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v3.19.3.a.u2

Leases - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Leases |  |  |
Cumulative effect of accounting changes | $ 2 | $ 195 |
Rent expense, cancellable long-term operating lease | 189 | 183 |
Rent expense, cancellable short-term operating lease | 12 | 12 |
Retained earnings |  |  |
Leases |  |  |
Cumulative effect of accounting changes | $ 2 | $ 165 |
Minimum | ASC 842 | Retained earnings |  |  |
Leases |  |  |
Cumulative effect of accounting changes |  |  | $ 0

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- Definition [Line Items] for Leases [Table] + References No definition available. + Details
Name: | tds_LeasesLineItems
Namespace Prefix: | tds_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the short term portion of payments that the lessee is not obligated or required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes. + References No definition available. + Details
Name: | tds_OperatingLeasesRentExpenseCancellableShortTermLeases
Namespace Prefix: | tds_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents the long term portion of payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes. + References No definition available. + Details
Name: | tds_OperatingLeasesRentExpenseNoncancellableLongTermLeases
Namespace Prefix: | tds_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_RetainedEarningsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |