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Goodwill and Other Intangible Assets (Details) - USD ($)
 12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Goodwill [Line Items]      
Goodwill, Impaired, Accumulated Impairment Loss $ 145,000,000 $ 0  
Summary of changes in the company's goodwill      
Goodwill, Beginning Balance 6,077,100,000 6,091,100,000  
Impairment charge (145,000,000) [1] 0 $ 0
Other [2] 10,100,000 (14,000,000)  
Goodwill, Ending Balance 5,942,200,000 6,077,100,000 6,091,100,000
U.S. Retail Coffee [Member]      
Summary of changes in the company's goodwill      
Goodwill, Beginning Balance 2,090,900,000 2,090,900,000  
Impairment charge [1] 0    
Other [2] 0 0  
Goodwill, Ending Balance 2,090,900,000 2,090,900,000 2,090,900,000
U.S. Retail Consumer Foods [Member]      
Summary of changes in the company's goodwill      
Goodwill, Beginning Balance 1,599,000,000 1,600,900,000  
Impairment charge [1] 0    
Other [2] 1,400,000 (1,900,000)  
Goodwill, Ending Balance 1,600,400,000 1,599,000,000 1,600,900,000
U.S. Retail Pet Foods [Member]      
Summary of changes in the company's goodwill      
Goodwill, Beginning Balance 1,969,500,000 1,969,500,000  
Impairment charge [1] (145,000,000)    
Other [2] 0 0  
Goodwill, Ending Balance 1,824,500,000 1,969,500,000 1,969,500,000
International and Away From Home [Member]      
Summary of changes in the company's goodwill      
Goodwill, Beginning Balance 417,700,000 429,800,000  
Impairment charge [1] 0    
Other [2] 8,700,000 (12,100,000)  
Goodwill, Ending Balance $ 426,400,000 $ 417,700,000 $ 429,800,000
[1] There have been no goodwill impairment charges recognized in prior periods.
[2] The amounts classified as other represent foreign currency exchange adjustments.