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Business Segment Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Total operating revenues $ 4,964 $ 5,160 $ 5,413
Selling, general and administrative 1,721 1,753 1,768
Expenses related to strategic alternatives review 56 13  
Income (loss) before income taxes (20) (477) 125
Depreciation, amortization and accretion (943) (915) (929)
Loss on impairment of intangible assets (137) (547) (3)
Gain (loss) on asset disposals, net (30) (27) (27)
Gain (loss) on sale of business and other exit costs, net 68 0 1
Gain (loss) on license sales and exchanges, net (3) 2 0
Equity in earnings of unconsolidated entities 164 159 159
Interest and dividend income 27 20 17
Interest expense (279) (244) (174)
Income (loss) before income taxes (20) (477) 125
Depreciation, amortization and accretion (943) (915) (929)
Loss on impairment of intangible assets (137) (547) (3)
Gain (loss) on asset disposals, net (30) (27) (27)
Gain (loss) on sale of business and other exit costs, net 68 0 1
Investments in unconsolidated entities 500 505 495
Total assets 13,682 [1] 13,921 [1] 14,550
Capital expenditures 906 1,197 1,285
All Other      
Segment Reporting Information [Line Items]      
Total operating revenues 137 230 228
Income (loss) before income taxes (118) (79) (23)
Depreciation, amortization and accretion (7) (14) (14)
Loss on impairment of intangible assets 0 0 0
Gain (loss) on asset disposals, net 0 0 (1)
Gain (loss) on sale of business and other exit costs, net 19   0
Gain (loss) on license sales and exchanges, net 0 0  
Equity in earnings of unconsolidated entities 161 158 158
Interest and dividend income 12 10 8
Interest expense 178 188 156
Income (loss) before income taxes (118) (79) (23)
Depreciation, amortization and accretion (7) (14) (14)
Loss on impairment of intangible assets 0 0 0
Gain (loss) on asset disposals, net 0 0 (1)
Gain (loss) on sale of business and other exit costs, net 19   0
Investments in unconsolidated entities 42 40 39
Total assets 322 307 375
Capital expenditures 5 9 12
UScellular Total      
Segment Reporting Information [Line Items]      
Investments in unconsolidated entities 454 461 452
Total assets 10,449 10,750 11,119
TDS Telecom | Operating segment      
Segment Reporting Information [Line Items]      
Total operating revenues 1,057 1,024 1,016
Selling, general and administrative 320 326 313
Other segment items (9) (6) (3)
Expenses related to strategic alternatives review 0 0  
Segment Adjusted EBITDA (Non-GAAP) 350 285 291
Depreciation, amortization and accretion (271) (245) (215)
Loss on impairment of intangible assets (1) (547) 0
Gain (loss) on asset disposals, net (12) (10) (7)
Gain (loss) on sale of business and other exit costs, net 49   0
Gain (loss) on license sales and exchanges, net 0 0  
Depreciation, amortization and accretion (271) (245) (215)
Loss on impairment of intangible assets (1) (547) 0
Gain (loss) on asset disposals, net (12) (10) (7)
Gain (loss) on sale of business and other exit costs, net 49   0
Investments in unconsolidated entities 4 4 4
Total assets 2,911 2,864 3,056
Capital expenditures 324 577 556
TDS Telecom | Intersegment Revenues      
Segment Reporting Information [Line Items]      
Total operating revenues 4 4 4
TDS Telecom | Operating Segments Excluding Intersegment Elimination      
Segment Reporting Information [Line Items]      
Total operating revenues 1,061 1,028 1,020
Wireless Segment | Operating segment      
Segment Reporting Information [Line Items]      
Total operating revenues 3,667 3,805 4,076
Selling, general and administrative 1,298 1,334 1,376
Other segment items 0 0 0
Expenses related to strategic alternatives review (33) (8)  
Segment Adjusted EBITDA (Non-GAAP) 719 697 677
Depreciation, amortization and accretion (620) (610) (655)
Loss on impairment of intangible assets (136) 0 (3)
Gain (loss) on asset disposals, net (17) (19) (19)
Gain (loss) on sale of business and other exit costs, net 0   1
Gain (loss) on license sales and exchanges, net (3) 2  
Depreciation, amortization and accretion (620) (610) (655)
Loss on impairment of intangible assets (136) 0 (3)
Gain (loss) on asset disposals, net (17) (19) (19)
Gain (loss) on sale of business and other exit costs, net 0   1
Capital expenditures 554 580 689
Wireless Segment | Intersegment Revenues      
Segment Reporting Information [Line Items]      
Total operating revenues 0 0 0
Wireless Segment | Operating Segments Excluding Intersegment Elimination      
Segment Reporting Information [Line Items]      
Total operating revenues 3,667 3,805 4,076
Towers Segment | Operating segment      
Segment Reporting Information [Line Items]      
Total operating revenues 103 101 93
Selling, general and administrative 32 34 32
Other segment items 0 0 0
Expenses related to strategic alternatives review (2) 0  
Segment Adjusted EBITDA (Non-GAAP) 126 121 113
Depreciation, amortization and accretion (45) (46) (45)
Loss on impairment of intangible assets 0 0 0
Gain (loss) on asset disposals, net (1) 2 0
Gain (loss) on sale of business and other exit costs, net 0   0
Gain (loss) on license sales and exchanges, net 0 0  
Depreciation, amortization and accretion (45) (46) (45)
Loss on impairment of intangible assets 0 0 0
Gain (loss) on asset disposals, net (1) 2 0
Gain (loss) on sale of business and other exit costs, net 0   0
Capital expenditures 23 31 28
Towers Segment | Intersegment Revenues      
Segment Reporting Information [Line Items]      
Total operating revenues 131 127 123
Towers Segment | Operating Segments Excluding Intersegment Elimination      
Segment Reporting Information [Line Items]      
Total operating revenues 234 228 216
Total      
Segment Reporting Information [Line Items]      
Total operating revenues 4,827 4,930 5,185
Expenses related to strategic alternatives review 35 8  
Segment Adjusted EBITDA (Non-GAAP) 1,195 1,103 1,081
Depreciation, amortization and accretion (936) (901) (915)
Loss on impairment of intangible assets (137) (547) (3)
Gain (loss) on asset disposals, net (30) (27) (26)
Gain (loss) on sale of business and other exit costs, net 49   1
Gain (loss) on license sales and exchanges, net (3) 2  
Depreciation, amortization and accretion (936) (901) (915)
Loss on impairment of intangible assets (137) (547) (3)
Gain (loss) on asset disposals, net (30) (27) (26)
Gain (loss) on sale of business and other exit costs, net 49   1
Investments in unconsolidated entities 4 4 4
Total assets 2,911 2,864 3,056
Capital expenditures 901 1,188 1,273
Total | Intersegment Revenues      
Segment Reporting Information [Line Items]      
Total operating revenues 135 131 127
Total | Operating Segments Excluding Intersegment Elimination      
Segment Reporting Information [Line Items]      
Total operating revenues 4,962 5,061 5,312
Total | Intra-company eliminations      
Segment Reporting Information [Line Items]      
Total operating revenues (135) (131) (127)
Service      
Segment Reporting Information [Line Items]      
Total operating revenues 4,110 4,169 4,240
Cost of goods and services sold 1,174 1,240 1,245
Service | TDS Telecom | Operating segment      
Segment Reporting Information [Line Items]      
Cost of goods and services sold 400 423 418
Service | Wireless Segment | Operating segment      
Segment Reporting Information [Line Items]      
Cost of goods and services sold 777 794 807
Service | Towers Segment | Operating segment      
Segment Reporting Information [Line Items]      
Cost of goods and services sold 78 73 71
Equipment and product sales      
Segment Reporting Information [Line Items]      
Total operating revenues 854 991 1,173
Cost of goods and services sold 961 1,094 1,320
Equipment and product sales | TDS Telecom | Operating segment      
Segment Reporting Information [Line Items]      
Cost of goods and services sold 1 0 1
Equipment and product sales | Wireless Segment | Operating segment      
Segment Reporting Information [Line Items]      
Cost of goods and services sold 906 988 1,216
Equipment and product sales | Towers Segment | Operating segment      
Segment Reporting Information [Line Items]      
Cost of goods and services sold $ 0 $ 0 $ 0
[1] The consolidated total assets as of December 31, 2024 and 2023, include assets held by consolidated variable interest entities (VIEs) of $983 million and $1,188 million, respectively, which are not available to be used to settle the obligations of TDS. The consolidated total liabilities as of December 31, 2024 and 2023, include certain liabilities of consolidated VIEs of $24 million and $23 million, respectively, for which the creditors of the VIEs have no recourse to the general credit of TDS. See Note 16 — Variable Interest Entities for additional information.