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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share [Abstract]        
Net income (loss) attributable to UScellular shareholders $ (12) $ 34 $ 58 $ 128
Weighted average number of shares used in basic earnings (loss) per share (in shares) 85 86 86 87
Effects of dilutive securities (in shares) 0 1 1 1
Weighted average number of shares used in diluted earnings (loss) per share 85 87 87 88
Basic earnings (loss) per share attributable to UScellular shareholders $ (0.15) $ 0.39 $ 0.68 $ 1.48
Diluted earnings (loss) per share attributable to UScellular shareholders $ (0.15) $ 0.38 $ 0.67 $ 1.46