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Earnings Per Share | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Earnings per Share | N ote 6 Earnings Per Share Basic earnings per share available to TDS common shareholders is computed by dividing Net income available to TDS common shareholders by the weighted average number of common shares outstanding during the period. Diluted earnings per share available to TDS common shareholders is computed by dividing Net income available to TDS common shareholders by the weighted average number of common shares outstanding during the period adjusted to include the effects of potentially dilutive securities. Potentially dilutive securities primarily include incremental shares issuable upon the exercise of outstanding stock options and the vesting of performance and restricted stock units. 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
| March 31,
| 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 | $ | 39 |  | $ | 37
Adjustments to compute diluted earnings: |  |  |  |  |
| Noncontrolling interest adjustment |  | – |  |  | –
| Net income available to TDS common shareholders |  |  |  |  |
|  | used in diluted earnings per share | $ | 39 |  | $ | 37
Weighted average number of shares used in basic |  |  |  |  |
| earnings per share: |  |  |  |  |
|  | Common Shares |  | 104 |  |  | 103
|  | Series A Common Shares |  | 7 |  |  | 7
|  |  | Total |  | 111 |  |  | 110
Effects of dilutive securities |  | 2 |  |  | 2
Weighted average number of shares used in diluted |  |  |  |  |
| earnings per share |  | 113 |  |  | 112
Basic earnings per share available to TDS common |  |  |  |  |
| shareholders | $ | 0.35 |  | $ | 0.34
Diluted earnings per share available to TDS common |  |  |  |  |
| shareholders | $ | 0.34 |  | $ | 0.33
Certain Common Shares issuable upon the exercise of stock options, vesting of performance and restricted stock units or conversion of preferred shares were not included in average diluted shares outstanding for the calculation of Diluted earnings per share available to TDS common shareholders because their effects were antidilutive. The number of such Common Shares excluded was 4 million for both the three months ended March 31, 2018 and 2017.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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