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Retirement Benefits and Postemployment Benefits (Schedule of level 3 investments of benefit plan assets) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
May 25, 2014
Defined Benefit Pension Plans [Member]
May 26, 2013
Defined Benefit Pension Plans [Member]
May 27, 2012
Defined Benefit Pension Plans [Member]
May 25, 2014
Defined Benefit Pension Plans [Member]
Equity [Member]
May 26, 2013
Defined Benefit Pension Plans [Member]
Equity [Member]
May 25, 2014
Defined Benefit Pension Plans [Member]
Real asset investments [Member]
May 26, 2013
Defined Benefit Pension Plans [Member]
Real asset investments [Member]
May 25, 2014
Defined Benefit Pension Plans [Member]
Other Investments [Member]
May 26, 2013
Defined Benefit Pension Plans [Member]
Other Investments [Member]
May 25, 2014
Defined Benefit Pension Plans [Member]
Level 3 [Member]
May 26, 2013
Defined Benefit Pension Plans [Member]
Level 3 [Member]
May 25, 2014
Defined Benefit Pension Plans [Member]
Level 3 [Member]
Equity [Member]
May 26, 2013
Defined Benefit Pension Plans [Member]
Level 3 [Member]
Equity [Member]
May 25, 2014
Defined Benefit Pension Plans [Member]
Level 3 [Member]
Real asset investments [Member]
May 26, 2013
Defined Benefit Pension Plans [Member]
Level 3 [Member]
Real asset investments [Member]
May 25, 2014
Defined Benefit Pension Plans [Member]
Level 3 [Member]
Other Investments [Member]
May 26, 2013
Defined Benefit Pension Plans [Member]
Level 3 [Member]
Other Investments [Member]
May 25, 2014
Other Postretirement Benefit Plans [Member]
May 26, 2013
Other Postretirement Benefit Plans [Member]
May 27, 2012
Other Postretirement Benefit Plans [Member]
May 25, 2014
Other Postretirement Benefit Plans [Member]
Equity [Member]
May 26, 2013
Other Postretirement Benefit Plans [Member]
Equity [Member]
May 25, 2014
Other Postretirement Benefit Plans [Member]
Real asset investments [Member]
May 26, 2013
Other Postretirement Benefit Plans [Member]
Real asset investments [Member]
May 25, 2014
Other Postretirement Benefit Plans [Member]
Other Investments [Member]
May 26, 2013
Other Postretirement Benefit Plans [Member]
Other Investments [Member]
May 25, 2014
Other Postretirement Benefit Plans [Member]
Level 3 [Member]
May 26, 2013
Other Postretirement Benefit Plans [Member]
Level 3 [Member]
May 25, 2014
Other Postretirement Benefit Plans [Member]
Level 3 [Member]
Equity [Member]
May 26, 2013
Other Postretirement Benefit Plans [Member]
Level 3 [Member]
Equity [Member]
May 25, 2014
Other Postretirement Benefit Plans [Member]
Level 3 [Member]
Real asset investments [Member]
May 26, 2013
Other Postretirement Benefit Plans [Member]
Level 3 [Member]
Real asset investments [Member]
May 25, 2014
Other Postretirement Benefit Plans [Member]
Level 3 [Member]
Other Investments [Member]
May 26, 2013
Other Postretirement Benefit Plans [Member]
Level 3 [Member]
Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]                                                                    
Fair value at beginning of year $ 5,611.8 $ 5,066.1 $ 4,353.9 $ 2,667.5 $ 2,827.0 $ 829.4 $ 730.6 $ 0.3 $ 61.2 $ 990.0 $ 936.9 $ 559.3 $ 575.4 $ 430.4 $ 361.2 $ 0.3 $ 0.3 $ 517.3 $ 436.9 $ 358.8 $ 236.8 $ 205.3 $ 37.2 $ 23.4 $ 152.4 $ 130.9 $ 34.7 $ 30.4 $ 20.2 $ 22.0 $ 14.5 $ 8.4 $ 0 $ 0
Transfers In/(Out)                   0 (0.1) 0 (0.1) 0 0 0 0                   (4.2) 0 0 0 (4.2) 0    
Purchases, Sales Issuances, and Settlements (Net)                   (84.5) (12.7) (59.0) (61.0) (25.5) 48.3 0 0                   0.7 2.5 (0.7) (2.3) 1.4 4.8    
Actual return on plan assets still held                   265.9 65.9 67.9 45.0 198.0 20.9 0 0                   7.8 1.8 1.6 0.5 6.2 1.3    
Fair value at end of year $ 5,611.8 $ 5,066.1 $ 4,353.9 $ 2,667.5 $ 2,827.0 $ 829.4 $ 730.6 $ 0.3 $ 61.2 $ 1,171.4 $ 990.0 $ 568.2 $ 559.3 $ 602.9 $ 430.4 $ 0.3 $ 0.3 $ 517.3 $ 436.9 $ 358.8 $ 236.8 $ 205.3 $ 37.2 $ 23.4 $ 152.4 $ 130.9 $ 39.0 $ 34.7 $ 21.1 $ 20.2 $ 17.9 $ 14.5 $ 0 $ 0