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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]        
Net income (loss) attributable to UScellular shareholders $ 23 $ (12) $ 40 $ 58
Weighted average number of shares used in basic earnings (loss) per share (in shares) 85 85 85 86
Effects of dilutive securities (in shares) 1 0 1 1
Weighted average number of shares used in diluted earnings (loss) per share 86 85 86 87
Basic earnings (loss) per share attributable to UScellular shareholders $ 0.26 $ (0.15) $ 0.47 $ 0.68
Diluted earnings (loss) per share attributable to UScellular shareholders $ 0.26 $ (0.15) $ 0.47 $ 0.67