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Investments in Unconsolidated Entities (Tables)
 9 Months Ended
Sep. 30, 2024
Equity Method Investments and Joint Ventures [Abstract]  
Equity and measurement alternative method investments TDS’ Investments in unconsolidated entities are accounted for using the equity method, measurement alternative method or net asset value practical expedient method as shown in the table below. The carrying value of measurement alternative method investments represents cost minus any impairments plus or minus any observable price changes.
September 30, 2024December 31, 2023
(Dollars in millions)  
Equity method investments$495 $477 
Measurement alternative method investments20 19 
Investments recorded using the net asset value practical expedient9 9 
Total investments in unconsolidated entities$524 $505 
The following table, which is based on unaudited information provided in part by third parties, summarizes the combined results of operations of TDS’ equity method investments.
 Three Months Ended
September 30,		Nine Months Ended
September 30,
 2024202320242023
(Dollars in millions)  
Revenues$1,884 $1,812 $5,561 $5,390 
Operating expenses1,470 1,426 4,311 4,154 
Operating income414 386 1,250 1,236 
Other income (expense), net— (13)— (21)
Net income$414 $373 $1,250 $1,215