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Revenue Recognition - Disaggregation Of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 4,843	$ 5,033	$ 5,293
Out-of-period adjustment
Disaggregation of Revenue [Line Items]
Immaterial error correction		UScellular recorded an adjustment to correct a prior period error related to the recognition of discounts for certain Prepaid customers, which decreased Service revenue by $5 million in 2023. This adjustment was not material to any of the periods impacted.
Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,989	$ 4,042	4,120
Transferred over time | Retail service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,674	2,742	2,793
Transferred over time | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	740	700	669
Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	148	155	173
Transferred over time | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	169	169	173
Transferred over time | Other service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	258	276	312
Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	854	991	1,173
UScellular
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,667	3,805	4,076
UScellular | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,884	2,943	3,032
UScellular | Transferred over time | Retail service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,674	2,742	2,793
UScellular | Transferred over time | Retail service | Out-of-period adjustment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		(5)
UScellular | Transferred over time | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
UScellular | Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
UScellular | Transferred over time | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
UScellular | Transferred over time | Other service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	210	201	239
UScellular | Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	783	862	1,044
TDS Telecom
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,058	1,025	1,016
TDS Telecom | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,057	1,024	1,015
TDS Telecom | Transferred over time | Retail service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
TDS Telecom | Transferred over time | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	740	700	669
TDS Telecom | Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	148	155	173
TDS Telecom | Transferred over time | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	169	169	173
TDS Telecom | Transferred over time | Other service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
TDS Telecom | Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	1	1
Corporate, Eliminations and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	118	203	201
Corporate, Eliminations and Other | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	48	75	73
Corporate, Eliminations and Other | Transferred over time | Retail service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Corporate, Eliminations and Other | Transferred over time | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Corporate, Eliminations and Other | Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Corporate, Eliminations and Other | Transferred over time | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Corporate, Eliminations and Other | Transferred over time | Other service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	48	75	73
Corporate, Eliminations and Other | Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 70	$ 128	$ 128

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