Financial Instruments, Risk Management Activities, and Fair Values (Details) (USD $)	12 Months Ended
	May 29, 2011	May 30, 2010	May 31, 2009
Schedule Of Available For Sale Securities [Line Items]
Cost	$ 10,900,000	$ 17,900,000
Market Value	15,000,000	27,400,000
Gross Gains	4,100,000	9,500,000
Gross Loss	0	0
Financial Instruments Owned At Fair Value [Abstract]
Marketable Securities Pledged as Collateral	2,300,000
Long Term Debt Fair value	7,164,500,000
Long Term Debt	6,573,800,000	5,375,800,000
Interest Rate Derivatives [Line Items]
Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income	48,400,000
Extinguishment Of Debt Amount		400,000,000
Notional Amount Of Cash Settled Pay Floating Swaps	1,600,000,000
Notional Amount Of Cash Settled Pay Fixed Swaps	1,600,000,000
Commodity Price Risk [Abstract]
Net gain (loss) on mark-to-market valuation of commodity positions	160,300,000	(54,700,000)	(249,600,000)
Net (gain) loss on commodity positions reclassified from unallocated corporate items to segment operating profit	(93,600,000)	55,700,000	134,800,000
Net mark-to-market revaluation of certain grain inventories	28,500,000	(8,100,000)	(4,100,000)
Net mark-to-market valuation of certain commodity positions recognized in unallocated corporate items	95,200,000	(7,100,000)	(118,900,000)
Notional Amount Of Commodity Derivatives	347,500,000
Notional Amount Of Agricultural Commodity Derivatives	160,700,000
Notional Amount Of Energy Commodity Derivatives	186,800,000
Derivative Contacts Inputs Average Period Of Utilization	These contracts relate to inputs that generally will be utilized within the next 12 months.
Interest Rate Risk [Abstract]
Pay-floating swaps - notional amount	838,000,000	2,155,600,000
Average receive rate	1.80%	4.80%
Average pay rate	0.20%	0.30%
Pay-fixed swaps - notional amount	0	1,600,000,000
Average receive rate	0.00%	0.30%
Average pay rate	0.00%	7.30%
Interest Rate Cash Flow Hedge Ineffectiveness Is Immaterial	The amount of hedge ineffectiveness was less than $1 million in each of fiscal 2011, 2010 and 2009.
Interest Rate Fair Value Hedges Ineffectiveness Is Immaterial	The amount of hedge ineffectiveness was less than $1 million in each of fiscal 2011, 2010 and 2009.
Foreign Currency Derivatives [Abstract]
Notional Amount Of Foreign Currency Derivatives	2,436,500,000
Foreign Currency Cash Flow Hedge Ineffectiveness Is Immaterial	0.3
Deferred Net Foreign Currency Transaction Gains Losses AfterTax Accumulated Other Comprehensive Income	(95,700,000)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Designated As Hedging Instrument Fair Value	21,300,000	14,400,000
Derivative Asset Not Designated As Hedging Instrument Fair Value	151,300,000	153,100,000
Other Assets Fair Value Disclosure	15,000,000	27,800,000
Total Assets Fair Value Disclosure	187,600,000	195,300,000
Derivative Liability Designated As Hedging Instrument Fair Value	(36,200,000)	(29,600,000)
Derivative Liability Not Designated As Hedging Instrument Fair Value	(49,800,000)	(182,700,000)
Other Liabilities Fair Value Disclosure	0	0
Total Liabilities Fair Value Disclosure	(86,000,000)	(212,300,000)
Impairment Of Long Lived Assets To Be Disposed Of		6,600,000
Property Plant And Equipment Fair Value Disclosure		400,000
Assets Held For Sale Property Plant And Equipment		7,000,000
Amounts Recorded In Accumulated Other Comprehensive Loss [Abstract]
Unrealized Losses From Interest Rate Cash Flow Hedges Recorded In AOCI After Tax	30,000,000
Unrealized Losses From Foreign Currency Cash Flow Hedges Recorded in AOCI After Tax	5,800,000
Net Pre-tax Gains And Losses in AOCI Expected To Be Reclassified Into Net Earnings Within The Next 12 Months	11,700,000
Credit Risk Related Contingent Features [Abstract]
Derivative Net Liability Position Aggregate Fair Value	6,300,000
Additional Collateral Aggregate Fair Value	6,300,000
Counterparty Credit Risk [Abstract]
Concentration Risk Credit Risk Financial Instrument Maximum Exposure	63,100,000
Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	8,900,000	11,800,000
Market Value	9,000,000	11,900,000
Gross Gains	100,000	100,000
Gross Loss	0	0
Equity [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	2,000,000	6,100,000
Market Value	6,000,000	15,500,000
Gross Gains	4,000,000	9,400,000
Gross Loss	0	0
Available For Sale Securities Debt Maturities Within One Year [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	2,700,000
Market Value	2,700,000
Available For Sale Securities Debt Maturities After One Through Three Years [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	700,000
Market Value	700,000
Available For Sale Securities Debt Maturities After Three Through Seven Years [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	5,200,000
Market Value	5,300,000
Available For Sale Securities Debt Maturities After Seven Years [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	300,000
Market Value	300,000
500 Million [Member]
Interest Rate Derivatives [Line Items]
Derivative Notional Amount		500,000,000
Derivative Average Fixed Interest Rate		4.30%
Payments For Proceeds From Hedge Financing Activities	17,100,000
Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income	16,200,000
Debt Instrument Face Amount	500,000,000
Debt Instrument Maturity Date Description	30-year
700 Million Fiscal 2010 [Member]
Interest Rate Derivatives [Line Items]
Derivative Notional Amount		700,000,000
Interest Rate Stated Percentage		5.65%
Payments For Proceeds From Hedge Financing Activities	(2,700,000)
Debt Instrument Face Amount		700,000,000
Extinguishment Of Debt Amount		179,200,000
Extinguished Of Debt Interest Rate		5.65%
7.1 Billion [Member]
Interest Rate Derivatives [Line Items]
Derivative Notional Amount	7,100,000,000
Payments For Proceeds From Hedge Financing Activities	22,300,000
Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income	500,000
1 Billion Fiscal 2007 [Member]
Interest Rate Derivatives [Line Items]
Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income	12,700,000
300 Million [Member]
Interest Rate Derivatives [Line Items]
Derivative Notional Amount	300,000,000
Interest Rate Stated Percentage	1.55%
500 Million Fiscal 2011 Member
Interest Rate Derivatives [Line Items]
Derivative Notional Amount	500,000,000	0
Derivative Average Fixed Interest Rate	3.90%
Interest Rate Swap Floating [Member]
Derivative [Line Items]
2012	3,400,000
2013	534,600,000
2014	300,000,000
Interest Rate Swap Fixed [Member]
Derivative [Line Items]
2012	500,000,000
2013	0
2014	0
Level 1 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Designated As Hedging Instrument Fair Value	0	0
Derivative Asset Not Designated As Hedging Instrument Fair Value	14,600,000	0
Other Assets Fair Value Disclosure	5,900,000	15,500,000
Total Assets Fair Value Disclosure	20,500,000	15,500,000
Derivative Liability Designated As Hedging Instrument Fair Value	0	0
Derivative Liability Not Designated As Hedging Instrument Fair Value	0	(5,600,000)
Other Liabilities Fair Value Disclosure	0	0
Total Liabilities Fair Value Disclosure	0	(5,600,000)
Level 1 [Member] | Interest Rate Contract
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Designated As Hedging Instrument Fair Value	0	0
Derivative Asset Not Designated As Hedging Instrument Fair Value	0	0
Derivative Liability Designated As Hedging Instrument Fair Value	0	0
Derivative Liability Not Designated As Hedging Instrument Fair Value	0	0
Level 1 [Member] | Foreign Exchange Contract
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Designated As Hedging Instrument Fair Value	0	0
Derivative Asset Not Designated As Hedging Instrument Fair Value	0	0
Derivative Liability Designated As Hedging Instrument Fair Value	0	0
Derivative Liability Not Designated As Hedging Instrument Fair Value	0	0
Level 1 [Member] | Commodity Contract
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Not Designated As Hedging Instrument Fair Value	14,600,000	0
Derivative Liability Not Designated As Hedging Instrument Fair Value	0	(5,600,000)
Level 1 [Member] | Marketable Investments [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets Fair Value Disclosure	5,900,000	15,500,000
Other Liabilities Fair Value Disclosure	0	0
Level 1 [Member] | Grain Contracts [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Not Designated As Hedging Instrument Fair Value	0	0
Derivative Liability Not Designated As Hedging Instrument Fair Value	0	0
Level 1 [Member] | Long Lived Assets [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets Fair Value Disclosure		0
Other Liabilities Fair Value Disclosure		0
Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Designated As Hedging Instrument Fair Value	21,300,000	14,400,000
Derivative Asset Not Designated As Hedging Instrument Fair Value	136,700,000	153,100,000
Other Assets Fair Value Disclosure	9,100,000	12,300,000
Total Assets Fair Value Disclosure	167,100,000	179,800,000
Derivative Liability Designated As Hedging Instrument Fair Value	(36,200,000)	(29,600,000)
Derivative Liability Not Designated As Hedging Instrument Fair Value	(49,800,000)	(177,100,000)
Other Liabilities Fair Value Disclosure	0	0
Total Liabilities Fair Value Disclosure	(86,000,000)	(206,700,000)
Level 2 [Member] | Interest Rate Contract
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Designated As Hedging Instrument Fair Value	11,200,000	5,800,000
Derivative Asset Not Designated As Hedging Instrument Fair Value	2,200,000	124,300,000
Derivative Liability Designated As Hedging Instrument Fair Value	(21,300,000)	(17,100,000)
Derivative Liability Not Designated As Hedging Instrument Fair Value	(900,000)	(163,100,000)
Level 2 [Member] | Foreign Exchange Contract
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Designated As Hedging Instrument Fair Value	10,100,000	8,600,000
Derivative Asset Not Designated As Hedging Instrument Fair Value	57,100,000	9,500,000
Derivative Liability Designated As Hedging Instrument Fair Value	(14,900,000)	(12,500,000)
Derivative Liability Not Designated As Hedging Instrument Fair Value	(19,900,000)	(1,000,000)
Level 2 [Member] | Commodity Contract
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Not Designated As Hedging Instrument Fair Value	16,300,000	7,400,000
Derivative Liability Not Designated As Hedging Instrument Fair Value	0	0
Level 2 [Member] | Marketable Investments [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets Fair Value Disclosure	9,100,000	11,900,000
Other Liabilities Fair Value Disclosure	0	0
Level 2 [Member] | Grain Contracts [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Not Designated As Hedging Instrument Fair Value	61,100,000	11,900,000
Derivative Liability Not Designated As Hedging Instrument Fair Value	(29,000,000)	(13,000,000)
Level 2 [Member] | Long Lived Assets [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets Fair Value Disclosure		400,000
Other Liabilities Fair Value Disclosure		0
Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Designated As Hedging Instrument Fair Value	0	0
Derivative Asset Not Designated As Hedging Instrument Fair Value	0	0
Other Assets Fair Value Disclosure	0	0
Total Assets Fair Value Disclosure	0	0
Derivative Liability Designated As Hedging Instrument Fair Value	0	0
Derivative Liability Not Designated As Hedging Instrument Fair Value	0	0
Other Liabilities Fair Value Disclosure	0	0
Total Liabilities Fair Value Disclosure	0	0
Level 3 [Member] | Interest Rate Contract
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Designated As Hedging Instrument Fair Value	0	0
Derivative Asset Not Designated As Hedging Instrument Fair Value	0	0
Derivative Liability Designated As Hedging Instrument Fair Value	0	0
Derivative Liability Not Designated As Hedging Instrument Fair Value	0	0
Level 3 [Member] | Foreign Exchange Contract
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Designated As Hedging Instrument Fair Value	0	0
Derivative Asset Not Designated As Hedging Instrument Fair Value	0	0
Derivative Liability Designated As Hedging Instrument Fair Value	0	0
Derivative Liability Not Designated As Hedging Instrument Fair Value	0	0
Level 3 [Member] | Commodity Contract
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Not Designated As Hedging Instrument Fair Value	0	0
Derivative Liability Not Designated As Hedging Instrument Fair Value	0	0
Level 3 [Member] | Marketable Investments [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets Fair Value Disclosure	0	0
Other Liabilities Fair Value Disclosure	0	0
Level 3 [Member] | Grain Contracts [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Not Designated As Hedging Instrument Fair Value	0	0
Derivative Liability Not Designated As Hedging Instrument Fair Value	0	0
Level 3 [Member] | Long Lived Assets [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets Fair Value Disclosure		0
Other Liabilities Fair Value Disclosure		0
Interest Rate Contract | Cash Flow Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in other comprehensive income (OCI)	(20,900,000)	(11,700,000)
Amount of gain (loss) reclassified from AOCI into earnings	(13,100,000)	(18,000,000)
Amount of gain (loss) recognized in earnings	(400,000)	(300,000)
Interest Rate Contract | Fair Value Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in earnings	300,000	200,000
Interest Rate Contract | Not Designated as Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in earnings	1,000,000	200,000
Interest Rate Contract
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Designated As Hedging Instrument Fair Value	11,200,000	5,800,000
Derivative Asset Not Designated As Hedging Instrument Fair Value	2,200,000	124,300,000
Derivative Liability Designated As Hedging Instrument Fair Value	(21,300,000)	(17,100,000)
Derivative Liability Not Designated As Hedging Instrument Fair Value	(900,000)	(163,100,000)
Foreign Exchange Contract | Cash Flow Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in other comprehensive income (OCI)	(18,900,000)	(13,300,000)
Amount of gain (loss) reclassified from AOCI into earnings	(16,700,000)	(26,400,000)
Amount of gain (loss) recognized in earnings	300,000	(500,000)
Foreign Exchange Contract | Fair Value Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in earnings	0	0
Foreign Exchange Contract | Not Designated as Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in earnings	23,700,000	13,300,000
Foreign Exchange Contract
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Designated As Hedging Instrument Fair Value	10,100,000	8,600,000
Derivative Asset Not Designated As Hedging Instrument Fair Value	57,100,000	9,500,000
Derivative Liability Designated As Hedging Instrument Fair Value	(14,900,000)	(12,500,000)
Derivative Liability Not Designated As Hedging Instrument Fair Value	(19,900,000)	(1,000,000)
Commodity Contract | Cash Flow Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in other comprehensive income (OCI)	0	0
Amount of gain (loss) reclassified from AOCI into earnings	0	0
Amount of gain (loss) recognized in earnings	0	0
Commodity Contract | Fair Value Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in earnings	0	0
Commodity Contract | Not Designated as Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in earnings	160,300,000	(54,700,000)
Commodity Contract
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Not Designated As Hedging Instrument Fair Value	30,900,000	7,400,000
Derivative Liability Not Designated As Hedging Instrument Fair Value	0	(5,600,000)
Marketable Investments [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets Fair Value Disclosure	15,000,000	27,400,000
Other Liabilities Fair Value Disclosure	0	0
Grain Contracts [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset Not Designated As Hedging Instrument Fair Value	61,100,000	11,900,000
Derivative Liability Not Designated As Hedging Instrument Fair Value	(29,000,000)	(13,000,000)
Long Lived Assets [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets Fair Value Disclosure		400,000
Other Liabilities Fair Value Disclosure		0
Equity Contract [Member] | Cash Flow Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in other comprehensive income (OCI)	0	0
Amount of gain (loss) reclassified from AOCI into earnings	0	0
Amount of gain (loss) recognized in earnings	0	0
Equity Contract [Member] | Fair Value Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in earnings	0	0
Equity Contract [Member] | Not Designated as Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in earnings	0	200,000
Cash Flow Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in other comprehensive income (OCI)	(39,800,000)	(25,000,000)
Amount of gain (loss) reclassified from AOCI into earnings	(29,800,000)	(44,400,000)
Amount of gain (loss) recognized in earnings	(100,000)	(800,000)
Fair Value Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in earnings	300,000	200,000
Not Designated as Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in earnings	$ 185,000,000	$ (41,000,000)
Customer Concentration Risk WalMart Consolidated Member
Counterparty Credit Risk [Abstract]
Concentration Risk Percentage	23.00%
Customer Concentration Risk WalMart USRO Member
Counterparty Credit Risk [Abstract]
Concentration Risk Percentage	30.00%
Customer Concentration Risk WalMart International Member
Counterparty Credit Risk [Abstract]
Concentration Risk Percentage	6.00%
Customer Concentration Risk WalMart BFS Member
Counterparty Credit Risk [Abstract]
Concentration Risk Percentage	7.00%
Customer Concentration Risk Five Largest USRO Member
Counterparty Credit Risk [Abstract]
Concentration Risk Percentage	53.00%
Customer Concentration Risk Five Largest International Member
Counterparty Credit Risk [Abstract]
Concentration Risk Percentage	24.00%
Customer Concentration Risk Five Largest BFS Member
Counterparty Credit Risk [Abstract]
Concentration Risk Percentage	45.00%
Credit Concentration Risk Walmart USRO Member
Counterparty Credit Risk [Abstract]
Concentration Risk Percentage	26.00%
Credit Concentration Risk Walmart International Member
Counterparty Credit Risk [Abstract]
Concentration Risk Percentage	5.00%
Credit Concentration Risk Walmart BFS Member
Counterparty Credit Risk [Abstract]
Concentration Risk Percentage	9.00%