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Revenue Recognition - Disaggregation Of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 5,076	$ 5,019
Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,959	3,909
Transferred over time | Retail service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,650	2,623
Transferred over time | Inbound roaming
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	174	154
Transferred over time | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	533	509
Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	209	226
Transferred over time | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	185	191
Transferred over time | Other service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	208	206
Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,117	1,110
U.S. Cellular
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,948	3,901
U.S. Cellular | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,961	2,912
U.S. Cellular | Transferred over time | Retail service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,650	2,623
U.S. Cellular | Transferred over time | Inbound roaming
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	174	154
U.S. Cellular | Transferred over time | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
U.S. Cellular | Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
U.S. Cellular | Transferred over time | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
U.S. Cellular | Transferred over time | Other service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	137	135
U.S. Cellular | Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	987	989
TDS Telecom
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	927	927
TDS Telecom | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	926	925
TDS Telecom | Transferred over time | Retail service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
TDS Telecom | Transferred over time | Inbound roaming
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
TDS Telecom | Transferred over time | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	533	509
TDS Telecom | Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	209	226
TDS Telecom | Transferred over time | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	185	191
TDS Telecom | Transferred over time | Other service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(1)	(1)
TDS Telecom | Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	2
TDS Telecom Wireline
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	682	698
TDS Telecom Wireline | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	681	696
TDS Telecom Wireline | Transferred over time | Retail service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
TDS Telecom Wireline | Transferred over time | Inbound roaming
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
TDS Telecom Wireline | Transferred over time | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	328	321
TDS Telecom Wireline | Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	168	184
TDS Telecom Wireline | Transferred over time | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	185	191
TDS Telecom Wireline | Transferred over time | Other service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
TDS Telecom Wireline | Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	2
TDS Telecom Cable
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	246	230
TDS Telecom Cable | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	246	230
TDS Telecom Cable | Transferred over time | Retail service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
TDS Telecom Cable | Transferred over time | Inbound roaming
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
TDS Telecom Cable | Transferred over time | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	205	188
TDS Telecom Cable | Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	41	42
TDS Telecom Cable | Transferred over time | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
TDS Telecom Cable | Transferred over time | Other service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
TDS Telecom Cable | Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Corporate, Eliminations and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	201	191
Corporate, Eliminations and Other | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	72	72
Corporate, Eliminations and Other | Transferred over time | Retail service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Corporate, Eliminations and Other | Transferred over time | Inbound roaming
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Corporate, Eliminations and Other | Transferred over time | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Corporate, Eliminations and Other | Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Corporate, Eliminations and Other | Transferred over time | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Corporate, Eliminations and Other | Transferred over time | Other service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	72	72
Corporate, Eliminations and Other | Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 129	$ 119

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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