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The minimum interest coverage ratio required according to the terms for borrowing under this debt instrument.

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The maximum leverage ratio required according to the terms for borrowing under this debt instrument.

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Refinancing Indebtedness

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, classified as current.

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Debt - Long-Term Debt (Details) $ in Millions	12 Months Ended
Debt - Long-Term Debt (Details) $ in Millions	Dec. 31, 2024 USD ($)	Apr. 01, 2025	Apr. 01, 2024	Mar. 31, 2024	Dec. 31, 2023 USD ($)
Long-term debt
Principal amount	$ 4,164				$ 4,179
Unamortized discount and debt issuance costs	82				73
Total long term debt	4,082				4,106
Current portion of long-term debt	31				26
Long-term debt, net	4,051				4,080
Long-term debt maturities
Scheduled principal payments 2025	31
Scheduled principal payments 2026	539
Scheduled principal payments 2027	322
Scheduled principal payments 2028	485
Scheduled principal payments 2029	$ 299
Consolidated leverage ratio			4.00	4.25
Consolidated interest coverage ratio	3.00
TDS Term Loan 3
Long-term debt maturities
Consolidated leverage ratio			4.50
Subsequent Event
Long-term debt maturities
Consolidated leverage ratio		3.75
Subsequent Event \| TDS Term Loan 3
Long-term debt maturities
Consolidated leverage ratio		4.25
6.7% Senior Notes \| UScellular
Long-term debt
Interest rate on debt	6.70%
Principal amount	$ 544				544
Long-term debt	534				533
Unamortized discount and debt issuance costs	$ 10				11
Redemption price, percentage	100.00%
6.7% Senior Notes \| Treasury Rate \| UScellular
Long-term debt
Interest rate on debt	0.30%
6.25% Senior Notes \| UScellular
Long-term debt
Interest rate on debt	6.25%
Principal amount	$ 500				500
Long-term debt	483				483
Unamortized discount and debt issuance costs	$ 17				17
5.5% Senior Notes \| UScellular
Long-term debt
Interest rate on debt	5.50%
Principal amount	$ 500				500
Long-term debt	483				483
Unamortized discount and debt issuance costs	$ 17				17
5.5% Senior Notes \| UScellular
Long-term debt
Interest rate on debt	5.50%
Principal amount	$ 500				500
Long-term debt	484				484
Unamortized discount and debt issuance costs	$ 16				16
Callable Notes
Long-term debt
Redemption price, percentage	100.00%
UScellular Unsecured Term Loan Agreements \| UScellular
Long-term debt
Principal amount	$ 723				783
Long-term debt	719				779
Unamortized discount and debt issuance costs	4				4
TDS Unsecured Term Loan Agreements
Long-term debt
Principal amount	785				492
Long-term debt	769				488
Unamortized discount and debt issuance costs	16				4
TDS Secured Term Loan
Long-term debt
Principal amount	300				300
Long-term debt	298				297
Unamortized discount and debt issuance costs	2				3
Receivables securitization agreement \| UScellular
Long-term debt
Principal amount	2				150
Long-term debt	2				150
Unamortized discount and debt issuance costs	0				0
TDS export credit financing agreement
Long-term debt
Principal amount	150				150
Long-term debt	150				150
Unamortized discount and debt issuance costs	0				0
UScellular export credit financing agreement \| UScellular
Long-term debt
Principal amount	150				150
Long-term debt	150				149
Unamortized discount and debt issuance costs	0				1
TDS Revolving Credit Agreement
Long-term debt
Principal amount	0				100
Long-term debt	0				100
Unamortized discount and debt issuance costs	0				0
Finance lease obligations
Long-term debt
Principal amount	7				6
Long-term debt	7				6
Unamortized discount and debt issuance costs	0				0
Other long-term notes
Long-term debt
Principal amount	3				4
Long-term debt	3				4
Unamortized discount and debt issuance costs	0				$ 0
Subordination Agreement \| UScellular
Long-term debt maturities
Consolidated funded indebtedness	0
Refinancing indebtedness	0
Subordination Agreement \| UScellular \| Maximum
Long-term debt maturities
Consolidated funded indebtedness	105
Refinancing indebtedness	$ 250