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Retirement Plans (Details 13) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income [Abstract]      
Other Comprehensive Income Loss Amortization Adjustment From AOCI Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax $ (121) $ (115) $ (115)
Total recognized in OCI, Net of Tax Amount 80   $ 76
Pension Plans [Member]      
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income [Abstract]      
Net (gain) loss and other arising during period, Gross Amount   (113)  
Other Comprehensive Income Loss Amortization Adjustment From AOCI Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax (121) (115)  
Total recognized in OCI, Gross Amount 121 2  
Net (gain) loss and other arising during period, Net of Tax Amount   (72)  
Other Comprehensive Income Loss Amortization Adjustment From AOCI Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax (76) (72)  
Total recognized in OCI, Net of Tax Amount $ 76 0  
Postretirement Healthcare Plans [Member]      
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income [Abstract]      
Net (gain) loss and other arising during period, Net of Tax Amount   (1)  
Total recognized in OCI, Net of Tax Amount   $ (1)