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EARNINGS PER SHARE (Tables) | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Earnings Per Share Computation | The following table summarizes the computation of basic and diluted earnings per share:
| (In Millions, Except Per Share Amounts)
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Income (loss) from continuing operations | $ | 1,281 |  |  | $ | 2 |  |  | $ | 2,132 |  |  | $ | (155) |
Income from continuing operations attributable to noncontrolling interest | (8) |  |  | (12) |  |  | (39) |  |  | (31) |
Net income (loss) from continuing operations attributable to Cliffs shareholders | 1,273 |  |  | (10) |  |  | 2,093 |  |  | (186) |
Income from discontinued operations, net of tax | 1 |  |  | — |  |  | 2 |  |  | — |
Net income (loss) attributable to Cliffs shareholders | $ | 1,274 |  |  | $ | (10) |  |  | $ | 2,095 |  |  | $ | (186) |
Weighted average number of shares: |  |  |  |  |  |  |
Basic | 500 |  |  | 399 |  |  | 497 |  | 365
Redeemable preferred shares | 17 |  |  | — |  |  | 44 |  | —
Convertible senior notes | 24 |  |  | — |  |  | 21 |  | —
Employee stock plans | 6 |  |  | — |  |  | 5 |  | —
Diluted | 547 |  |  | 399 |  |  | 567 |  | 365
Earnings (loss) per common share attributable to Cliffs shareholders - basic 1: |  |  |  |  |  |  |
Continuing operations | $ | 2.46 |  |  | $ | (0.02) |  |  | $ | 3.87 |  |  | $ | (0.51) |
Discontinued operations | — |  |  | — |  |  | — |  |  | — |
| $ | 2.46 |  |  | $ | (0.02) |  |  | $ | 3.87 |  |  | $ | (0.51) |
Earnings (loss) per common share attributable to Cliffs shareholders - diluted: |  |  |  |  |  |  |
Continuing operations | $ | 2.33 |  |  | $ | (0.02) |  |  | $ | 3.69 |  |  | $ | (0.51) |
Discontinued operations | — |  |  | — |  |  | — |  |  | — |
| $ | 2.33 |  |  | $ | (0.02) |  |  | $ | 3.69 |  |  | $ | (0.51) |
1 For the three and nine months ended September 30, 2021, basic earnings per share is calculated by dividing Net income (loss) attributable to Cliffs shareholders, less $42 million and $172 million, respectively, of earnings attributed to Series B Participating Redeemable Preferred Stock, by the weighted average number of basic common shares outstanding during the period presented.

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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=124432515&loc=d3e3550-109257 + Details
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