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Revenue Recognition Disaggregation Of Revenue (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($)
Revenue from contracts with customers |  |
Revenue from contracts with customers | $ 1,203 | [1]
Transferred over time |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 956 |
Transferred over time | Retail service |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 649 |
Transferred over time | Inbound roaming |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 27 |
Transferred over time | Residential |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 126 |
Transferred over time | Commercial |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 57 |
Transferred over time | Wholesale |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 47 |
Transferred over time | Other service |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 50 |
Transferred at point in time | Equipment and product sales |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 247 |
U.S. Cellular |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 926 | [1]
U.S. Cellular | Transferred over time |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 708 |
U.S. Cellular | Transferred over time | Retail service |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 649 |
U.S. Cellular | Transferred over time | Inbound roaming |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 27 |
U.S. Cellular | Transferred over time | Other service |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 32 |
U.S. Cellular | Transferred at point in time | Equipment and product sales |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 218 |
TDS Telecom |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 230 | [1]
TDS Telecom | Transferred over time |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 230 |
TDS Telecom | Transferred over time | Residential |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 126 |
TDS Telecom | Transferred over time | Commercial |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 57 |
TDS Telecom | Transferred over time | Wholesale |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 47 |
TDS Telecom Wireline |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 175 | [1]
TDS Telecom Wireline | Transferred over time |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 175 |
TDS Telecom Wireline | Transferred over time | Residential |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 80 |
TDS Telecom Wireline | Transferred over time | Commercial |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 48 |
TDS Telecom Wireline | Transferred over time | Wholesale |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 47 |
TDS Telecom Cable |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 55 | [1]
TDS Telecom Cable | Transferred over time |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 55 |
TDS Telecom Cable | Transferred over time | Residential |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 46 |
TDS Telecom Cable | Transferred over time | Commercial |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 10 |
Corporate, Eliminations and Other |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 47 | [1]
Corporate, Eliminations and Other | Transferred over time |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 18 |
Corporate, Eliminations and Other | Transferred over time | Other service |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 18 |
Corporate, Eliminations and Other | Transferred at point in time | Equipment and product sales |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | $ 29 |
[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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