Earnings Per Share - Computation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share, Basic [Abstract]
Net income attributable to UScellular shareholders	$ 30	$ 155	$ 229
Weighted average number of shares used in basic earnings per share (in shares)	85	86	86
Effects of dilutive securities (in shares)	1	1	1
Weighted average number of shares used in diluted earnings per share (in shares)	86	87	87
Basic earnings per share attributable to UScellular shareholders	$ 0.35	$ 1.80	$ 2.66
Diluted earnings per share attributable to UScellular shareholders	$ 0.35	$ 1.77	$ 2.62