Retirement and Postemployment Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 26, 2012	Feb. 27, 2011	Feb. 26, 2012	Feb. 27, 2011
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 28.6	$ 25.4	$ 85.7	$ 75.9
Interest cost	59.5	57.8	178.5	173.0
Defined Benefit Plan Expected Return On Plan Assets	110.0	102.1	330.2	306.1
Defined Benefit Plan Amortization Of Gains Losses	(27.0)	(20.4)	(81.1)	(61.1)
Amortization of prior service costs (credits)	2.1	2.2	6.4	6.7
Other adjustments	0	0	0	0
Net (income) expense	7.2	3.7	21.5	10.6
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	4.5	4.6	13.5	13.9
Interest cost	13.9	15.0	41.7	45.0
Defined Benefit Plan Expected Return On Plan Assets	8.9	8.4	26.6	24.9
Defined Benefit Plan Amortization Of Gains Losses	(3.7)	(3.7)	(10.9)	(10.9)
Amortization of prior service costs (credits)	(0.9)	(0.2)	(2.6)	(0.4)
Other adjustments	0	0	0	0
Net (income) expense	12.3	14.7	36.9	44.5
Postemployment Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.8	2.0	5.6	6.0
Interest cost	1.2	1.3	3.6	3.8
Defined Benefit Plan Expected Return On Plan Assets	0	0	0	0
Defined Benefit Plan Amortization Of Gains Losses	(0.4)	(0.5)	(1.3)	(1.6)
Amortization of prior service costs (credits)	0.6	0.6	1.6	1.8
Other adjustments	2.3	2.0	6.9	6.0
Net (income) expense	$ 6.3	$ 6.4	$ 19.0	$ 19.2