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Debt - Term Loan Agreements (Details) - USD ($)			12 Months Ended
	Dec. 01, 2026	Mar. 01, 2026	Dec. 31, 2024	Oct. 31, 2024
TDS Term Loan 1
Long-term debt
Maximum borrowing capacity			$ 200,000,000
Amount borrowed and outstanding			194,000,000
Amount borrowed and repaid			6,000,000
Amount available for use			0
Quarterly installments			500,000
TDS Term Loan 2
Long-term debt
Maximum borrowing capacity			300,000,000
Amount borrowed and outstanding			293,000,000
Amount borrowed and repaid			7,000,000
Amount available for use			0
Quarterly installments			750,000
TDS Term Loan 2 | Subsequent Event
Long-term debt
Quarterly installments	$ 2,000,000
TDS Term Loan 3
Long-term debt
Maximum borrowing capacity			375,000,000
Amount borrowed and outstanding			298,000,000
Amount borrowed and repaid			2,000,000
Amount available for use			$ 75,000,000
Debt instrument periodic payment rate			0.25%
TDS Unsecured Term Loan Agreements
Long-term debt
Maximum borrowing capacity			$ 875,000,000
Amount borrowed and outstanding			785,000,000
Amount borrowed and repaid			15,000,000
Amount available for use			75,000,000
UScellular Term Loan 1
Long-term debt
Maximum borrowing capacity			300,000,000
Amount borrowed and outstanding			237,000,000
Amount borrowed and repaid			63,000,000	$ 40,000,000
Amount available for use			0
Quarterly installments			4,000,000
UScellular Term Loan 1 | Subsequent Event
Long-term debt
Quarterly installments		$ 8,000,000
UScellular Term Loan 2
Long-term debt
Maximum borrowing capacity			300,000,000
Amount borrowed and outstanding			290,000,000
Amount borrowed and repaid			10,000,000
Amount available for use			0
Quarterly installments			750,000
UScellular Term Loan 3
Long-term debt
Maximum borrowing capacity			200,000,000
Amount borrowed and outstanding			196,000,000
Amount borrowed and repaid			4,000,000
Amount available for use			0
Quarterly installments			500,000
UScellular Term Loan 3 | Subsequent Event
Long-term debt
Quarterly installments	$ 1,000,000
UScellular Unsecured Term Loan Agreements
Long-term debt
Maximum borrowing capacity			800,000,000
Amount borrowed and outstanding			723,000,000
Amount borrowed and repaid			77,000,000
Amount available for use			$ 0
SOFR Rate | TDS Term Loan 1
Long-term debt
Contractual spread			2.10%
SOFR Rate | TDS Term Loan 2
Long-term debt
Contractual spread			2.60%
SOFR Rate | TDS Term Loan 3
Long-term debt
Contractual spread			7.00%
SOFR Rate | UScellular Term Loan 1
Long-term debt
Contractual spread			1.60%
SOFR Rate | UScellular Term Loan 2
Long-term debt
Contractual spread			2.10%
SOFR Rate | UScellular Term Loan 3
Long-term debt
Contractual spread			2.60%

X

- Definition

Rate of the required periodic payments on the outstanding borrowings.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Amounts drawn from a line of credit, which have been repaid and can not be reborrowed.

+ References

No definition available.

+ Details

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Namespace Prefix:	tds_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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X

- Definition

Amount of the required periodic payments applied to principal.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- References

No definition available.

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X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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-Publisher FASB
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-Topic 942
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-Name Accounting Standards Codification
-Section S99
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Section S99
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-Subparagraph (SX 210.7-03(a)(16)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)
-Publisher FASB
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