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

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Refinancing Indebtedness

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

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Amount of unamortized debt discount (premium) and debt issuance costs.

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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 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 fourth 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, 2023 USD ($)	Apr. 01, 2025	Apr. 01, 2024	Dec. 31, 2022 USD ($)
Long-term debt
Principal amount	$ 4,179			$ 3,822
Unamortized discount and debt issuance costs	73			72
Total long term debt	4,106			3,750
Current portion of long-term debt	26			19
Long-term debt, net	4,080			3,731
Long-term debt maturities
Scheduled principal payments 2024	26
Scheduled principal payments 2025	26
Scheduled principal payments 2026	676
Scheduled principal payments 2027	319
Scheduled principal payments 2028	$ 482
Consolidated leverage ratio	4.25
Consolidated interest coverage ratio	3.00
Subsequent Event
Long-term debt maturities
Consolidated leverage ratio		3.75	4.00
6.7% Senior Notes \| UScellular
Long-term debt
Interest rate on debt	6.70%
Principal amount	$ 544			544
Long-term debt	533			533
Unamortized discount and debt issuance costs	$ 11			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 Term Loan Agreements \| UScellular
Long-term debt
Principal amount	$ 783			796
Long-term debt	779			790
Unamortized discount and debt issuance costs	4			6
TDS Term Loan Agreements
Long-term debt
Principal amount	492			497
Long-term debt	488			493
Unamortized discount and debt issuance costs	4			4
TDS secured term loan
Long-term debt
Principal amount	300			0
Long-term debt	297			0
Unamortized discount and debt issuance costs	3			0
Receivables securitization agreement \| UScellular
Long-term debt
Principal amount	150			275
Long-term debt	150			275
Unamortized discount and debt issuance costs	0			0
TDS export credit financing agreement
Long-term debt
Principal amount	150			50
Long-term debt	150			50
Unamortized discount and debt issuance costs	0			0
UScellular export credit financing agreement \| UScellular
Long-term debt
Principal amount	150			150
Long-term debt	149			149
Unamortized discount and debt issuance costs	1			1
TDS Revolving Credit Agreement
Long-term debt
Principal amount	100			0
Long-term debt	100			0
Unamortized discount and debt issuance costs	0			0
Finance lease obligations
Long-term debt
Principal amount	6			7
Long-term debt	6			7
Unamortized discount and debt issuance costs	0			0
Other long-term notes
Long-term debt
Principal amount	4			3
Long-term debt	4			3
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