36
Weighted average number of shares used in basic earnings per share	85	85	85	85
Effects of dilutive securities	1		1
Weighted average number of shares used in diluted earnings per share	86	85	86	85
Basic earnings per share attributable to U.S. Cellular shareholders	$ 0.14	$ 0.32	$ 0.45	$ 0.43
Diluted earnings per share attributable to U.S. Cellular shareholders	$ 0.14	$ 0.32	$ 0.44	$ 0.43
Earnings per share, Other disclosures
Antidilutive securities	3	3	3	3

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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