Debt - Long-Term Debt (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Long-term debt
Principal amount	$ 3,822	$ 3,001
Unamortized discount and debt issuance costs	72	67
Total long term debt	3,750	2,934
Current portion of long-term debt	19	6
Long-term debt, net	3,731	2,928
Long-term debt maturities
Scheduled principal payments 2023	19
Scheduled principal payments 2024	26
Scheduled principal payments 2025	26
Scheduled principal payments 2026	275
Scheduled principal payments 2027	$ 218
Consolidated interest coverage ratio	3.00
Consolidated leverage ratio	3.75
6.7% Senior Notes \| UScellular
Long-term debt
Interest rate on debt	6.70%
Principal amount	$ 544	544
Long-term debt	533	532
Unamortized discount and debt issuance costs	$ 11	12
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	$ 796	299
Long-term debt	790	296
Unamortized discount and debt issuance costs	6	3
TDS Term Loan Agreements
Long-term debt
Principal amount	497	200
Long-term debt	493	198
Unamortized discount and debt issuance costs	4	2
Receivables securitization agreement \| UScellular
Long-term debt
Principal amount	275	450
Long-term debt	275	450
Unamortized discount and debt issuance costs	0	0
TDS export credit financing agreement
Long-term debt
Principal amount	50	0
Long-term debt	50	0
Unamortized discount and debt issuance costs	0	0
UScellular export credit financing agreement \| UScellular
Long-term debt
Principal amount	150	0
Long-term debt	149	0
Unamortized discount and debt issuance costs	1	0
Finance lease obligations
Long-term debt
Principal amount	7	7
Long-term debt	7	7
Unamortized discount and debt issuance costs	0	0
Other long-term notes
Long-term debt
Principal amount	3	1
Long-term debt	3	1
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
Senior Notes
Long-term debt
Unamortized debt issuance costs		$ 57
Redemption price, percentage		100.00%
Senior Notes \| UScellular
Long-term debt
Amount redeemed		$ 917
Senior Notes \| TDS
Long-term debt
Amount redeemed		$ 836

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