Retirement Benefits and Postemployment Benefits (Schedule of plans with accumulated benefit obiligations in excess of plan assets) (Details) - USD ($) $ in Millions	May 29, 2016	May 31, 2015
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets [Abstract]
Projected benefit obligation	$ 5,490.3	$ 512.3
Accumulated benefit obligation	4,998.3	440.6
Plan assets at fair value	4,498.5	0.0
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets [Abstract]
Projected benefit obligation	0.0	0.0
Accumulated benefit obligation	1,024.7	1,074.8
Plan assets at fair value	602.4	582.8
Postemployment Benefit Plans [Member]
Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets [Abstract]
Projected benefit obligation	4.8	0.0
Accumulated benefit obligation	159.3	143.5
Plan assets at fair value	$ 0.0	$ 0.0