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Earnings per Share (Unaudited) Earnings per Share (Notes) | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Earnings Per Share | EARNINGS PER SHARE FCX calculates its basic net income per share of common stock under the two-class method and calculates its diluted net income (loss) per share of common stock using the more dilutive of the two-class method or the treasury-stock method. Basic net income (loss) per share of common stock was computed by dividing net income (loss) attributable to common stockholders (after deducting accumulated dividends and undistributed earnings to participating securities) by the weighted-average shares of common stock outstanding during the period. Diluted net income (loss) per share of common stock was calculated by including the basic weighted-average shares of common stock outstanding adjusted for the effects of all potential dilutive shares of common stock. Reconciliations of net income and weighted-average shares of common stock outstanding for purposes of calculating basic and diluted net income (loss) per share follow (in millions, except per share amounts):
| Three Months Ended |  | Nine Months Ended |
| September 30, |  | September 30, |
| 2021 |  | 2020 |  | 2021 |  | 2020 |
Net income | $ | 1,723 |  |  | $ | 432 |  |  | $ | 4,007 |  |  | $ | 7 |  |
Net income attributable to noncontrolling interests | (324) |  |  | (103) |  |  | (807) |  |  | (116) |  |
Undistributed earnings allocated to participating securities | (4) |  |  | (3) |  |  | (6) |  |  | (3) |  |
Net income (loss) attributable to common stockholders | $ | 1,395 |  |  | $ | 326 |  |  | $ | 3,194 |  |  | $ | (112) |  |
Basic weighted-average shares of common stock outstanding | 1,469 |  |  | 1,453 |  |  | 1,466 |  |  | 1,453 |  |
Add shares issuable upon exercise or vesting of dilutive stock options and restricted stock units (RSUs) | 15 |  |  | 8 |  | a | 15 |  |  | — |  | a
Diluted weighted-average shares of common stock outstanding | 1,484 |  |  | 1,461 |  |  | 1,481 |  |  | 1,453 |  |
Basic net income (loss) per share attributable to common stockholders | $ | 0.95 |  |  | $ | 0.22 |  |  | $ | 2.18 |  |  | $ | (0.08) |  |
Diluted net income (loss) per share attributable to common stockholders | $ | 0.94 |  |  | $ | 0.22 |  |  | $ | 2.16 |  |  | $ | (0.08) |  |
a.Excludes approximately 2 million shares in third-quarter 2020 and 13 million shares for the first nine months of 2020 associated with outstanding stock options with exercise prices less than the average market price of FCX’s common stock and RSUs that were anti-dilutive. Outstanding stock options with exercise prices greater than the average market price of FCX’s common stock during the period are excluded from the computation of diluted net income (loss) per share of common stock. Stock options for 4 million shares of common stock in third-quarter 2021, 28 million shares of common stock in third-quarter 2020, 6 million shares of common stock for the first nine months of 2021 and 35 million shares of common stock the first nine months of 2020 were excluded.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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