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Financing Agreements - Narrative (Details) - USD ($)	Sep. 30, 2025	Sep. 04, 2025	Dec. 31, 2024
Letter of Credit \| Letter of Credit
Financing agreements
Maximum borrowing capacity	$ 425,000,000
Line of Credit Facility, Fair Value of Amount Outstanding	334,000,000
CF Industries \| Letter of Credit \| Revolving Credit Facility
Financing agreements
Maximum borrowing capacity		$ 750,000,000
CF Industries \| Letter of Credit \| Letter of Credit
Financing agreements
Maximum borrowing capacity		125,000,000
CF Industries \| Letter of Credit \| Swingline loan
Financing agreements
Maximum borrowing capacity		$ 75,000,000
CF Industries \| Credit Agreement
Financing agreements
Available credit	750,000,000
Outstanding letters of credit	0
Long-term Line of Credit	$ 0		$ 0