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Retirement Plans - Schedule of Pension Plans Contributions (Details) - USD ($)
$ in Millions
9 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan Contributions By Employer $ 1,750 $ 495
Required U.S. Pension Plan Contribution [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan Contributions By Employer 444 8
Voluntary U.S. Pension Plan Contribution [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan Contributions By Employer $ 1,306 $ 487