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Financial Instruments - Unrealized gains losses (Details) oz in Thousands, lb in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 oz lb | Sep. 30, 2024 USD ($) $ / lb $ / oz $ / lb | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) lb $ / lb $ / oz $ / lb | Sep. 30, 2023 USD ($)
Commodity Contract |  |  |  |  |
Unrealized gains (losses): |  |  |  |  |
Derivative financial instruments |  | $ 12 | $ 2 | $ 22 | $ (9)
Hedged item – firm sales commitments |  | (12) | (2) | (22) | 9
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments |  | 0 | (4) | 29 | (1)
Matured derivative financial instruments |  | $ 0 | (4) | $ 29 | (1)
Commodity Contract | Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  |  |  | 101 |
Derivative, Average Forward Price | $ / lb |  | 4.30 |  | 4.30 |
Forward Contracts | Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  |  |  | 112 |
Derivative, Average Forward Price | $ / lb |  | 4.22 |  | 4.22 |
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments |  | $ (19) | (1) | $ (45) | (3)
Matured derivative financial instruments |  | (19) | (1) | (45) | (3)
Copper | Not Designated as Hedging Instrument |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | $ 29 | (30) | $ 276 | 31
Copper | Short [Member] | Embedded Derivative Financial Instruments | Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 327 |  |  |  |
Derivative, Average Forward Price | $ / lb |  | 4.23 |  | 4.23 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | $ / lb |  | 4.43 |  | 4.43 |
Copper | Long [Member] | Embedded Derivative Financial Instruments | Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 26 |  |  |  |
Derivative, Average Forward Price | $ / lb |  | 4.29 |  | 4.29 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | $ / lb |  | 4.42 |  | 4.42 |
Gold | Short [Member] | Embedded Derivative Financial Instruments | Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 218 |  |  |  |
Derivative, Average Forward Price | $ / oz |  | 2,492 |  | 2,492 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | $ / oz |  | 2,654 |  | 2,654 |
gold and other | Not Designated as Hedging Instrument |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | $ 81 | $ (10) | $ 170 | $ 12

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