Property, Plant and Equipment-Net (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		12 Months Ended
	Apr. 30, 2026	Nov. 30, 2025	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Property, Plant and Equipment-Net
Gross property plant and equipment			$ 15,971		$ 15,818
Less: Accumulated depreciation and amortization			9,247		9,103
Net property, plant and equipment			6,724		6,715
Construction in progress expenditures incurred but not yet paid			138	$ 87	118	$ 101
Depreciation and amortization			227	220
Changes in plant turnaround activity
Asset impairment charges		$ 25
Insurance recoveries			25	0
Subsequent Event
Changes in plant turnaround activity
Initial proceeds from insurance	$ 75
Land
Property, Plant and Equipment-Net
Gross property plant and equipment			108		109
Machinery and equipment
Property, Plant and Equipment-Net
Gross property plant and equipment			14,014		13,957
Changes in plant turnaround activity
Balance at the beginning of the period	$ 455		427	363	363
Additions			69	20
Depreciation			(39)	(37)
Effect of exchange rate changes and other			(2)	(3)
Balance at the end of the period			455	$ 343	427	$ 363
Buildings and improvements
Property, Plant and Equipment-Net
Gross property plant and equipment			1,048		1,043
Construction in progress
Property, Plant and Equipment-Net
Gross property plant and equipment			$ 801		$ 709