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Derivative Instruments - Balance Sheet Classification (Details) € in Millions, $ / BTU in Millions, $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2026 USD ($) $ / BTU	Jun. 30, 2025 USD ($) $ / BTU	Dec. 31, 2025 USD ($) $ / BTU	Jun. 30, 2026 EUR (€)	Dec. 31, 2025 EUR (€)	Jun. 30, 2025 EUR (€)
Derivatives, Fair Value
Total asset derivatives	$ 27	$ 24	$ 14
Total liability derivatives	247	307	287
Current derivative asset	23	24	14
Current derivative liability	62	157	71
Noncurrent derivative asset	4
Noncurrent derivative liability	185	150	216
Derivatives designated as hedging instruments
Derivatives, Fair Value
Total asset derivatives	27	10	12
Total liability derivatives	$ 245	$ 306	$ 287
Derivatives designated as hedging instruments \| Commodity forward contracts and collars
Derivatives, Fair Value
British Thermal Units ("BTUs") \| $ / BTU	32	9	9
Total asset derivatives	$ 15
Total liability derivatives	3	$ 1	$ 2
Derivatives designated as hedging instruments \| Foreign exchange risk
Derivatives, Fair Value
Notional amount	400	816	400
Total asset derivatives	1	1	1
Total liability derivatives	69	163	78
Derivatives designated as hedging instruments \| Net investment hedges
Derivatives, Fair Value
Notional amount \| €				€ 1,176	€ 1,176	€ 844
Total asset derivatives	11	9	11
Total liability derivatives	173	142	207
Derivatives not designated as hedging instruments \| Foreign exchange contracts
Derivatives, Fair Value
Notional amount	294	506	526
Total asset derivatives		14	$ 2
Total liability derivatives	$ 2	$ 1