Revenue Recognition - Disaggregation Of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 5,293	$ 5,220	$ 5,120
Out-of-period adjustment
Disaggregation of Revenue [Line Items]
Immaterial error correction		During the third quarter of 2021, UScellular recorded a $9 million out-of-period error related to the timing of recognition of regulatory fee billings. This adjustment had the impact of increasing Service revenue by $9 million in 2021. UScellular determined that this adjustment was not material to any of the periods impacted.
Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,120	$ 4,107	4,031
Transferred over time | Retail service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,793	2,757	2,681
Transferred over time | Inbound roaming
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	67	110	152
Transferred over time | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	669	641	594
Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	173	183	194
Transferred over time | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	173	178	184
Transferred over time | Other service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	245	238	226
Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,173	1,113	1,089
UScellular
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,076	4,039	3,960
UScellular | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,032	3,032	2,990
UScellular | Transferred over time | Retail service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,793	2,757	2,681
UScellular | Transferred over time | Retail service | Prior period reclassification
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		(8)	(5)
UScellular | Transferred over time | Retail service | Out-of-period adjustment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		9
UScellular | Transferred over time | Inbound roaming
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	67	110	152
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	172	165	157
UScellular | Transferred over time | Other service | Prior period reclassification
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		8	5
UScellular | Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,044	1,007	970
TDS Telecom
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,016	1,003	973
TDS Telecom | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,015	1,002	972
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 | Inbound roaming
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	669	641	594
TDS Telecom | Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	173	183	194
TDS Telecom | Transferred over time | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	173	178	184
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	201	178	187
Corporate, Eliminations and Other | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	73	73	69
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 | Inbound roaming
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	73	73	69
Corporate, Eliminations and Other | Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 128	$ 105	$ 118