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Income Taxes - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended	5 Months Ended	7 Months Ended	9 Months Ended		12 Months Ended
	Feb. 07, 2018	Feb. 28, 2018	May 31, 2018	Dec. 31, 2017	Feb. 28, 2018	Feb. 28, 2017	May 31, 2019	May 31, 2018
Income Taxes [Line Items]
Statutory federal income tax rate				35.00%
Measurement period					1 year
Provisional benefit related to remeasurement of net U.S. deferred tax liability		$ 1,150
Provisional benefit from foreign tax credits exceeding one-time transition tax on deferred foreign earnings		36
U.S. Pension Plans [Member]
Income Taxes [Line Items]
Additional provisional amount recognized one time benefit		$ 204
Benefit of contribution	$ 1,500				$ 2,500	$ 1,750
Scenario Plan [Member]
Income Taxes [Line Items]
Statutory federal income tax rate			29.20%				21.00%
Scenario, Forecast [Member]
Income Taxes [Line Items]
Income tax benefit related to lower statutory income tax rate year-to-date earnings								$ 165

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