Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended							7 Months Ended	12 Months Ended
	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Dec. 31, 2017	May 31, 2019	May 31, 2018		May 31, 2017
Income Taxes [Line Items]
Earnings From Foreign Operations									$ 929	$ 958		$ 919
Statutory Federal Income Tax Rate								35.00%	21.00%	29.20%		35.00%
Benefit from reduction of valuation allowance on tax loss carryforwards									$ 90
Income tax benefit related to lower statutory Income tax rate on earnings	$ 200	$ 60	$ 150	$ 135	$ 100	$ 165			40
Income tax benefit from accelerated deductions to be claimed on 2018 tax return									75
Provisional benefit related to remeasurement of net U.S. deferred tax liability						(1,150)				$ (1,150)
Tax benefit from corporate structuring transactions					255					255	[1]	$ 68	[1]
Tax benefits from foreign tax credits					133	12	$ 80		8	225
Impact on tax rate, amount									50	6
Recognition of benefit from TCJA									8	225
Recognition of benefit reversal, if unsuccessful									233
Provisional benefit related to remeasurement of net U.S. deferred tax liability, income tax expense amount recognized									4
Unrecognized Tax Benefits That Would Impact Effective Tax Rate	141				142				141	142
Unrecognized Tax Benefits Accrued Income Tax Penalties And Interest	38				$ 35				38	35
Foreign Country [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards	3,400								3,400
State And Local Jurisdiction [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards	$ 780								780
U.S. Plans [Member]
Income Taxes [Line Items]
Income tax benefit related to lower statutory Income tax rate on earnings										265
Additional provisional amount recognized one time benefit						$ 204				204
Defined benefit plan contributions by employer for one-time benefit										$ 1,500
Adoption of U.S. Foreign Currency Tax Regulations [Member]
Income Taxes [Line Items]
Impact on tax rate, amount												$ 62
Netherlands [Member]
Income Taxes [Line Items]
Expense from the impact on deferred taxes attributable to a lower enacted tax rate									$ 50

[1] The 2018 and 2017 net benefits consist of foreign deferred tax benefits of $434 million and $94 million, respectively, which were partially offset by U.S. deferred tax expenses of $179 million and $26 million, respectively.