Share Repurchases (Details) (USD $)
3 Months Ended 4 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jul. 30, 2014
Feb. 28, 2014
May 25, 2011
Share Repurchases [Line Items]          
Former percentage ownership by Cargill and certain of its subsidiaries         64.00%
Former shares owned by Cargill and certain of Its subsidiaries         285,800,000
Payments for repurchase of common stock $ 134,400,000 $ 1,677,900,000      
Number Of Trading Days To Calculate Weighted Average Trading Price   20 days      
Stock Repurchase Program, Authorized Amount       1,000,000,000  
Repurchase Program [Member]          
Share Repurchases [Line Items]          
Stock repurchase program, remaining authorized repurchase amount 149,400,000        
Common Class A, Series A-2 [Member] | MAC Trusts Share Repurchase Agreement [Member]          
Share Repurchases [Line Items]          
Stock repurchased and retired (shares)   6,184,858 15,462,150    
Common Class A, Series A-3 [Member] | MAC Trusts Share Repurchase Agreement [Member]          
Share Repurchases [Line Items]          
Stock repurchased and retired (shares)   21,647,007      
Common Class A [Member] | MAC Trusts [Member]          
Share Repurchases [Line Items]          
Number of Class A Shares owned by MAC Trusts 0        
Common Class A [Member] | MAC Trusts Share Repurchase Agreement [Member]          
Share Repurchases [Line Items]          
Payments for repurchase of common stock   1,300,000,000 700,000,000    
Common Class A [Member] | Family Trusts Share Repurchase Program [Member]          
Share Repurchases [Line Items]          
Stock repurchased and retired (shares)   8,200,000      
Payments for repurchase of common stock   387,300,000      
No Class Common Stock [Member] | Repurchase Program [Member]          
Share Repurchases [Line Items]          
Stock repurchased and retired (shares) 2,560,277        
Payments for repurchase of common stock $ 123,300,000