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Earnings Per Share - Computation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings per share      
Net income (loss) attributable to TDS common shareholders used in basic earnings (loss) per share $ (97) $ (569) $ (7)
Noncontrolling interest adjustment 0 (1) (1)
Net income (loss) attributable to TDS common shareholders used in diluted earnings (loss) per share $ (97) $ (570) $ (8)
Weighted average number of shares used in basic earnings (loss) per share (in shares) 114 113 114
Weighted average number of shares used in diluted earnings (loss) per share (in shares) 114 113 114
Basic earnings (loss) per share attributable to TDS common shareholders $ (0.85) $ (5.05) $ (0.07)
Diluted earnings (loss) per share attributable to TDS common shareholders $ (0.85) $ (5.06) $ (0.07)
Common Shares      
Earnings per share      
Weighted average number of shares used in basic earnings (loss) per share (in shares) 107 106 107
Series A Common Shares      
Earnings per share      
Weighted average number of shares used in basic earnings (loss) per share (in shares) 7 7 7