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Retirement Plans (Details 11) - USD ($)
$ in Millions
 12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income [Abstract]      
Total recognized in OCI, Net of Tax Amount   $ 76 $ 63
Pension Plans [Member]      
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income [Abstract]      
Net (gain) loss and other arising during period, Gross Amount $ (113) (1)  
Other Comprehensive Income Loss Amortization Adjustment From AOCI Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax 115 115  
Total recognized in OCI, Gross Amount 2 114  
Net (gain) loss and other arising during period, Net of Tax Amount (72) (1)  
Other Comprehensive Income Loss Amortization Adjustment From AOCI Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax 72 77  
Total recognized in OCI, Net of Tax Amount 0 $ 76  
Postretirement Healthcare Plans [Member]      
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income [Abstract]      
Net (gain) loss and other arising during period, Gross Amount (1)    
Total recognized in OCI, Gross Amount $ (1)