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Accumulated Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) ("AOCI") (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance				$ 18,295
Translation adjustments		$ 124	$ 72	253	$ (11)
Ending Balance		21,039	18,659	21,039	18,659
Foreign Currency Translation Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(1,078)	(1,036)	(1,207)	(954)
Translation adjustments		124	72	253	(11)
Ending Balance		(954)	(964)	(954)	(964)
Foreign Currency Translation Loss [Member] | ASU 2018-02 [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification to retained earnings due to the adoption of ASU 2018-02					1
Retirement Plans Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		58	118	60	89
Reclassifications from AOCI		(2)	(20)	(4)	(41)
Ending Balance		56	98	56	98
Retirement Plans Adjustments [Member] | ASU 2018-02 [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification to retained earnings due to the adoption of ASU 2018-02					50
Accumulated Other Comprehensive (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(1,020)	(918)	(1,147)	(865)
Ending Balance		$ (898)	$ (866)	$ (898)	(866)
Accumulated Other Comprehensive (Loss) [Member] | ASU 2018-02 [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification to retained earnings due to the adoption of ASU 2018-02	[1]				$ 51
[1] Relates to the adoption of ASU 2018-02.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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