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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of revenue
Revenue from contracts with customers	$ 1,272	$ 1,286
Operating lease income	31	29
Total operating revenues	1,303	1,315
Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	1,012	1,033
Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	691	702
Transferred over time | Inbound roaming
Disaggregation of revenue
Revenue from contracts with customers	9	21
Transferred over time | Residential
Disaggregation of revenue
Revenue from contracts with customers	169	163
Transferred over time | Commercial
Disaggregation of revenue
Revenue from contracts with customers	41	44
Transferred over time | Wholesale
Disaggregation of revenue
Revenue from contracts with customers	42	44
Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	60	59
Transferred at point in time | Equipment and product sales
Disaggregation of revenue
Revenue from contracts with customers	260	253
UScellular
Disaggregation of revenue
Revenue from contracts with customers	961	988
Operating lease income	25	22
Total operating revenues	986	1,010
UScellular | Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	742	765
UScellular | Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	691	702
UScellular | Transferred over time | Inbound roaming
Disaggregation of revenue
Revenue from contracts with customers	9	21
UScellular | Transferred over time | Residential
Disaggregation of revenue
Revenue from contracts with customers	0	0
UScellular | Transferred over time | Commercial
Disaggregation of revenue
Revenue from contracts with customers	0	0
UScellular | Transferred over time | Wholesale
Disaggregation of revenue
Revenue from contracts with customers	0	0
UScellular | Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	42	42
UScellular | Transferred at point in time | Equipment and product sales
Disaggregation of revenue
Revenue from contracts with customers	219	223
TDS Telecom
Disaggregation of revenue
Revenue from contracts with customers	252	251
Operating lease income	1	1
Total operating revenues	253	251
TDS Telecom | Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	252	250
TDS Telecom | Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	0	0
TDS Telecom | Transferred over time | Inbound roaming
Disaggregation of revenue
Revenue from contracts with customers	0	0
TDS Telecom | Transferred over time | Residential
Disaggregation of revenue
Revenue from contracts with customers	169	163
TDS Telecom | Transferred over time | Commercial
Disaggregation of revenue
Revenue from contracts with customers	41	44
TDS Telecom | Transferred over time | Wholesale
Disaggregation of revenue
Revenue from contracts with customers	42	44
TDS Telecom | Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	0	0
TDS Telecom | Transferred at point in time | Equipment and product sales
Disaggregation of revenue
Revenue from contracts with customers	0	0
Corporate, Eliminations and Other
Disaggregation of revenue
Revenue from contracts with customers	59	47
Operating lease income	5	6
Total operating revenues	64	54
Corporate, Eliminations and Other | Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	18	17
Corporate, Eliminations and Other | Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	0	0
Corporate, Eliminations and Other | Transferred over time | Inbound roaming
Disaggregation of revenue
Revenue from contracts with customers	0	0
Corporate, Eliminations and Other | Transferred over time | Residential
Disaggregation of revenue
Revenue from contracts with customers	0	0
Corporate, Eliminations and Other | Transferred over time | Commercial
Disaggregation of revenue
Revenue from contracts with customers	0	0
Corporate, Eliminations and Other | Transferred over time | Wholesale
Disaggregation of revenue
Revenue from contracts with customers	0	0
Corporate, Eliminations and Other | Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	18	17
Corporate, Eliminations and Other | Transferred at point in time | Equipment and product sales
Disaggregation of revenue
Revenue from contracts with customers	$ 41	$ 30

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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