Derivative Instruments - Balance Sheet Classification (Details) € in Millions, $ / BTU in Millions, $ in Millions, $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2024 USD ($) $ / BTU	Jun. 30, 2023 USD ($) $ / BTU	Dec. 31, 2023 USD ($) $ / BTU	Jun. 30, 2024 MXN ($)	Jun. 30, 2024 EUR (€)	Dec. 31, 2023 MXN ($)	Dec. 31, 2023 EUR (€)	Jun. 30, 2023 MXN ($)	Jun. 30, 2023 EUR (€)
Derivatives, Fair Value
Total asset derivatives	$ 11	$ 26	$ 13
Total liability derivatives	137	171	190
Current derivative asset	11	26	13
Current derivative liability	12	18	17
Noncurrent derivative liability	125	153	173
Derivatives designated as hedging instruments
Derivatives, Fair Value
Total asset derivatives	9	25	8
Total liability derivatives	$ 129	$ 164	$ 181
Derivatives designated as hedging instruments | Commodity forward contracts and collars
Derivatives, Fair Value
British Thermal Units ("BTUs") | $ / BTU	33	43	38
Total liability derivatives	$ 10	$ 18	$ 14
Derivatives designated as hedging instruments | Foreign exchange risk
Derivatives, Fair Value
Notional amount	833	844	833
Total asset derivatives	6	17	4
Total liability derivatives	82	98	111
Derivatives designated as hedging instruments | Cash flow hedges of foreign exchange risk
Derivatives, Fair Value
Notional amount				$ 0		$ 0		$ 477
Total liability derivatives		3
Derivatives designated as hedging instruments | Net investment hedges
Derivatives, Fair Value
Notional amount | €					€ 483		€ 483		€ 483
Total asset derivatives	3	8	4
Total liability derivatives	37	45	56
Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivatives, Fair Value
Notional amount	572	417	407
Total asset derivatives	2	1	5
Total liability derivatives	$ 8	$ 7	$ 9