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Debt and Equity (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 04, 2020 | Apr. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Apr. 03, 2020 | Dec. 31, 2019
Total Debt [Abstract] |  |  |  |  |  |  |
Current portion of debt |  |  |  | $ (245) |  |  |
Long-term Debt, Current Maturities |  |  |  | 245 |  |  | $ 5
Long-term debt, less current portion |  |  |  | 9,829 |  |  |
Debt |  |  |  |  |  |  | 9,826
Long-term Debt and Lease Obligation, Including Current Maturities |  |  |  | 10,074 |  |  |
Proceeds from repayment of debt | $ 1,290 |  |  |  |  |  |
Net gain (loss) on exchanges and early extinguishment of debt |  |  |  | (32) | $ (6) |  |
Interest costs |  |  |  | $ 171 | $ 178 |  |
Dividends declared per share of common stock (in dollars per share) |  |  |  | $ 0 | $ 0.05 |  |
COVID Response, Dividend Suspended, Price Per Share |  |  |  | $ 0.05 |  |  |
Long-term debt, less current portion |  |  |  | $ 9,829 |  |  | 9,821
Senior Notes due 2028, 4.125% [Member] [Domain] |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Debt | $ 700 |  |  |  |  |  |
Stated interest rate | 4.125% |  |  |  |  |  |
Senior Notes due 2030, 4.25% [Member] [Domain] |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Debt | $ 600 |  |  |  |  |  |
Stated interest rate | 4.25% |  |  |  |  |  |
Senior Notes due 2021, 4.00% |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Stated interest rate | 4.00% |  |  |  |  |  |
3.55% Senior Notes Due 2022 [Member] |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Stated interest rate | 3.55% |  |  |  |  |  |
Property, Plant and Equipment [Member] |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Interest costs capitalized |  |  |  | 44 | $ 32 |  |
Line of Credit [Member] | Cerro Verde [Member] |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  | 826
Long-term Debt and Lease Obligation, Including Current Maturities |  |  |  | 826 |  |  |
Line of Credit [Member] | Letter of Credit [Member] |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Letter of credit |  |  |  | 13 |  |  |
Revolving credit facility, availability |  |  |  | 1,500 |  |  |
Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Debt |  |  |  | 0 |  |  |
Revolving credit facility, availability |  |  |  | 3,500 |  |  |
Line of Credit [Member] | Revolving Credit Facility [Member] | Maturing 2024 [Member] |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Revolving credit facility, availability |  |  |  | 3,280 |  |  |
Line of Credit [Member] | Revolving Credit Facility [Member] | Maturing 2023 [Member] |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Revolving credit facility, availability |  |  |  | 220 |  |  |
Senior Notes [Member] |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Debt, principal |  |  |  | 1,115 |  |  |
Net gain (loss) on exchanges and early extinguishment of debt |  |  |  | 32 |  |  |
Net Adjustments |  |  |  | 5 |  |  |
Extinguishment of Debt, Amount |  |  |  | 1,110 |  |  |
Tender Value |  |  |  | 1,142 |  |  |
Senior Notes [Member] | Senior Notes due 2021, 4.00% |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Debt, principal |  |  |  | 40 |  |  |
Net gain (loss) on exchanges and early extinguishment of debt |  |  |  | 2 |  |  |
Net Adjustments |  |  |  | 0 |  |  |
Extinguishment of Debt, Amount |  |  |  | 40 |  |  |
Tender Value |  |  |  | 42 |  |  |
Senior Notes [Member] | 3.55% Senior Notes Due 2022 [Member] |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Debt, principal |  |  |  | 1,075 |  |  |
Net gain (loss) on exchanges and early extinguishment of debt |  |  |  | 30 |  |  |
Net Adjustments |  |  |  | 5 |  |  |
Extinguishment of Debt, Amount |  |  |  | 1,070 |  |  |
Tender Value |  |  |  | 1,100 |  |  |
Senior Notes [Member] | FCX [Member] |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Long-term Debt and Lease Obligation, Including Current Maturities |  |  |  | 8,773 |  |  | 8,602
Debentures [Member] | Freeport McMoRan Corporation [Member] |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Long-term Debt and Lease Obligation, Including Current Maturities |  |  |  | 357 |  |  | 357
Other Debt, Including Capital Leases and Short Term Borrowings [Member] |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  | $ 41
Long-term Debt and Lease Obligation, Including Current Maturities |  |  |  | $ 118 |  |  |
Subsequent event | Senior Notes due 2021, 4.00% |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 4.00% |
Subsequent event | Senior Notes [Member] | Senior Notes due 2021, 4.00% |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  | $ 154 |  |  |  |  |
Forecast |  |  |  |  |  |  |
Total Debt [Abstract] |  |  |  |  |  |  |
Net gain (loss) on exchanges and early extinguishment of debt |  |  | $ (9) |  |  |  |

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