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Computation of Earnings Per Share - Schedule of Basic and Diluted Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Basic earnings per common share:
Net earnings allocable to common shares	[1]	$ 2,071	$ 561	$ 3,441	$ 1,974
Weighted-average common shares		268.0	266.0	268.0	266.0
Basic earnings per common share		$ 7.74	$ 2.11	$ 12.85	$ 7.43
Diluted earnings per common share:
Net earnings allocable to common shares	[1]	$ 2,071	$ 561	$ 3,441	$ 1,974
Weighted-average common shares		268.0	266.0	268.0	266.0
Dilutive effect of share-based awards		5.0	5.0	4.0	4.0
Weighted-average diluted shares		273.0	271.0	272.0	270.0
Diluted earnings per common share		$ 7.59	$ 2.07	$ 12.63	$ 7.31
Anti-dilutive options excluded from diluted earnings per common share		1.9	4.0	2.6	4.7
[1] Net earnings available to participating securities were immaterial in all periods presented.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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