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Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Change Due to Net Income Attributable to Parent and Effects of Changes, Net [Abstract]
Net income attributable to TDS shareholders	$ 27	$ 65	$ 86	$ 135
Transfers (to) from noncontrolling interests
Change in TDS' Capital in excess of par value from UScellular's issuance of UScellular shares			(43)	(32)
Change in TDS' Capital in excess of par value from UScellular's repurchases of UScellular shares			1	14
Net transfers (to) from noncontrolling interests			(42)	(18)
Net income attributable to TDS shareholders after transfers (to) from noncontrolling interests			$ 44	$ 117

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Represents a sale (new stock issuance) by a subsidiary to noncontrolling interests (third parties, parties directly or indirectly unrelated to parent) during the period. The capital transaction by subsidiary does not result in a loss of control by the parent, but does effect a change in total (consolidated) equity attributable to the parent.

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The increase (decrease) during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not arise in a deconsolidation of the subsidiary from the consolidated financial statements.

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Represents the repurchase of equity (treasury stock) by a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent; but not deconsolidation by the parent.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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