XML 69 R37.htm IDEA: XBRL DOCUMENT
v3.20.2

Revenue Recognition - Contract Cost Assets (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Contract Cost Assets |  |
Contract cost assets | $ 148 | $ 157
Sales commissions |  |
Contract Cost Assets |  |
Contract cost assets | 137 | 146
Installation costs |  |
Contract Cost Assets |  |
Contract cost assets | $ 11 | $ 11

X
- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
Name: | us-gaap_CapitalizedContractCostNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CapitalizedContractCostNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CapitalizedContractCostAxis=tds_SalesCommissionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedContractCostAxis=tds_InstallationCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |