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Noncontrolling Interests (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Change Due to Net Income Attributable to Parent and Effects of Changes, Net [Abstract]        
Net income attributable to TDS shareholders $ 12 $ 3 $ 19 $ 32
Transfers (to) from noncontrolling interests        
Change in TDS' Capital in excess of par value from Array's issuance of Array shares     (75) (42)
Change in TDS' Capital in excess of par value from Array's repurchases of Array shares     (3) 0
Net transfers (to) from noncontrolling interests     (78) (42)
Net income (loss) attributable to TDS shareholders after transfers (to) from noncontrolling interests     $ (59) $ (10)