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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, 2025 USD ($) $ / BTU	Jun. 30, 2024 USD ($) $ / BTU	Dec. 31, 2024 USD ($) $ / BTU	Jun. 30, 2025 EUR (€)	Dec. 31, 2024 EUR (€)	Jun. 30, 2024 EUR (€)
Derivatives, Fair Value
Total asset derivatives	$ 24	$ 11	$ 17
Total liability derivatives	307	137	114
Current derivative asset	24	11	17
Current derivative liability	157	12	12
Noncurrent derivative liability	150	125	102
Derivatives designated as hedging instruments
Derivatives, Fair Value
Total asset derivatives	10	9	15
Total liability derivatives	$ 306	$ 129	$ 104
Derivatives designated as hedging instruments \| Commodity forward contracts and collars
Derivatives, Fair Value
British Thermal Units ("BTUs") \| $ / BTU	9	33	28
Total liability derivatives	$ 1	$ 10	$ 6
Derivatives designated as hedging instruments \| Foreign exchange risk
Derivatives, Fair Value
Notional amount	816	833	816
Total asset derivatives	1	6	8
Total liability derivatives	163	82	69
Derivatives designated as hedging instruments \| Net investment hedges
Derivatives, Fair Value
Notional amount \| €				€ 844	€ 483	€ 483
Total asset derivatives	9	3	7
Total liability derivatives	142	37	29
Derivatives not designated as hedging instruments \| Foreign exchange contracts
Derivatives, Fair Value
Notional amount	506	572	680
Total asset derivatives	14	2	2
Total liability derivatives	$ 1	$ 8	$ 10