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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 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:
Year Ended December 31, | 2018 |  | 2017 |  | 2016
(Dollars and shares in millions, except per share amounts) |  |  |  |  |
Net income attributable to U.S. Cellular shareholders | $ | 150 |  |  | $ | 12 |  |  | $ | 48 |
Weighted average number of shares used in basic earnings per share | 86 |  |  | 85 |  |  | 85 |
Effects of dilutive securities | 1 |  |  | 1 |  |  | — |
Weighted average number of shares used in diluted earnings per share | 87 |  |  | 86 |  |  | 85 |
Basic earnings per share attributable to U.S. Cellular shareholders | $ | 1.75 |  |  | $ | 0.14 |  |  | $ | 0.56 |
Diluted earnings per share attributable to U.S. Cellular shareholders | $ | 1.72 |  |  | $ | 0.14 |  |  | $ | 0.56 |

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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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