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Earnings Per Share - Reconciliation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Net income attributable to UScellular shareholders $ 60 $ 71
Weighted average number of shares used in basic earnings per share (in shares) 86 86
Effects of dilutive securities (in shares) 2 2
Weighted average number of shares used in diluted earnings per share (in shares) 88 88
Basic earnings per share attributable to UScellular shareholders (USD per share) $ 0.70 $ 0.82
Diluted earnings per share attributable to UScellular shareholders (in shares) $ 0.69 $ 0.81