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Revenue Recognition - Disaggregation Of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 5,220	$ 5,120	$ 5,076
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	$ 4,107	4,031	3,959
Transferred over time | Retail service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,765	2,686	2,650
Transferred over time | Inbound roaming
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	110	152	174
Transferred over time | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	641	594	533
Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	183	194	205
Transferred over time | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	178	184	188
Transferred over time | Other service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	230	221	209
Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,113	1,089	1,117
UScellular
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,039	3,960	3,948
UScellular | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,032	2,990	2,961
UScellular | Transferred over time | Retail service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,765	2,686	2,650
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	110	152	174
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	157	152	137
UScellular | Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,007	970	987
TDS Telecom
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,003	973	927
TDS Telecom | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,002	972	926
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	641	594	533
TDS Telecom | Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	183	194	205
TDS Telecom | Transferred over time | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	178	184	188
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	178	187	201
Corporate, Eliminations and Other | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	73	69	72
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	69	72
Corporate, Eliminations and Other | Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 105	$ 118	$ 129

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