Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	May 26, 2013	May 27, 2012	May 29, 2011	May 30, 2010
Tax Credit Carryforward [Line Items]
Valuation allowance	$ 232,800,000	$ 384,400,000
Deferred tax asset for losses recorded as part of Pillsbury acquisition	161,800,000
Operating loss carryforwards valuation allowance	67,100,000
Reversal of deferred tax assets and related valuation allowances	85,600,000
Foreign loss carryforwards with no expiration	33,400,000
Foreign loss carryforwards expiring in years 1 and 2	4,600,000
Foreign loss carryforwards expiring in 3 years and beyond	21,600,000
Unremitted foreign earnings	2,700,000,000
Decrease (increase) in deferred tax assets related to Medicare Part D subsidy	33,700,000			(35,000,000)
Decrease to deferred income tax liabilities related to GMC restructuring	63,300,000
Income tax examination potential one-time cash tax payment	80,000,000
Increase in unrecognized tax benefit liabilities resulting from prior period tax positions with the state of California			11,500,000
Reduction in unrecognized tax benefit liabilities resulting from settlement of prior period tax positions with the IRS			108,100,000
Payments for tax settlements			385,300,000
Unrecognized tax benefits that would affect effective tax rate	92,000,000
Tax-related net interest and penalties recognized	3,000,000	(200,000)
Tax-related net interest and penalties accrued	53,100,000	49,300,000
Unrecognized tax benefits and accrued interest expected to be paid within the next 12 months	12,000,000
Minimum [Member]
Tax Credit Carryforward [Line Items]
Number of open tax years for certain U.S. jurisdictions	3 years
Maximum [Member]
Tax Credit Carryforward [Line Items]
Number of open tax years for certain U.S. jurisdictions	5 years
US Foreign [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward amount	$ 72,000,000