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, 2023 USD ($) $ / lb $ / oz $ / lb	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) lb $ / lb $ / oz $ / lb	Sep. 30, 2022 USD ($)
Not Designated as Hedging Instrument | Amounts recorded in Sales
Realized gains (losses):
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net		$ (40)	$ (306)	$ 43	$ (819)
Commodity Contract
Unrealized gains (losses):
Derivative financial instruments		2	17	(9)	(61)
Hedged item – firm sales commitments		(2)	(17)	9	61
Realized gains (losses):
Matured derivative financial instruments		$ (4)	(50)	$ (1)	(48)
Commodity Contract | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb				85
Derivative, Average Forward Price | $ / lb		3.85		3.85
Copper Forward Contracts | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb				19
Derivative, Average Forward Price | $ / lb		3.77		3.77
Realized gains (losses):
Matured derivative financial instruments		$ (1)	5	$ (3)	31
Copper | Not Designated as Hedging Instrument
Realized gains (losses):
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net		$ (30)	(272)	$ 31	(774)
Copper | Short [Member] | Embedded Derivative Financial Instruments | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	553
Derivative, Average Forward Price | $ / lb		3.78		3.78
Realized gains (losses):
Derivative Average Market Price | $ / lb		3.75		3.75
Copper | Long [Member] | Embedded Derivative Financial Instruments | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	165
Derivative, Average Forward Price | $ / lb		3.80		3.80
Realized gains (losses):
Derivative Average Market Price | $ / lb		3.75		3.75
Gold | Short [Member] | Embedded Derivative Financial Instruments | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | oz	209
Derivative, Average Forward Price | $ / oz		1,925		1,925
Realized gains (losses):
Derivative Average Market Price | $ / oz		1,884		1,884
gold and other | Not Designated as Hedging Instrument
Realized gains (losses):
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net		$ (10)	$ (34)	$ 12	$ (45)