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
Net income (loss) attributable to TDS common shareholders used in basic earnings (loss) per share	$ (17)	$ (25)	$ (46)	$ 35
Noncontrolling interest adjustment	(1)	0	0	0
Net income (loss) attributable to TDS common shareholders used in diluted earnings (loss) per share	$ (18)	$ (25)	$ (46)	$ 35
Weighted average number of shares used in basic earnings (loss) per share:	113	114	113	114
Effects of dilutive securities (in shares)	0	0	0	1
Weighted average number of shares used in diluted earnings (loss) per share	113	114	113	115
Basic earnings (loss) per share attributable to TDS common shareholders	$ (0.16)	$ (0.22)	$ (0.41)	$ 0.31
Diluted earnings (loss) per share attributable to TDS common shareholders	$ (0.16)	$ (0.22)	$ (0.41)	$ 0.30
Common Shares
Earnings per share
Weighted average number of shares used in basic earnings (loss) per share:	106	107	106	107
Series A Common Shares
Earnings per share
Weighted average number of shares used in basic earnings (loss) per share:	7	7	7	7