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Revenue Recognition - Disaggregation Of Revenue (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
		Sep. 30, 2018	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	[1]	$ 1,275	$ 3,709
Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		995	2,920
Transferred over time | Retail service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		659	1,960
Transferred over time | Inbound roaming
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		50	116
Transferred over time | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		128	381
Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		56	170
Transferred over time | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		50	143
Transferred over time | Other service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		52	150
Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		280	789
U.S. Cellular
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	[1]	985	2,867
U.S. Cellular | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		743	2,175
U.S. Cellular | Transferred over time | Retail service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		659	1,960
U.S. Cellular | Transferred over time | Inbound roaming
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		50	116
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		34	99
U.S. Cellular | Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		242	692
TDS Telecom Total
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	[1]	234	694
TDS Telecom Total | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		233	693
TDS Telecom Total | Transferred over time | Retail service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		0	0
TDS Telecom Total | Transferred over time | Inbound roaming
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		0	0
TDS Telecom Total | Transferred over time | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		128	381
TDS Telecom Total | Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		56	170
TDS Telecom Total | Transferred over time | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		50	143
TDS Telecom Total | Transferred over time | Other service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		0	(1)
TDS Telecom Total | Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		0	1
TDS Telecom Wireline
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	[1]	176	525
TDS Telecom Wireline | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		176	524
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		81	241
TDS Telecom Wireline | Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		46	140
TDS Telecom Wireline | Transferred over time | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		50	143
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		0	1
TDS Telecom Cable
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	[1]	58	170
TDS Telecom Cable | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		58	170
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		47	140
TDS Telecom Cable | Transferred over time | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		10	30
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	[1]	56	148
Corporate, Eliminations and Other | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		18	52
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		18	52
Corporate, Eliminations and Other | Transferred at point in time | Equipment and product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		$ 38	$ 96
[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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