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Earnings Per Share | 9 Months Ended
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Sep. 30, 2019
Earnings Per Share [Abstract] |
Earnings Per Share | Note 5 Earnings Per Share Basic earnings per share attributable to TDS shareholders is computed by dividing Net income attributable to TDS shareholders by the weighted average number of Common Shares outstanding during the period. Diluted earnings per share attributable to TDS shareholders is computed by dividing Net income attributable to TDS 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 September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
(Dollars and shares in millions, except per share amounts) |  |  |  |  |  |  |  |  |  |
Basic earnings per share attributable to TDS shareholders: |  |  |  |  |  |  |  |  |  |
Net income attributable to TDS shareholders used in basic earnings per share | $ | 18 |  |  | $ | 46 |  |  | $ | 110 |  |  | $ | 119 |
Adjustments to compute diluted earnings: |  |  |  |  |  |  |
Noncontrolling interest adjustment | (1 | ) |  | — |  |  | (2 | ) |  | (2 | )
Net income attributable to TDS shareholders used in diluted earnings per share | $ | 17 |  |  | $ | 46 |  |  | $ | 108 |  |  | $ | 117 |
Weighted average number of shares used in basic earnings per share: |  |  |  |  |  |  |
Common Shares | 108 |  |  | 105 |  |  | 107 |  |  | 105 |
Series A Common Shares | 7 |  |  | 7 |  |  | 7 |  |  | 7 |
Total | 115 |  |  | 112 |  |  | 114 |  |  | 112 |
Effects of dilutive securities | 1 |  |  | 2 |  |  | 2 |  |  | 1 |
Weighted average number of shares used in diluted earnings per share | 116 |  |  | 114 |  |  | 116 |  |  | 113 |
Basic earnings per share attributable to TDS shareholders | $ | 0.15 |  |  | $ | 0.41 |  |  | $ | 0.96 |  |  | $ | 1.06 |
Diluted earnings per share attributable to TDS shareholders | $ | 0.15 |  |  | $ | 0.41 |  |  | $ | 0.93 |  |  | $ | 1.04 |
Certain Common Shares issuable upon the exercise of stock options or vesting of performance and restricted stock units were not included in average diluted shares outstanding for the calculation of Diluted earnings per share attributable to TDS shareholders because their effects were antidilutive. The number of such Common Shares excluded was 3 million and less than 1 million for the three and nine months ended September 30, 2019, respectively, and 3 million and 4 million for the three and nine months ended September 30, 2018, respectively.

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