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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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings per share
Net loss attributable to TDS common shareholders	$ (83)	$ (17)	$ (86)	$ (46)
Noncontrolling interest adjustment	0	(1)	0	0
Net income (loss) attributable to TDS shareholders	$ (83)	$ (18)	$ (86)	$ (46)
Weighted average number of shares used in basic and diluted earnings (loss) per share:	114	113	114	113
Basic earnings (loss) per share attributable to TDS common shareholders	$ (0.73)	$ (0.16)	$ (0.75)	$ (0.41)
Diluted earnings (loss) per share attributable to TDS common shareholders	$ (0.73)	$ (0.16)	$ (0.75)	$ (0.41)
Common Shares
Earnings per share
Weighted average number of shares used in basic and diluted earnings (loss) per share:	107	106	107	106
Series A Common Shares
Earnings per share
Weighted average number of shares used in basic and diluted earnings (loss) per share:	7	7	7	7

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