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FAIR VALUE MEASUREMENTS (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Feb. 22, 2015
Feb. 22, 2015
May 25, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Goodwill Impairment Charge $ (1,290,000,000)us-gaap_GoodwillImpairmentLoss $ (1,502,100,000)us-gaap_GoodwillImpairmentLoss  
Carrying amount of long-term debt 7,900,000,000us-gaap_LongTermDebt 7,900,000,000us-gaap_LongTermDebt 8,900,000,000us-gaap_LongTermDebt
Long-term debt at fair value 8,500,000,000us-gaap_LongTermDebtFairValue 8,500,000,000us-gaap_LongTermDebtFairValue 9,500,000,000us-gaap_LongTermDebtFairValue
Hedged debt      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Carrying amount of long-term debt     500,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cag_HedgeddebtMember
Private Brands      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Goodwill Impairment Charge (1,290,000,000)us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= cag_PrivateBrandsMember
(1,502,100,000)us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= cag_PrivateBrandsMember
 
Impairment charges $ 13,700,000us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cag_PrivateBrandsMember
$ 43,700,000us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cag_PrivateBrandsMember