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Revenue Recognition Disaggregation Of Revenue (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
		Jun. 30, 2018	Jun. 30, 2018
Revenue from contracts with customers
Revenue from contracts with customers	[1]	$ 1,233	$ 2,435
Transferred over time
Revenue from contracts with customers
Revenue from contracts with customers		971	1,925
Transferred over time | Retail service
Revenue from contracts with customers
Revenue from contracts with customers		652	1,301
Transferred over time | Inbound roaming
Revenue from contracts with customers
Revenue from contracts with customers		39	66
Transferred over time | Residential
Revenue from contracts with customers
Revenue from contracts with customers		127	253
Transferred over time | Commercial
Revenue from contracts with customers
Revenue from contracts with customers		57	114
Transferred over time | Wholesale
Revenue from contracts with customers
Revenue from contracts with customers		46	93
Transferred over time | Other service
Revenue from contracts with customers
Revenue from contracts with customers		51	98
Transferred at point in time | Equipment and product sales
Revenue from contracts with customers
Revenue from contracts with customers		262	510
U.S. Cellular
Revenue from contracts with customers
Revenue from contracts with customers	[1]	957	1,882
U.S. Cellular | Transferred over time
Revenue from contracts with customers
Revenue from contracts with customers		724	1,432
U.S. Cellular | Transferred over time | Retail service
Revenue from contracts with customers
Revenue from contracts with customers		652	1,301
U.S. Cellular | Transferred over time | Inbound roaming
Revenue from contracts with customers
Revenue from contracts with customers		39	66
U.S. Cellular | Transferred over time | Other service
Revenue from contracts with customers
Revenue from contracts with customers		33	65
U.S. Cellular | Transferred at point in time | Equipment and product sales
Revenue from contracts with customers
Revenue from contracts with customers		233	450
TDS Telecom
Revenue from contracts with customers
Revenue from contracts with customers	[1]	230	460
TDS Telecom | Transferred over time
Revenue from contracts with customers
Revenue from contracts with customers		229	459
TDS Telecom | Transferred over time | Residential
Revenue from contracts with customers
Revenue from contracts with customers		127	253
TDS Telecom | Transferred over time | Commercial
Revenue from contracts with customers
Revenue from contracts with customers		57	114
TDS Telecom | Transferred over time | Wholesale
Revenue from contracts with customers
Revenue from contracts with customers		46	93
TDS Telecom | Transferred over time | Other service
Revenue from contracts with customers
Revenue from contracts with customers			(1)
TDS Telecom | Transferred at point in time | Equipment and product sales
Revenue from contracts with customers
Revenue from contracts with customers		1	1
TDS Telecom Wireline
Revenue from contracts with customers
Revenue from contracts with customers	[1]	173	349
TDS Telecom Wireline | Transferred over time
Revenue from contracts with customers
Revenue from contracts with customers		173	348
TDS Telecom Wireline | Transferred over time | Residential
Revenue from contracts with customers
Revenue from contracts with customers		80	160
TDS Telecom Wireline | Transferred over time | Commercial
Revenue from contracts with customers
Revenue from contracts with customers		46	94
TDS Telecom Wireline | Transferred over time | Wholesale
Revenue from contracts with customers
Revenue from contracts with customers		46	93
TDS Telecom Wireline | Transferred at point in time | Equipment and product sales
Revenue from contracts with customers
Revenue from contracts with customers			1
TDS Telecom Cable
Revenue from contracts with customers
Revenue from contracts with customers	[1]	57	112
TDS Telecom Cable | Transferred over time
Revenue from contracts with customers
Revenue from contracts with customers		57	112
TDS Telecom Cable | Transferred over time | Residential
Revenue from contracts with customers
Revenue from contracts with customers		47	92
TDS Telecom Cable | Transferred over time | Commercial
Revenue from contracts with customers
Revenue from contracts with customers		10	20
Corporate, Eliminations and Other
Revenue from contracts with customers
Revenue from contracts with customers	[1]	46	93
Corporate, Eliminations and Other | Transferred over time
Revenue from contracts with customers
Revenue from contracts with customers		18	34
Corporate, Eliminations and Other | Transferred over time | Other service
Revenue from contracts with customers
Revenue from contracts with customers		18	34
Corporate, Eliminations and Other | Transferred at point in time | Equipment and product sales
Revenue from contracts with customers
Revenue from contracts with customers		$ 28	$ 59
[1] These amounts do not include revenues outside the scope of ASU 2014-09; therefore, revenue line items in this table will not agree to amounts presented in the Consolidated Statement of Operations.

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- Definition

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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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