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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) |  |  |  |  |  |  |
Net income (loss) attributable to U.S. Cellular shareholders | $ | 36 |  |  | $ | (299 | ) |  | $ | 129 |  |  | $ | (261 | )
Weighted average number of shares used in basic earnings (loss) per share | 86 |  |  | 85 |  |  | 85 |  |  | 85 |
Effects of dilutive securities | 1 |  |  | — |  |  | 1 |  |  | — |
Weighted average number of shares used in diluted earnings (loss) per share | 87 |  |  | 85 |  |  | 86 |  |  | 85 |
Basic earnings (loss) per share attributable to U.S. Cellular shareholders | $ | 0.42 |  |  | $ | (3.51 | ) |  | $ | 1.51 |  |  | $ | (3.07 | )
Diluted earnings (loss) per share attributable to U.S. Cellular shareholders | $ | 0.41 |  |  | $ | (3.51 | ) |  | $ | 1.49 |  |  | $ | (3.07 | )

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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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