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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of revenue
Revenue from contracts with customers	$ 1,157	$ 1,206	$ 2,284	$ 2,436
Operating lease income	29	32	57	64
Total operating revenues	1,186	1,238	2,341	2,500
Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	971	1,002	1,940	2,014
Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	652	666	1,312	1,344
Transferred over time | Residential
Disaggregation of revenue
Revenue from contracts with customers	183	186	367	372
Transferred over time | Commercial
Disaggregation of revenue
Revenue from contracts with customers	35	37	69	74
Transferred over time | Wholesale
Disaggregation of revenue
Revenue from contracts with customers	46	43	84	86
Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	55	70	108	138
Transferred at point in time | Equipment and product sales
Disaggregation of revenue
Revenue from contracts with customers	186	204	344	422
Array Total
Disaggregation of revenue
Revenue from contracts with customers	888	902	1,751	1,826
Operating lease income	28	25	56	51
Total operating revenues	916	927	1,807	1,877
Array Total | Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	708	718	1,421	1,446
Array Total | Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	652	666	1,312	1,344
Array Total | Transferred over time | Residential
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
Array Total | Transferred over time | Commercial
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
Array Total | Transferred over time | Wholesale
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
Array Total | Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	56	52	109	102
Array Total | Transferred at point in time | Equipment and product sales
Disaggregation of revenue
Revenue from contracts with customers	180	184	330	380
TDS Telecom
Disaggregation of revenue
Revenue from contracts with customers	264	266	521	532
Operating lease income	1	1	1	2
Total operating revenues	265	267	522	534
TDS Telecom | Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	264	266	520	532
TDS Telecom | Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
TDS Telecom | Transferred over time | Residential
Disaggregation of revenue
Revenue from contracts with customers	183	186	367	372
TDS Telecom | Transferred over time | Commercial
Disaggregation of revenue
Revenue from contracts with customers	35	37	69	74
TDS Telecom | Transferred over time | Wholesale
Disaggregation of revenue
Revenue from contracts with customers	46	43	84	86
TDS Telecom | Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
TDS Telecom | Transferred at point in time | Equipment and product sales
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
Corporate, Eliminations and Other
Disaggregation of revenue
Revenue from contracts with customers	5	38	13	78
Operating lease income	0	6	0	11
Total operating revenues	5	44	13	89
Corporate, Eliminations and Other | Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	(1)	18	(1)	36
Corporate, Eliminations and Other | Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
Corporate, Eliminations and Other | Transferred over time | Residential
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
Corporate, Eliminations and Other | Transferred over time | Commercial
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
Corporate, Eliminations and Other | Transferred over time | Wholesale
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
Corporate, Eliminations and Other | Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	(1)	18	(1)	36
Corporate, Eliminations and Other | Transferred at point in time | Equipment and product sales
Disaggregation of revenue
Revenue from contracts with customers	$ 6	$ 20	$ 14	$ 42

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