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Financing Agreements (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Sep. 04, 2025
Oct. 26, 2023
Jul. 29, 2016
Financing agreements            
Long-term Debt, Gross $ 3,250,000,000 $ 3,000,000,000        
Unsecured Debt [Abstract]            
Long-term debt 3,215,000,000 2,971,000,000        
Long-term debt 3,215,000,000 2,971,000,000        
Loss on debt extinguishment 6,000,000 0 $ 0      
CF Industries            
Unsecured Debt [Abstract]            
Debt Instrument, Unamortized Discount 5,000,000 6,000,000        
Unamortized Debt Issuance Expense 30,000,000 $ 23,000,000        
CF Industries | Senior Credit Agreement            
Debt Instruments            
Available credit 750,000,000          
Line of credit facility, amount outstanding 0          
Letters of credit outstanding, amount $ 0          
Senior Notes | CF Industries | 5.150% due 2034            
Financing agreements            
Debt Instrument, Interest Rate, Effective Percentage 5.15% 5.15%        
Long-term Debt, Gross $ 750,000,000 $ 750,000,000        
Unsecured Debt [Abstract]            
Long-term debt $ 743,000,000 $ 742,000,000        
Debt Instrument, Interest Rate, Effective Percentage 5.293% 5.293%        
Senior Notes | CF Industries | 4.950% due 2043            
Financing agreements            
Debt Instrument, Interest Rate, Effective Percentage 4.95% 4.95%        
Long-term Debt, Gross $ 750,000,000 $ 750,000,000        
Unsecured Debt [Abstract]            
Long-term debt $ 742,000,000 $ 742,000,000        
Debt Instrument, Interest Rate, Effective Percentage 5.04% 5.04%        
Senior Notes | CF Industries | 5.375% due 2044            
Financing agreements            
Debt Instrument, Interest Rate, Effective Percentage 5.375% 5.375%        
Long-term Debt, Gross $ 750,000,000 $ 750,000,000        
Unsecured Debt [Abstract]            
Long-term debt $ 741,000,000 $ 741,000,000        
Debt Instrument, Interest Rate, Effective Percentage 5.478% 5.478%        
Senior Notes | CF Industries | 4.500% due December 2026(2)            
Financing agreements            
Debt Instrument, Interest Rate, Effective Percentage 4.50% 4.50%        
Long-term Debt, Gross $ 0 $ 750,000,000        
Unsecured Debt [Abstract]            
Long-term debt 0 $ 746,000,000        
Loss on debt extinguishment $ (6,000,000)          
Debt Instrument, Interest Rate, Effective Percentage 4.783% 4.783%        
Extinguishment of Debt, Amount $ 756,000,000          
Interest Payable 2,000,000          
Payment for Debt Extinguishment or Debt Prepayment Cost $ 4,000,000          
Senior Notes | CF Industries | Senior Notes 5.300 Percent Due 2035            
Financing agreements            
Debt Instrument, Interest Rate, Effective Percentage 5.30% 5.30%        
Long-term Debt, Gross $ 1,000,000,000 $ 0        
Unsecured Debt [Abstract]            
Long-term debt $ 989,000,000 $ 0        
Debt Instrument, Interest Rate, Effective Percentage 5.444% 5.444%        
Revolving Credit Facility | Line of Credit | CF Industries | Amendment No. 4 to the Third Amended and Restated Revolving Credit Agreement            
Debt Instruments            
Maximum borrowing capacity         $ 750,000,000  
Letter of Credit | Line of Credit            
Debt Instruments            
Maximum borrowing capacity $ 425,000,000          
Unsecured Debt [Abstract]            
Line of Credit Facility, Fair Value of Amount Outstanding $ 339,000,000          
Letter of Credit | Line of Credit | CF Industries | July 2016 Credit Agreement Amendment            
Debt Instruments            
Maximum borrowing capacity           $ 125,000,000
Swingline loan | Line of Credit | CF Industries            
Debt Instruments            
Maximum borrowing capacity       $ 75,000,000