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Notes Payable and Long-Term Debt - Footnote Narrative (Details)
1 Months Ended 3 Months Ended 39 Months Ended
Dec. 31, 2015
USD ($)
bank
Nov. 30, 2015
USD ($)
Nov. 30, 2015
USD ($)
occurrence
Aug. 31, 2015
USD ($)
Debt Instrument [Line Items]        
Notes payable   $ 1,694,363,000 $ 1,694,363,000 $ 1,165,378,000
CHS Capital notes payable        
Debt Instrument [Line Items]        
Notes payable   510,123,000 510,123,000 351,661,000
Notes payable        
Debt Instrument [Line Items]        
Notes payable   1,184,240,000 1,184,240,000 813,717,000
Five-Year Revolving Facilities [Member] | Line of Credit [Member] | Revolving credit facility        
Debt Instrument [Line Items]        
Line of Credit Facility, Current Borrowing Capacity   3,000,000,000 3,000,000,000  
Long-term Line of Credit   $ 450,000,000 $ 450,000,000 $ 0
Debt Instrument, Term   5 years    
Committed Term Loans, September 2015 [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Term     10 years  
Debt Instrument, Face Amount   $ 600,000,000 $ 600,000,000  
Debt Instrument, Withdrawal Occurrences During One Year Period | occurrence     10  
Long-term Debt   $ 0 $ 0  
Bilateral, Uncommitted Revolving Facilities [Member] | Line of Credit [Member] | Revolving credit facility        
Debt Instrument [Line Items]        
Line of Credit Facility, Current Borrowing Capacity $ 1,300,000,000      
Line Of Credit Facility, Number Of Programs | bank 3      
Short-term Debt $ 150,000,000      
Minimum [Member] | Bilateral, Uncommitted Revolving Facilities [Member] | Line of Credit [Member] | Revolving credit facility        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 0.25%      
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Committed Term Loans, September 2015 [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate     1.50%  
Minimum [Member] | Base Rate [Member] | Committed Term Loans, September 2015 [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate     0.50%  
Maximum [Member] | Bilateral, Uncommitted Revolving Facilities [Member] | Line of Credit [Member] | Revolving credit facility        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 1.00%      
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Committed Term Loans, September 2015 [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate     2.00%  
Maximum [Member] | Base Rate [Member] | Committed Term Loans, September 2015 [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate     1.00%