Income Taxes - Schedule of Components of Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Feb. 28, 2019	Nov. 30, 2018	May 31, 2019	May 31, 2018	May 31, 2017
Current provision (benefit)
Federal			$ (107)	$ (540)	$ 269
State and local			64	43	88
Foreign			243	461	285
Current Provision, Total			200	(36)	642
Deferred provision (benefit)
Federal			(61)	271	989
State and local			(7)	125	59
Foreign			(17)	(579)	(108)
Deferred Provision, Total			(85)	(183)	940
Provision for Income Taxes, Total	$ 90	$ 60	$ 115	$ (219)	$ 1,582