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Retirement Plans - Schedule of Amounts Recognized in Other Comprehensive Income ("OCI") for All Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Other Comprehensive Income Loss Amortization Adjustment From AOCI Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax $ 89 $ 75 $ 80
Pension Plans [Member] | U.S. Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Other Comprehensive Income Loss Amortization Adjustment From AOCI Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax 118 118  
Total recognized in OCI, Gross Amount 118 118  
Other Comprehensive Income Loss Amortization Adjustment From AOCI Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax 83 74  
Total recognized in OCI, Net of Tax Amount 83 74  
Pension Plans [Member] | International Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net (gain) loss and other arising during period, Gross Amount   1  
Other Comprehensive Income Loss Amortization Adjustment From AOCI Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax 2 2  
Total recognized in OCI, Gross Amount 2 3  
Net (gain) loss and other arising during period, Net of Tax Amount   1  
Other Comprehensive Income Loss Amortization Adjustment From AOCI Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax 1 2  
Total recognized in OCI, Net of Tax Amount 1 3  
Postretirement Healthcare Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net (gain) loss and other arising during period, Gross Amount 5 (3)  
Other Comprehensive Income Loss Amortization Adjustment From AOCI Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax 1    
Total recognized in OCI, Gross Amount 6 (3)  
Net (gain) loss and other arising during period, Net of Tax Amount 4 (2)  
Other Comprehensive Income Loss Amortization Adjustment From AOCI Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax 1    
Total recognized in OCI, Net of Tax Amount $ 5 $ (2)