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Leases - Maturities of Expected Lease Revenues (Details) $ in Millions	Mar. 31, 2019 USD ($)
Leases [Abstract]
Remainder of 2019	$ 57
2020	70
2021	37
2022	25
2023	13
Thereafter	10
Total future lease maturities	$ 212

X

- Definition

Total expected lease revenues.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of lease revenues due in remainder of fiscal year following latest fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of lease revenues due after fifth fiscal year following latest fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of lease revenues due in fifth fiscal year following latest fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of lease revenues due in fourth fiscal year following latest fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of lease revenues due in third fiscal year following latest fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of lease revenues due in second fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration