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Financial Instruments - Unrealized gains losses (Details) oz in Thousands, lb in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 oz lb | Jun. 30, 2025 USD ($) $ / lb $ / lb $ / oz | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) lb $ / lb $ / lb $ / oz | Jun. 30, 2024 USD ($)
Commodity Contract |  |  |  |  |
Unrealized gains (losses): |  |  |  |  |
Derivative financial instruments |  | $ (14) | $ 1 | $ 67 | $ 10
Hedged item – firm sales commitments |  | 14 | (1) | (67) | (10)
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments |  | 10 | 28 | 30 | 29
Matured derivative financial instruments |  | $ 10 | 28 | $ 30 | 29
Commodity Contract | Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  |  |  | 109 |
Derivative, Average Forward Price | $ / lb |  | 4.75 |  | 4.75 |
Forward Contracts | Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  |  |  | 53 |
Derivative, Average Forward Price | $ / lb |  | 4.47 |  | 4.47 |
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments |  | $ (2) | (17) | $ (40) | (26)
Matured derivative financial instruments |  | (2) | (17) | (40) | (26)
Copper | Not Designated as Hedging Instrument |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | $ 34 | 181 | $ 150 | 247
Copper | Short [Member] | Embedded Derivative Financial Instruments | Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 440 |  |  |  |
Derivative, Average Forward Price | $ / lb |  | 4.34 |  | 4.34 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | $ / lb |  | 4.49 |  | 4.49 |
Copper | Long [Member] | Embedded Derivative Financial Instruments | Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 107 |  |  |  |
Derivative, Average Forward Price | $ / lb |  | 4.36 |  | 4.36 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | $ / lb |  | 4.49 |  | 4.49 |
Gold | Short [Member] | Embedded Derivative Financial Instruments | Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 81 |  |  |  |
Derivative, Average Forward Price | $ / oz |  | 3,334 |  | 3,334 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | $ / oz |  | 3,297 |  | 3,297 |
gold and other | Not Designated as Hedging Instrument |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | $ 22 | $ 45 | $ 60 | $ 89

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