Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Feb. 26, 2012	May 29, 2011
Derivative assets and liabilities and amounts representing a right to reclaim cash collateral or obligation to return cash collateral were reflected in balance sheets:
Prepaid expenses and other current assets	$ 76.8	$ 71.5
Other accrued liabilities	146.0	92.2
Schedule of Derivative Instruments in Statement of Financial Position, gross, fair value
Total derivative assets not designated as hedging instruments	83.5	87.1
Total derivative assets	83.5	87.1
Total derivative liabilities not designated as hedging instruments	40.5	103.8
Total derivative liabilities	161.8	115.6
Designated as Hedging Instrument [Member]
Schedule of Derivative Instruments in Statement of Financial Position, gross, fair value
Total derivative assets
Other accrued liabilities [Member] | Designated as Hedging Instrument [Member]
Schedule of Derivative Instruments in Statement of Financial Position, gross, fair value
Total derivative liabilities	121.3	11.8
Prepaid expenses and other current assets [Member] | Designated as Hedging Instrument [Member]
Schedule of Derivative Instruments in Statement of Financial Position, gross, fair value
Total derivative assets
Interest Rate Contract [Member] | Other accrued liabilities [Member] | Designated as Hedging Instrument [Member]
Schedule of Derivative Instruments in Statement of Financial Position, gross, fair value
Total derivative liabilities	121.3	11.8
Interest Rate Contract [Member] | Prepaid expenses and other current assets [Member] | Designated as Hedging Instrument [Member]
Schedule of Derivative Instruments in Statement of Financial Position, gross, fair value
Total derivative assets
Commodity Contracts [Member] | Other accrued liabilities [Member]
Schedule of Derivative Instruments in Statement of Financial Position, gross, fair value
Total derivative liabilities not designated as hedging instruments	28.2	84.4
Commodity Contracts [Member] | Prepaid expenses and other current assets [Member]
Schedule of Derivative Instruments in Statement of Financial Position, gross, fair value
Total derivative assets not designated as hedging instruments	79.5	85.4
Foreign Exchange Contracts [Member] | Other accrued liabilities [Member]
Schedule of Derivative Instruments in Statement of Financial Position, gross, fair value
Total derivative liabilities not designated as hedging instruments	11.7	19.2
Foreign Exchange Contracts [Member] | Prepaid expenses and other current assets [Member]
Schedule of Derivative Instruments in Statement of Financial Position, gross, fair value
Total derivative assets not designated as hedging instruments	3.2	1.0
Other [Member] | Other accrued liabilities [Member]
Schedule of Derivative Instruments in Statement of Financial Position, gross, fair value
Total derivative liabilities not designated as hedging instruments	0.6	0.2
Other [Member] | Prepaid expenses and other current assets [Member]
Schedule of Derivative Instruments in Statement of Financial Position, gross, fair value
Total derivative assets not designated as hedging instruments	$ 0.8	$ 0.7