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Financial Instruments - Derivative (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 5,745	$ 8,146
Restricted cash and cash equivalents	697	111
Restricted Cash and Cash Equivalents, Noncurrent	97	133
Total cash, cash equivalents and restricted cash and cash equivalents presented in the consolidated statements of cash flows	6,539	8,390	$ 8,824	$ 8,314
Credit Derivative, Maximum Exposure, Undiscounted	16
Bank Time Deposits
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	300	500
Designated for Smelter Development Projects
Cash and Cash Equivalents [Line Items]
Total cash, cash equivalents and restricted cash and cash equivalents presented in the consolidated statements of cash flows	600	$ 1,800
Designated For Export Proceeds
Cash and Cash Equivalents [Line Items]
Restricted cash and cash equivalents	$ 500