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Debt and Equity - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 22, 2022 | Apr. 30, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Aug. 05, 2022 | Jul. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 11,092 |  | $ 11,092 |  |  |  | $ 9,450
Repayments of debt |  |  |  |  | 2,993 | $ 179 |  |  |
Net gain on early extinguishment of debt |  |  | (8) | $ 0 | (8) | 0 |  |  |
Interest costs |  |  | $ 189 | $ 165 | $ 342 | $ 325 |  |  |
Treasury stock purchases (in shares) |  |  | 17.1 |  | 29.4 |  |  |  |
Shares repurchased |  |  | $ 645 |  | $ 1,200 |  |  |  |
Cost per share repurchased (in dollars per share) |  |  | $ 37.66 |  | $ 40.32 |  |  |  |
Stock repurchase program, authorized amount |  |  | $ 3,000 |  | $ 3,000 |  |  |  |
Dividends declared per share of common stock (in dollars per share) | $ 0.15 |  | $ 0.15 | $ 0.075 | $ 0.30 | $ 0.15 |  |  |
Base cash dividend (in dollars per share) | 0.075 |  |  |  |  |  |  |  |
Variable cash dividend (in dollars per share) | $ 0.075 |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Treasury stock purchases (in shares) |  |  |  |  |  |  | 47.9 |  |
Shares repurchased |  |  |  |  |  |  | $ 1,800 |  |
Cost per share repurchased (in dollars per share) |  |  |  |  |  |  | $ 38.35 |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 5,000 |
Remaining authorized shares repurchase amount |  |  |  |  |  |  | $ 3,200 |  |
Cerro Verde |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 325 |  |  |  |  |  |
Unsecured Credit Facility | PT-FI |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Letter of credit |  |  | $ 0 |  | $ 0 |  |  |  |
Debt instrument, term |  |  | 5 years |  |  |  |  |  |
Increase in line of credit |  |  | $ 1,300 |  |  |  |  |  |
Net gain on early extinguishment of debt |  |  | 10 |  |  |  |  |  |
Unsecured Credit Facility | Cerro Verde |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Letter of credit |  |  | 0 |  | 0 |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 350 |  | 350 |  |  |  |
Debt instrument, term |  |  | 5 years |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest costs capitalized |  |  | $ 33 | $ 17 | 59 | $ 32 |  |  |
Line of Credit | Cerro Verde |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  | 0 |  | 0 |  |  |  | 325
Line of Credit | Letter of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Letter of credit |  |  | 8 |  | 8 |  |  |  |
Revolving credit facility, availability |  |  | 1,500 |  | 1,500 |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  | 0 |  | 0 |  |  |  |
Revolving credit facility, availability |  |  | 3,500 |  | 3,500 |  |  |  |
Line of Credit | Revolving Credit Facility | Maturing 2024 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility, availability |  |  | 3,300 |  | 3,300 |  |  |  |
Line of Credit | Revolving Credit Facility | Maturing 2023 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility, availability |  |  | 200 |  | 200 |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal Amount |  |  | 582 |  | 582 |  |  |  |
Net gain on early extinguishment of debt |  |  | (18) |  |  |  |  |  |
Senior Notes | Subsequent event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  | $ 291 |  |
Senior Notes | PT-FI |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 2,976 |  | $ 2,976 |  |  |  | $ 0
Repayments of debt |  | $ 600 |  |  |  |  |  |  |
Principal Amount |  | 3,000 |  |  |  |  |  |  |
Senior Notes | PT-FI | 4.763% Senior Notes Due 2027 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal Amount |  | 750 |  |  |  |  |  |  |
Senior Notes | PT-FI | 5.315% Senior Notes Due 2032 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal Amount |  | 1,500 |  |  |  |  |  |  |
Senior Notes | PT-FI | 6.200% Senior Notes Due 2052 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal Amount |  | $ 750 |  |  |  |  |  |  |

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