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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Earnings Per Share [Abstract]        
Net income attributable to UScellular shareholders $ 17 $ 5 $ 35 $ 18
Weighted average number of shares used in basic earnings per share (in shares) 86 85 86 85
Effects of dilutive securities (in shares) 2 1 2 1
Weighted average number of shares used in diluted earnings per share 88 86 88 86
Basic earnings per share attributable to UScellular shareholders $ 0.20 $ 0.05 $ 0.41 $ 0.21
Diluted earnings per share attributable to UScellular shareholders $ 0.20 $ 0.05 $ 0.40 $ 0.20