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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% |

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- Definition Rate of the required periodic payments on the outstanding borrowings. + References No definition available. + Details
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- 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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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- 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 + Details
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- 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 -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -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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- 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 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- 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 -URI https://asc.fasb.org/1943274/2147481544/470-10-50-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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