Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended	5 Months Ended	9 Months Ended
	Feb. 28, 2018	May 31, 2018	Feb. 28, 2018	Feb. 28, 2017	May 31, 2017
Income Tax [Line Items]
Effective tax rate on continuing operations (percent)			74.40%	13.10%
Tax Cuts and Jobs Act of 2017, incomplete accounting, provisional income tax expense benefit)	$ 2,030		$ 2,030
Tax Cuts and Jobs Act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense			$ 2,010
Installment period			8 years
Tax Cuts And Jobs Act of 2017, incomplete accounting, change in tax rate, provisional income tax expense			$ 107
Tax Cuts and Jobs Act of 2017, incomplete accounting, change in tax rate, deferred tax asset, provisional income tax expense (benefit), gross			149
Effective income tax rate reconciliation, change in enacted tax rate, amount			42
Total gross unrecognized tax benefits, excluding related interest and penalties	718		718		$ 461
Total gross unrecognized tax benefits, excluding related interest and penalties, amount which would affect the Company's effective tax rate if recognized in future periods	504		504
Change in income tax penalties and interest accrued			(25)
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit)	146		146		$ 171
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations	$ 126		126
Scenario, Forecast
Income Tax [Line Items]
Blended federal statutory rate		29.00%
Deferred income taxes and other liabilities
Income Tax [Line Items]
Tax Cuts and Jobs Act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense			$ 1,242