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Derivative Instruments - Balance Sheet Classification (Details) € in Millions, $ / BTU in Millions, $ in Millions	3 Months Ended	9 Months Ended		12 Months Ended
	Jun. 30, 2025 USD ($)	Sep. 30, 2025 USD ($) $ / BTU	Sep. 30, 2024 USD ($) $ / BTU	Dec. 31, 2024 USD ($) $ / BTU	Sep. 30, 2025 EUR (€)	Dec. 31, 2024 EUR (€)	Sep. 30, 2024 EUR (€)
Derivatives, Fair Value
Total asset derivatives		$ 27	$ 17	$ 17
Total liability derivatives		292	188	114
Current derivative asset		27	17	17
Current derivative liability		74	12	12
Noncurrent derivative liability		218	176	102
Derivatives designated as hedging instruments
Derivatives, Fair Value
Total asset derivatives		13	6	15
Total liability derivatives		$ 289	$ 185	$ 104
Derivatives designated as hedging instruments \| Commodity forward contracts and collars
Derivatives, Fair Value
British Thermal Units ("BTUs") \| $ / BTU		8	30	28
Total liability derivatives		$ 1	$ 10	$ 6
Derivatives designated as hedging instruments \| Foreign exchange risk
Derivatives, Fair Value
Notional amount		400	833	816
Total asset derivatives		2	4	8
Total liability derivatives		80	118	69
Derivatives designated as hedging instruments \| Net investment hedges
Derivatives, Fair Value
Notional amount \| €					€ 1,176	€ 483	€ 483
Total asset derivatives		11	2	7
Total liability derivatives		208	57	29
Derivatives not designated as hedging instruments \| Foreign exchange contracts
Derivatives, Fair Value
Notional amount		544	628	680
Total asset derivatives		14	11	2
Total liability derivatives		$ 3	$ 3	$ 10
Net investment hedges
Derivatives, Fair Value
Payments for derivative instruments, financing activities	$ 6