Retirement Plans - Schedule of Pension Plans Contributions (Details) - U.S. Pension Plans [Member] - USD ($) $ in Millions	12 Months Ended
	May 31, 2017	May 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Contributions By Employer	$ 2,000	$ 660
Required Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Contributions By Employer	459	8
Voluntary Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Contributions By Employer	$ 1,541	$ 652