Retirement Plans - Schedule of Weighted-Average Asset Allocations for U.S Pension Plans and International Pension Plan (Details) - Pension Plans [Member] - USD ($) $ in Millions		May 31, 2024		May 31, 2023		May 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 26,399		$ 25,405
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 25,797		$ 24,826		$ 25,970
Actual %		100.00%		100.00%
U.S. Plans [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 577		$ 815
Actual %		2.00%		3.00%
U.S. Plans [Member] | Cash And Cash Equivalents [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target %		0.00%	[1]	0.00%	[2]
U.S. Plans [Member] | Cash And Cash Equivalents [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target %		5.00%	[1]	5.00%	[2]
International Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 602		$ 579		663
Portion of Fair Value of Plan Assets		$ 341		$ 337
Actual %		100.00%		100.00%
International Plan [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets		$ 8		$ 7
Actual %		2.00%		2.00%
U.S. Large Cap Equity [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[3]	$ 3,376		$ 2,928
Actual %	[3]	13.00%		12.00%
International Equity Securities [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[3]	$ 2,631		$ 2,821
Actual %	[3]	10.00%		11.00%
Global Equity Funds [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[3]	$ 1,397		$ 1,192
Actual %	[3]	5.00%		5.00%
U.S. SMID Cap Equity [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 926		$ 768
Actual %		4.00%		3.00%
Corporate Fixed Income Securities [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 6,502		$ 6,403
Actual %		25.00%		26.00%
Corporate Fixed Income Securities [Member] | International Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets	[3]	$ 62		$ 57
Actual %	[3]	18.00%		17.00%
Government Fixed Income Securities [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[3]	$ 4,194		$ 4,334
Actual %	[3]	16.00%		17.00%
Government Fixed Income Securities [Member] | International Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets	[3]	$ 177		$ 178
Actual %	[3]	52.00%		53.00%
Mortgage Backed And Other Fixed Income Securities [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[3]	$ 1,514		$ 1,386
Actual %	[3]	6.00%		6.00%
Alternative investments [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[3]	$ 4,777		$ 4,196
Actual %	[3]	19.00%		17.00%
Alternative investments [Member] | U.S. Plans [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target %		15.00%	[1],[4]	0.00%	[2],[3]
Alternative investments [Member] | U.S. Plans [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target %		25.00%	[1],[4]	15.00%	[2],[3]
Other [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ (97)		$ (17)
Other [Member] | International Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets	[3]	$ 94		$ 95
Actual %	[3]	28.00%		28.00%
Total Equities [Member] | U.S. Plans [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target %		25.00%	[1]	30.00%	[2]
Total Equities [Member] | U.S. Plans [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target %		40.00%	[1]	50.00%	[2]
Total Fixed Income Securities [Member] | U.S. Plans [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target %		40.00%	[1]	40.00%	[2]
Total Fixed Income Securities [Member] | U.S. Plans [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target %		60.00%	[1]	60.00%	[2]
Fair Value Inputs Level 1 [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 4,097		$ 3,933
Fair Value Inputs Level 1 [Member] | U.S. Plans [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		130		22
Fair Value Inputs Level 1 [Member] | International Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets		157		166
Fair Value Inputs Level 1 [Member] | International Plan [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets		8		7
Fair Value Inputs Level 1 [Member] | U.S. Large Cap Equity [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[3]	1,382		1,268
Fair Value Inputs Level 1 [Member] | International Equity Securities [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[3]	1,780		1,912
Fair Value Inputs Level 1 [Member] | U.S. SMID Cap Equity [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		916		764
Fair Value Inputs Level 1 [Member] | Government Fixed Income Securities [Member] | International Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets	[3]	149		159
Fair Value Inputs Level 1 [Member] | Other [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		(111)		(33)
Fair Value Inputs Level 2 [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		9,513		10,240
Fair Value Inputs Level 2 [Member] | U.S. Plans [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		447		793
Fair Value Inputs Level 2 [Member] | U.S. SMID Cap Equity [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		10		4
Fair Value Inputs Level 2 [Member] | Corporate Fixed Income Securities [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		6,502		6,403
Fair Value Inputs Level 2 [Member] | Government Fixed Income Securities [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[3]	2,335		2,497
Fair Value Inputs Level 2 [Member] | Mortgage Backed And Other Fixed Income Securities [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[3]	205		527
Fair Value Inputs Level 2 [Member] | Other [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		14		16
Fair Value Inputs Level 3 [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		1,075		937		$ 811
Fair Value Inputs Level 3 [Member] | Alternative investments [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[3]	$ 1,075		$ 937

[1] Target ranges have not been provided for international plan assets as they are managed at an individual country level.

[2] Target ranges have not been provided for international plan assets as they are managed at an individual country level.

[3] Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy but are included in the total.

[4] Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy but are included in the total.