Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2025

Fair Value Disclosures [Abstract]

Schedule of Fair Value Measurements of Asset and Liability Instruments

The carrying amounts of derivative instruments and environmental credit obligations at September 30, 2025 and December 31, 2024 were as follows:

			Fair Value by Input Level
	Carrying Amount		Level 1		Level 2		Level 3
	(In millions)
September 30, 2025
Assets:
Commodity price swaps	$	2	$	—	$	—	$	2
Commodity forward contracts	1		—		1		—
Foreign currency forward contracts	3		—		3		—
Total assets	$	6	$	—	$	4	$	2
Liabilities:
Commodity price swaps	$	1	$	—	$	1	$	—
Commodity forward contracts	1		—		1		—
Foreign currency forward contracts	4		—		4		—
Environmental credit obligations	73		—		73		—
Total liabilities	$	79	$	—	$	79	$	—

			Fair Value by Input Level
	Carrying Amount		Level 1		Level 2		Level 3
	(In millions)
December 31, 2024
Assets:
Commodity forward contracts	$	1	$	—	$	1	$	—
Foreign currency forward contracts	18		—		18		—
Total assets	$	19	$	—	$	19	$	—
Liabilities:
NYMEX futures contracts	$	1	$	1	$	—	$	—
Commodity forward contracts	1		—		1		—
Environmental credit obligations	10		—		10		—
Total liabilities	$	12	$	1	$	11	$	—