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Condensed Consolidated Statements of Changes in Common Stockholders' Investment (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Statement Of Stockholders Equity [Abstract]
Cash dividends declared, per share	$ 0.65	$ 0.65	$ 1.95	$ 1.95
Other comprehensive income, tax (expense)/benefit	$ (6)	$ (1)	$ (3)	$ 8
Purchase of treasury stock			0	20,000.00
Employee incentive plans and other, shares issued	2,400,000	200,000	3,400,000	500,000

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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