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Supplemental Financial Information (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Data |
| First | Second(2) | Third | Fourth | Year
2020 |  |  |  |  |
Sales | $ | 1,634 |  | $ | 1,253 |  | $ | 1,134 |  | $ | 1,238 |  | $ | 5,259 |
Income (loss) from continuing operations after income taxes | $ | 153 |  | $ | (84) |  | $ | 36 |  | $ | 106 |  | $ | 211 |
Net income (loss) per share from continuing operations attributable to Howmet common shareholders(1): |  |  |  |  |
Net income (loss) from continuing operations - basic | $ | 0.35 |  | $ | (0.19) |  | $ | 0.08 |  | $ | 0.24 |  | $ | 0.48 |
Net income (loss) from continuing operations - diluted | $ | 0.34 |  | $ | (0.19) |  | $ | 0.08 |  | $ | 0.24 |  | $ | 0.48 |
2019 |  |  |  |  |
Sales | $ | 1,752 |  | $ | 1,818 |  | $ | 1,794 |  | $ | 1,734 |  | $ | 7,098 |
Income (loss) from continuing operations after income taxes | $ | 86 |  | $ | (136) |  | $ | 58 |  | $ | 118 |  | $ | 126 |
Earnings (loss) per share attributable to Howmet common shareholders(1): |  |  |  |  |
Net income (loss) from continuing operations - basic | $ | 0.18 |  | $ | (0.31) |  | $ | 0.13 |  | $ | 0.27 |  | $ | 0.28 |
Net income (loss) from continuing operations - diluted | $ | 0.18 |  | $ | (0.31) |  | $ | 0.13 |  | $ | 0.27 |  | $ | 0.27 |
(1)Per share amounts are calculated independently for each period presented; therefore, the sum of the quarterly per share amounts may not equal the per share amounts for the year. (2)In the second quarter of 2020, the Company recorded settlement accounting charges of $62 associated with its U.K. pension plan related to the Arconic Inc. Separation Transaction and premium paid on early redemption of debt of $59. In the second quarter of 2019, the Company recorded an impairment charge of $428 related to its Disks business (see Note O).

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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