Investments in Unconsolidated Entities (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024		Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Equity method investments:
Capital contributions, loans, advances and adjustments		$ 104		$ 104
Cumulative share of income		2,890		2,729
Cumulative share of distributions		(2,554)		(2,385)
Total equity method investments		440		448
Measurement alternative method investments		5		4
Investments recorded using the net asset value practical expedient		9		9
Total investments in unconsolidated entities		454		461		$ 452
Assets
Current		1,345		1,400
Total assets		10,449	[1]	10,750	[1]	11,119
Liabilities and Equity
Current liabilities		884		901
Partners’ capital and shareholders’ equity		4,592		4,642		4,570	$ 4,563
Total liabilities and equity	[1]	10,449		10,750
Results of Operations
Revenues		3,770		3,906		4,169
Operating expenses		3,782		3,767		4,100
Operating income		(12)		139		69
Net income		(32)		58		35
Equity Method Investments
Assets
Current		1,230		1,003
Noncurrent		6,514		6,383
Total assets		7,744		7,386
Liabilities and Equity
Current liabilities		856		762
Noncurrent liabilities		1,628		1,148
Partners’ capital and shareholders’ equity		5,260		5,476
Total liabilities and equity		7,744		7,386
Results of Operations
Revenues		7,546		7,277		7,275
Operating expenses		5,926		5,683		5,662
Operating income		1,620		1,594		1,613
Other income (expense), net		(3)		(28)		(16)
Net income		$ 1,617		$ 1,566		$ 1,597

[1] The consolidated total assets as of December 31, 2024 and 2023, include assets held by consolidated variable interest entities (VIEs) of $1,011 million and $1,217 million, respectively, which are not available to be used to settle the obligations of UScellular. The consolidated total liabilities as of December 31, 2024 and 2023, include certain liabilities of consolidated VIEs of $27 million and $26 million, respectively, for which the creditors of the VIEs have no recourse to the general credit of UScellular. See Note 15 — Variable Interest Entities for additional information.