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Revenue Recognition - Disaggregation Of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of revenue
Revenue from contracts with customers	$ 1,238	$ 1,233	$ 2,473	$ 2,435
Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	990	971	1,963	1,925
Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	662	652	1,322	1,301
Transferred over time | Inbound roaming
Disaggregation of revenue
Revenue from contracts with customers	44	39	78	66
Transferred over time | Residential
Disaggregation of revenue
Revenue from contracts with customers	131	127	262	253
Transferred over time | Commercial
Disaggregation of revenue
Revenue from contracts with customers	54	57	107	114
Transferred over time | Wholesale
Disaggregation of revenue
Revenue from contracts with customers	48	46	94	93
Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	51	51	100	98
Transferred at point in time | Equipment and product sales
Disaggregation of revenue
Revenue from contracts with customers	248	262	510	510
U.S. Cellular
Disaggregation of revenue
Revenue from contracts with customers	957	957	1,907	1,882
U.S. Cellular | Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	741	724	1,466	1,432
U.S. Cellular | Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	662	652	1,322	1,301
U.S. Cellular | Transferred over time | Inbound roaming
Disaggregation of revenue
Revenue from contracts with customers	44	39	78	66
U.S. Cellular | Transferred over time | Residential
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
U.S. Cellular | Transferred over time | Commercial
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
U.S. Cellular | Transferred over time | Wholesale
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
U.S. Cellular | Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	35	33	66	65
U.S. Cellular | Transferred at point in time | Equipment and product sales
Disaggregation of revenue
Revenue from contracts with customers	216	233	441	450
TDS Telecom Total
Disaggregation of revenue
Revenue from contracts with customers	233	230	463	460
TDS Telecom Total | Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	233	229	462	459
TDS Telecom Total | Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
TDS Telecom Total | Transferred over time | Inbound roaming
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
TDS Telecom Total | Transferred over time | Residential
Disaggregation of revenue
Revenue from contracts with customers	131	127	262	253
TDS Telecom Total | Transferred over time | Commercial
Disaggregation of revenue
Revenue from contracts with customers	54	57	107	114
TDS Telecom Total | Transferred over time | Wholesale
Disaggregation of revenue
Revenue from contracts with customers	48	46	94	93
TDS Telecom Total | Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	0	0	(1)	(1)
TDS Telecom Total | Transferred at point in time | Equipment and product sales
Disaggregation of revenue
Revenue from contracts with customers	0	1	1	1
TDS Telecom Wireline
Disaggregation of revenue
Revenue from contracts with customers	172	173	342	349
TDS Telecom Wireline | Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	172	173	342	348
TDS Telecom Wireline | Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
TDS Telecom Wireline | Transferred over time | Inbound roaming
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
TDS Telecom Wireline | Transferred over time | Residential
Disaggregation of revenue
Revenue from contracts with customers	81	80	162	160
TDS Telecom Wireline | Transferred over time | Commercial
Disaggregation of revenue
Revenue from contracts with customers	42	46	86	94
TDS Telecom Wireline | Transferred over time | Wholesale
Disaggregation of revenue
Revenue from contracts with customers	48	46	94	93
TDS Telecom Wireline | Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
TDS Telecom Wireline | Transferred at point in time | Equipment and product sales
Disaggregation of revenue
Revenue from contracts with customers	0	0	1	1
TDS Telecom Cable
Disaggregation of revenue
Revenue from contracts with customers	62	57	121	112
TDS Telecom Cable | Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	62	57	121	112
TDS Telecom Cable | Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
TDS Telecom Cable | Transferred over time | Inbound roaming
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
TDS Telecom Cable | Transferred over time | Residential
Disaggregation of revenue
Revenue from contracts with customers	51	47	100	92
TDS Telecom Cable | Transferred over time | Commercial
Disaggregation of revenue
Revenue from contracts with customers	11	10	21	20
TDS Telecom Cable | Transferred over time | Wholesale
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
TDS Telecom Cable | Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
TDS Telecom Cable | Transferred at point in time | Equipment and product sales
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
Corporate, Eliminations and Other
Disaggregation of revenue
Revenue from contracts with customers	48	46	103	93
Corporate, Eliminations and Other | Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	16	18	35	34
Corporate, Eliminations and Other | Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
Corporate, Eliminations and Other | Transferred over time | Inbound roaming
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
Corporate, Eliminations and Other | Transferred over time | Residential
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
Corporate, Eliminations and Other | Transferred over time | Commercial
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
Corporate, Eliminations and Other | Transferred over time | Wholesale
Disaggregation of revenue
Revenue from contracts with customers	0	0	0	0
Corporate, Eliminations and Other | Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	16	18	35	34
Corporate, Eliminations and Other | Transferred at point in time | Equipment and product sales
Disaggregation of revenue
Revenue from contracts with customers	$ 32	$ 28	$ 68	$ 59

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