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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Reconciliation of Information Used to Compute Basic and Diluted EPS | The information used to compute basic and diluted EPS attributable to Howmet common shareholders was as follows (shares in millions):
For the year ended December 31, | 2020 |  | 2019 |  | 2018
Net income from continuing operations attributable to common shareholders | $ | 211 |  |  | 126 |  |  | 309 |
Less: preferred stock dividends declared | 2 |  |  | 2 |  |  | 2 |
Net income from continuing operations attributable to common shareholders: | 209 |  |  | 124 |  |  | 307 |
Income from discontinued operations | 50 |  |  | 344 |  |  | 333 |
Net income available to Howmet Aerospace common shareholders - basic | 259 |  |  | 468 |  |  | 640 |
Add: interest expense related to convertible notes | — |  |  | 9 |  |  | 11 |
Net income available to Howmet common shareholders - diluted | $ | 259 |  |  | $ | 477 |  |  | $ | 651 |
Average shares outstanding - basic | 435 |  |  | 446 |  |  | 483 |
Effect of dilutive securities: |  |  |  |  |
Stock options | — |  |  | 1 |  |  | 1 |
Stock and performance awards | 4 |  |  | 5 |  |  | 5 |
Convertible notes(1) | — |  |  | 11 |  |  | 14 |
Average shares outstanding - diluted | 439 |  |  | 463 |  |  | 503 |
(1)The convertible notes matured on October 15, 2019 (see Note R). No shares of the Company’s common stock were issued in connection with the maturity or the final conversion of the convertible notes. As of October 15, 2019, the calculation of average diluted shares outstanding ceased to include the approximately 15 million shares of common stock and the corresponding interest expense previously attributable to the convertible notes.
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | The following shares were excluded from the calculation of average shares outstanding – diluted as their effect was anti-dilutive (shares in millions).
For the year ended December 31, | 2020 |  | 2019 |  | 2018
Convertible notes | — |  |  | — |  |  | — |
Stock options | 1 |  |  | 1 |  |  | 9 |
Stock awards | — |  |  | — |  |  | — |
(1)

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + 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 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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