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Financial Instruments - Derivative (Details) - USD ($) $ in Millions | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022
Cash and Cash Equivalents [Line Items] |  |  |  |  |
Credit Derivative, Maximum Exposure, Undiscounted |  | $ 135 |  |  |
Cash and cash equivalents |  | 5,000 | $ 4,758 |  |
Restricted cash and cash equivalents |  | 1,117 | 1,208 |  |
Restricted Cash and Cash Equivalents, Noncurrent |  | 99 | 97 |  |
Total cash and cash equivalents and restricted cash and cash equivalents presented in the consolidated statements of cash flows |  | 6,216 | 6,063 | $ 6,539 | $ 8,390
Export Proceeds, Percent | 30.00% |  |  |  |
Bank Time Deposits |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 100 | 300 |  |
Designated for Smelter Development Projects |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |
Total cash and cash equivalents and restricted cash and cash equivalents presented in the consolidated statements of cash flows |  |  | 200 |  |
Designated For Export Proceeds |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |
Restricted cash and cash equivalents |  | 1,000 | 1,100 |  |
Assurance Bonds |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |
Restricted cash and cash equivalents |  | $ 100 | $ 100 |  |

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