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Earnings Per Share - Reconciliation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Net income attributable to UScellular shareholders $ 34 $ 85 $ 128 $ 224
Weighted average number of shares used in basic earnings per share (in shares) 86 86 87 86
Effects of dilutive securities (in shares) 1 2 1 1
Weighted average number of shares used in diluted earnings per share (in shares) 87 88 88 87
Basic earnings per share attributable to UScellular shareholders (USD per share) $ 0.39 $ 0.98 $ 1.48 $ 2.60
Diluted earnings per share attributable to UScellular shareholders (in shares) $ 0.38 $ 0.97 $ 1.46 $ 2.56