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Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Cash Flow [Line Items]
Interest paid	$ 168	$ 167	$ 168
Income taxes paid, net of refunds received	40	56	(39)
Supplemental cash flows, stock based compensation
Net cash receipts from exercise of stock options and vesting of other stock awards	42	4	9
TDS Parent Company
Supplemental cash flows, stock based compensation
Cash receipts upon exercise of stock options	48	7	13
Cash disbursements for payment of taxes	(6)	(3)	(4)
Net cash receipts from exercise of stock options and vesting of other stock awards	42	4	9
U.S. Cellular
Supplemental cash flows, stock based compensation
Cash receipts upon exercise of stock options	29	5	12
Cash disbursements for payment of taxes	(11)	(4)	(6)
Net cash receipts from exercise of stock options and vesting of other stock awards	$ 18	$ 1	$ 6
Common Shares | TDS Parent Company
Supplemental cash flows, stock based compensation
Common Shares withheld	676,364	120,560	126,747
Aggregate value of Common Shares withheld	$ 21	$ 3	$ 4
U S Cellular Common Shares | U.S. Cellular
Supplemental cash flows, stock based compensation
Common Shares withheld	1,549,800	144,755	308,010
Aggregate value of Common Shares withheld	$ 73	$ 6	$ 13

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- Definition

For net-share settlement of share-based awards when the employer withholds shares for the exercise price and income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Disclosure of supplemental cash flow items.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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