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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Earnings per share | The amounts used in computing earnings per common share and the effects of potentially dilutive securities on the weighted average number of common shares were as follows:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
(Dollars and shares in millions, except per share amounts) |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share available to TDS common |  |  |  |  |  |  |  |  |  |  |
|  | shareholders: |  |  |  |  |  |  |  |  |  |  |
| Net income available to TDS common shareholders used in basic earnings per share | $ | 33 |  | $ | 10 |  | $ | 72 |  | $ | 47
Adjustments to compute diluted earnings: |  |  |  |  |  |  |  |  |  |  |
| Noncontrolling interest adjustment |  | (1) |  |  | – |  |  | (1) |  |  | –
| Net income available to TDS common shareholders |  |  |  |  |  |  |  |  |  |  |
|  | used in diluted earnings per share | $ | 32 |  | $ | 10 |  | $ | 71 |  | $ | 47
Weighted average number of shares used in basic |  |  |  |  |  |  |  |  |  |  |
| earnings per share: |  |  |  |  |  |  |  |  |  |  |
|  | Common Shares |  | 105 |  |  | 104 |  |  | 105 |  |  | 103
|  | Series A Common Shares |  | 7 |  |  | 7 |  |  | 7 |  |  | 7
|  |  | Total |  | 112 |  |  | 111 |  |  | 112 |  |  | 110
Effects of dilutive securities |  | 1 |  |  | 1 |  |  | 1 |  |  | 2
Weighted average number of shares used in diluted |  |  |  |  |  |  |  |  |  |  |
| earnings per share |  | 113 |  |  | 112 |  |  | 113 |  |  | 112
Basic earnings per share available to TDS common |  |  |  |  |  |  |  |  |  |  |
| shareholders | $ | 0.30 |  | $ | 0.09 |  | $ | 0.65 |  | $ | 0.43
Diluted earnings per share available to TDS common |  |  |  |  |  |  |  |  |  |  |
| shareholders | $ | 0.29 |  | $ | 0.09 |  | $ | 0.63 |  | $ | 0.42

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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