Investments in Unconsolidated Entities (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Capital contributions, loans, advances and adjustments		$ 115		$ 115
Cumulative share of income		2,775		2,615
Cumulative share of distributions		(2,413)		(2,262)
Total equity method investments		477		468
Measurement alternative method investments		19		18
Investments recorded using the net asset value practical expedient		9		9
Total investments in unconsolidated entities		505		495		$ 479
Assets
Current		1,660		2,028
Assets		13,921	[1]	14,550	[1]	13,493
Liabilities and Equity
Current liabilities		1,184		1,514
Partners’ capital and shareholders’ equity		5,996		6,603		6,734	$ 5,593
Total liabilities and equity	[1]	13,921		14,550
Results of Operations
Revenues		5,160		5,413		5,329
Operating expenses		5,574		5,291		5,068
Operating income		(414)		122		261
Net income (loss)		(487)		72		188
Equity Method Investments [Member]
Assets
Current		1,038		1,106
Noncurrent		6,440		6,486
Assets		7,478		7,592
Liabilities and Equity
Current liabilities		765		767
Noncurrent liabilities		1,156		1,249
Partners’ capital and shareholders’ equity		5,557		5,576
Total liabilities and equity		7,478		7,592
Results of Operations
Revenues		7,304		7,303		7,127
Operating expenses		5,704		5,684		5,152
Operating income		1,600		1,619		1,975
Other income (expense), net		(30)		(19)		14
Net income (loss)		$ 1,570		$ 1,600		$ 1,989

[1] The consolidated total assets as of December 31, 2023 and 2022, include assets held by consolidated variable interest entities (VIEs) of $1,188 million and $1,236 million, respectively, which are not available to be used to settle the obligations of TDS. The consolidated total liabilities as of December 31, 2023 and 2022, include certain liabilities of consolidated VIEs of $23 million for which the creditors of the VIEs have no recourse to the general credit of TDS. See Note 15 — Variable Interest Entities for additional information.