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Debt - Revolving Credit Agreements (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 04, 2022 USD ($) | Jan. 04, 2022 USD ($) | Dec. 31, 2021 USD ($)
TDS Revolving Credit Agreement |  |  |
Revolving credit |  |  |
Maximum borrowing capacity |  |  | $ 400,000,000
Letters of credit outstanding |  |  | 1,000,000
Amounts borrowed |  |  | 0
Amount available for use |  |  | $ 399,000,000
TDS Revolving Credit Agreement | LIBOR rate |  |  |
Revolving credit |  |  |
Contractual spread |  |  | 1.50%
UScellular Revolving Credit Agreement |  |  |
Revolving credit |  |  |
Maximum borrowing capacity |  |  | $ 300,000,000
Letters of credit outstanding |  |  | 0
Amounts borrowed |  |  | 0
Amount available for use |  |  | $ 300,000,000
UScellular Revolving Credit Agreement | Subsequent Event |  |  |
Revolving credit |  |  |
Amounts repaid | $ 75,000,000 |  |
Amount borrowed |  | $ 75,000,000 |
UScellular Revolving Credit Agreement | SOFR Rate |  |  |
Revolving credit |  |  |
Contractual spread |  |  | 1.60%
TDS and UScellular Revolving Credit Agreements |  |  |
Revolving credit |  |  |
Consolidated interest coverage ratio |  |  | 3.00
Consolidated leverage ratio |  |  | 3.75
Subordination Agreement | UScellular Revolving Credit Agreement |  |  |
Revolving credit |  |  |
Consolidated funded indebtedness |  |  | $ 0
Refinancing indebtedness |  |  | 0
Subordination Agreement | UScellular Revolving Credit Agreement | Maximum |  |  |
Revolving credit |  |  |
Consolidated funded indebtedness |  |  | 105,000,000
Refinancing indebtedness |  |  | $ 250,000,000

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- Definition Consolidated Funded Indebtedness + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The minimum interest coverage ratio required according to the terms for borrowing under this debt instrument. + References No definition available. + Details
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- Definition The maximum leverage ratio required according to the terms for borrowing under this debt instrument. + References No definition available. + Details
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- Definition Refinancing Indebtedness + References No definition available. + Details
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Namespace Prefix: | tds_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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