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Earnings Per Share - Reconciliation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share [Abstract]        
Net income attributable to UScellular shareholders $ 21 $ 35 $ 71 $ 95
Weighted average number of shares used in basic earnings per share (in shares) 86 87 86 87
Effects of dilutive securities (in shares) 1 1 1 1
Weighted average number of shares used in diluted earnings per share (in shares) 87 88 87 88
Basic earnings per share attributable to UScellular shareholders (in dollars per share) $ 0.25 $ 0.40 $ 0.82 $ 1.10
Diluted earnings per share attributable to UScellular shareholders (in dollars per share) $ 0.25 $ 0.39 $ 0.82 $ 1.08