Revenue Recognition - Narrative (Details) T in Thousands, $ in Millions		3 Months Ended
	Dec. 01, 2023 USD ($) T	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)
Disaggregation of Revenue [Line Items]
Customer advances		$ 132		$ 77
Revenue, Performance Obligation, description of returns and other similar obligations, unfulfilled minimum contractual right of payment		1,200
Depreciation and amortization		228	$ 221
Supply contract liability		686		$ 694
Contract with Customer, Liability, Revenue Recognized		55	93
Waggaman Ammonia Production Facility | Supply Agreements
Disaggregation of Revenue [Line Items]
Intangible Asset, Finite-Lived, Acquired, Weighted-Average Amortization Period	25 years
Waggaman Ammonia Production Facility
Disaggregation of Revenue [Line Items]
Business Combination, Long Term Supply Commitment Acquired, Committed Annual Amount | T	200
Business Combination, Recognized Liability Assumed, Contingent Liability	$ 757
Waggaman Ammonia Production Facility | Supply Contracts
Disaggregation of Revenue [Line Items]
Depreciation and amortization		8	$ 7
Remainder of 2026		22
2027		30
2028		30
2029		30
2030		30
2031		$ 30