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Business Combinations - Summary of Gross Sales and Net Earnings Before Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Agrium Inc [Member]    
Disclosure of detailed information about business combination [Line Items]    
Sales   $ 14,551
Net earnings (loss) before income taxes   546
Retail Acquisitions [Member]    
Disclosure of detailed information about business combination [Line Items]    
Sales $ 312 213
Net earnings (loss) before income taxes (1) $ 10
Ruralco Inc [Member]    
Disclosure of detailed information about business combination [Line Items]    
Sales 249  
Net earnings (loss) before income taxes (2)  
Ruralco Inc [Member] | Revised Fair Value [Member]    
Disclosure of detailed information about business combination [Line Items]    
Sales 1,090  
EBITDA 50  
Other Aquisitions [Member] | Revised Fair Value [Member]    
Disclosure of detailed information about business combination [Line Items]    
Sales 480  
EBITDA $ 40