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Debt and Equity (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 25, 2019 | Aug. 15, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | May 02, 2019 | Mar. 27, 2019 | Dec. 31, 2018
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Total debt |  |  | $ 9,919,000,000 |  |  | $ 9,919,000,000 |  |  |  | $ 11,141,000,000
Current portion of debt |  |  | (4,000,000) |  |  | (4,000,000) |  |  |  | (17,000,000)
Long-term debt, less current portion |  |  | 9,915,000,000 |  |  | 9,915,000,000 |  |  |  | 11,124,000,000
Proceeds from repayment of debt |  | $ 1,187,000,000 |  |  |  |  |  |  |  |
Net gain (loss) on exchanges and early extinguishment of debt |  |  | (21,000,000) |  | $ 0 | (27,000,000) | $ 8,000,000 |  |  |
Interest costs |  |  | $ 163,000,000 |  | $ 167,000,000 | $ 508,000,000 | $ 508,000,000 |  |  |
Dividends declared per share of common stock (in dollars per share) | $ 0.05 |  | $ 0.05 |  | $ 0.05 | $ 0.15 | $ 0.15 |  |  |
Senior Notes due 2027, 5.00% |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Debt |  | $ 600,000,000 |  |  |  |  |  |  |  |
Stated interest rate |  | 5.00% |  |  |  |  |  |  |  |
Senior Notes due 2029, 5.25% |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Debt |  | $ 600,000,000 |  |  |  |  |  |  |  |
Stated interest rate |  | 5.25% |  |  |  |  |  |  |  |
Senior Notes due 2023, 6.875% |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 6.875% |  |  |  |  |  |  |  |
Senior Notes due 2021, 4.00% |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.00% |  |  |  |  |  |  |  |
Senior Notes due 2022, 3.55% |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.55% |  |  |  |  |  |  |  |
Property, Plant and Equipment [Member] |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Interest costs capitalized |  |  | $ 40,000,000 |  | $ 24,000,000 | $ 107,000,000 | $ 72,000,000 |  |  |
Line of Credit [Member] | Cerro Verde [Member] |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Total debt |  |  | 825,000,000 |  |  | 825,000,000 |  |  |  | 1,023,000,000
Line of Credit [Member] | Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Letter of credit |  |  | 13,000,000 |  |  | 13,000,000 |  |  |  |
Revolving credit facility, availability |  |  | 1,500,000,000 |  |  | 1,500,000,000 |  |  |  |
Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Debt |  |  | 0 |  |  | 0 |  |  |  |
Revolving credit facility, availability |  |  | 3,500,000,000 |  |  | 3,500,000,000 |  |  |  |
Line of Credit [Member] | Revolving Credit Facility [Member] | Amended Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Revolving credit facility, availability |  |  |  |  |  |  |  | $ 3,500,000,000 |  |
Line of Credit [Member] | Revolving Credit Facility [Member] | Amended Credit Facility, Maturing April 20, 2024 [Member] |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Revolving credit facility, availability |  |  |  |  |  |  |  | 3,260,000,000 |  |
Line of Credit [Member] | Revolving Credit Facility [Member] | Amended Credit Facility, Maturing April 20, 2023 [Member] |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Revolving credit facility, availability |  |  |  |  |  |  |  | $ 240,000,000 |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Debt, principal |  |  | 1,145,000,000 |  |  | 1,145,000,000 |  |  |  |
Net gain (loss) on exchanges and early extinguishment of debt |  |  |  | $ (1,000,000) |  | 21,000,000 |  |  |  |
Repayments of credit facility |  |  |  | 200,000,000 |  |  |  |  |  |
Net Adjustments |  |  | 32,000,000 |  |  | 32,000,000 |  |  |  |
Book Value |  |  |  |  |  | 1,177,000,000 |  |  |  |
Redemption/Tender Value |  |  |  |  |  | 1,198,000,000 |  |  |  |
Senior Notes [Member] | 3.100% Senior Notes due March 2020 [Member] |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Debt, principal |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 |
Stated interest rate |  |  |  |  |  |  |  |  | 3.10% |
Net gain (loss) on exchanges and early extinguishment of debt |  |  |  | $ (5,000,000) |  |  |  |  |  |
Senior Notes [Member] | Senior Notes due 2023, 6.875% |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Debt, principal |  |  | 728,000,000 |  |  | 728,000,000 |  |  |  |
Net gain (loss) on exchanges and early extinguishment of debt |  |  |  |  |  | 6,000,000 |  |  |  |
Net Adjustments |  |  | 34,000,000 |  |  | 34,000,000 |  |  |  |
Book Value |  |  |  |  |  | 762,000,000 |  |  |  |
Redemption/Tender Value |  |  |  |  |  | 768,000,000 |  |  |  |
Senior Notes [Member] | Senior Notes due 2021, 4.00% |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Debt, principal |  |  | 405,000,000 |  |  | 405,000,000 |  |  |  |
Net gain (loss) on exchanges and early extinguishment of debt |  |  |  |  |  | 15,000,000 |  |  |  |
Net Adjustments |  |  | (2,000,000) |  |  | (2,000,000) |  |  |  |
Book Value |  |  |  |  |  | 403,000,000 |  |  |  |
Redemption/Tender Value |  |  |  |  |  | 418,000,000 |  |  |  |
Senior Notes [Member] | Senior Notes due 2023, 6.875% |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Debt, principal |  |  | 12,000,000 |  |  | 12,000,000 |  |  |  |
Net gain (loss) on exchanges and early extinguishment of debt |  |  |  |  |  | 0 |  |  |  |
Net Adjustments |  |  | 0 |  |  | 0 |  |  |  |
Book Value |  |  |  |  |  | 12,000,000 |  |  |  |
Redemption/Tender Value |  |  |  |  |  | 12,000,000 |  |  |  |
Senior Notes [Member] | FCX [Member] |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Total debt |  |  | 8,600,000,000 |  |  | 8,600,000,000 |  |  |  | 9,594,000,000
Debentures [Member] | Freeport McMoRan Corporation [Member] |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Total debt |  |  | 357,000,000 |  |  | 357,000,000 |  |  |  | 358,000,000
Other Debt, Including Capital Leases and Short Term Borrowings [Member] |  |  |  |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Total debt |  |  | $ 137,000,000 |  |  | $ 137,000,000 |  |  |  | $ 166,000,000

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