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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Earnings per share | The amounts used in computing earnings (loss) per common share and the effects of potentially dilutive securities on the weighted average number of common shares were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
(Dollars and shares in millions, except per share amounts) |  |  |  |  |  |  |  |  |  |
Basic earnings (loss) per share available to TDS common shareholders: |  |  |  |  |  |  |  |  |  |
Net income (loss) available to TDS common shareholders used in basic earnings (loss) per share | $ | 46 |  |  | $ | (181 | ) |  | $ | 119 |  |  | $ | (134 | )
Adjustments to compute diluted earnings (loss): |  |  |  |  |  |  |
Noncontrolling interest adjustment | — |  |  | — |  |  | (2 | ) |  | — |
Net income (loss) available to TDS common shareholders used in diluted earnings (loss) per share | $ | 46 |  |  | $ | (181 | ) |  | $ | 117 |  |  | $ | (134 | )
Weighted average number of shares used in basic earnings (loss) per share: |  |  |  |  |  |  |
Common Shares | 105 |  |  | 104 |  |  | 105 |  |  | 104 |
Series A Common Shares | 7 |  |  | 7 |  |  | 7 |  |  | 7 |
Total | 112 |  |  | 111 |  |  | 112 |  |  | 111 |
Effects of dilutive securities | 2 |  |  | — |  |  | 1 |  |  | — |
Weighted average number of shares used in diluted earnings (loss) per share | 114 |  |  | 111 |  |  | 113 |  |  | 111 |
Basic earnings (loss) per share available to TDS common shareholders | $ | 0.41 |  |  | $ | (1.64 | ) |  | $ | 1.06 |  |  | $ | (1.21 | )
Diluted earnings (loss) per share available to TDS common shareholders | $ | 0.41 |  |  | $ | (1.64 | ) |  | $ | 1.04 |  |  | $ | (1.21 | )

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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://fasb.org/us-gaap/role/ref/legacyRef -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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