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Earnings Per Share | 3 Months Ended
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Mar. 31, 2020
Earnings Per Share [Abstract] |
Earnings Per Share | Note 6 Earnings Per Share Basic earnings per share attributable to U.S. Cellular shareholders is computed by dividing Net income attributable to U.S. Cellular shareholders by the weighted average number of Common Shares outstanding during the period. Diluted earnings per share attributable to U.S. Cellular shareholders is computed by dividing Net income attributable to U.S. Cellular 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 basic and diluted earnings per share attributable to U.S. Cellular shareholders were as follows:
| Three Months Ended March 31,
| 2020 |  | 2019
(Dollars and shares in millions, except per share amounts) |  |  |
Net income attributable to U.S. Cellular shareholders | $ | 71 |  |  | $ | 54 |
Weighted average number of shares used in basic earnings per share | 86 |  |  | 86 |
Effects of dilutive securities | 2 |  |  | 2 |
Weighted average number of shares used in diluted earnings per share | 88 |  |  | 88 |
Basic earnings per share attributable to U.S. Cellular shareholders | $ | 0.82 |  |  | $ | 0.63 |
Diluted earnings per share attributable to U.S. Cellular shareholders | $ | 0.81 |  |  | $ | 0.62 |
Certain Common Shares issuable upon the exercise of stock options or vesting of performance and restricted stock units were not included in weighted average diluted shares outstanding for the calculation of Diluted earnings per share attributable to U.S. Cellular shareholders because their effects were antidilutive. The number of such Common Shares excluded was 1 million and less than 1 million for the three months ended March 31, 2020 and 2019, 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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