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Consolidated Statement Of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ (26) $ (487) $ 72
Change related to retirement plan      
Net actuarial gains (losses) 10 8 (4)
Amortization of prior service cost and unrecognized net gain (1) 0 4
Amounts included in net periodic benefit cost for the period 9 8 0
Change in deferred income taxes (2) (2) 0
Change related to retirement plan, net of tax 7 6 0
Net change in accumulated other comprehensive income 7 6 0
Comprehensive income (loss) (19) (481) 72
Less: Net income attributable to noncontrolling interests, net of tax 2 13 10
Comprehensive income (loss) attributable to TDS shareholders $ (21) $ (494) $ 62