Derivative Instruments - Balance Sheet Classification (Details) € in Millions, $ / BTU in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2025 USD ($) $ / BTU	Mar. 31, 2024 USD ($) $ / BTU	Dec. 31, 2024 USD ($) $ / BTU	Mar. 31, 2025 EUR (€)	Dec. 31, 2024 EUR (€)	Mar. 31, 2024 EUR (€)
Derivatives, Fair Value
Total asset derivatives	$ 25	$ 10	$ 17
Total liability derivatives	178	157	114
Current derivative asset	25	10	17
Current derivative liability	60	17	12
Noncurrent derivative liability	118	140	102
Derivatives designated as hedging instruments
Derivatives, Fair Value
Total asset derivatives	15	9	15
Total liability derivatives	$ 165	$ 148	$ 104
Derivatives designated as hedging instruments | Commodity forward contracts and collars
Derivatives, Fair Value
British Thermal Units ("BTUs") | $ / BTU	8	35	28
Total asset derivatives	$ 1
Total liability derivatives	2	$ 15	$ 6
Derivatives designated as hedging instruments | Foreign exchange risk
Derivatives, Fair Value
Notional amount	816	833	816
Total asset derivatives	3	6	8
Total liability derivatives	90	92	69
Derivatives designated as hedging instruments | Net investment hedges
Derivatives, Fair Value
Notional amount | €				€ 969	€ 483	€ 483
Total asset derivatives	11	3	7
Total liability derivatives	73	41	29
Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivatives, Fair Value
Notional amount	957	453	680
Total asset derivatives	10	1	2
Total liability derivatives	$ 13	$ 9	$ 10