Retirement Plans - Schedule of Weighted-Average Asset Allocations for U.S Pension Plans and International Pension Plans (Details) - Pension Plans [Member] - USD ($) $ in Millions		May 31, 2022		May 31, 2021		May 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 26,633		$ 31,918
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 25,970		$ 29,785		$ 26,978
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		$ 1,164		$ 614
Actual %		4.00%		2.00%
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 Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 663		$ 2,133		1,713
Portion of Fair Value of Plan Assets		$ 434		$ 1,882
Actual %		100.00%		100.00%
International Plans [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets		$ 4		$ 10
Actual %		1.00%		1.00%
U.S. Large Cap Equity [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 3,368	[3]	$ 4,038	[4]
Actual %		13.00%	[3]	14.00%	[4]
International Equity Securities [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 3,445	[3]	$ 4,664	[4]
Actual %		13.00%	[3]	16.00%	[4]
International Equity Securities [Member] | International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets	[4]			$ 123
Actual %	[4]			7.00%
Global Equity Funds [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 1,245	[3]	$ 1,668	[4]
Actual %		5.00%	[3]	6.00%	[4]
Global Equity Funds [Member] | International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets	[4]			$ 335
Actual %	[4]			18.00%
U.S. SMID Cap Equity [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 809		$ 967
Actual %		3.00%		3.00%
Corporate Fixed Income Securities [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 6,755		$ 8,714
Actual %		26.00%		29.00%
Corporate Fixed Income Securities [Member] | International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets		$ 62	[3]	$ 434	[4]
Actual %		14.00%	[3]	23.00%	[4]
Government Fixed Income Securities [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 4,401	[3]	$ 5,190	[4]
Actual %		17.00%	[3]	17.00%	[4]
Government Fixed Income Securities [Member] | International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets		$ 261	[3]	$ 574	[4]
Actual %		60.00%	[3]	30.00%	[4]
Mortgage Backed And Other Fixed Income Securities [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 1,251	[3]	$ 1,065	[4]
Actual %		5.00%	[3]	3.00%	[4]
Mortgage Backed And Other Fixed Income Securities [Member] | International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets	[4]			$ 217
Actual %	[4]			12.00%
Alternative investments [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 3,554	[3]	$ 2,855	[4]
Actual %		14.00%	[3]	10.00%	[4]
Alternative investments [Member] | U.S. Plans [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target %		0.00%	[1],[3]	0.00%	[2],[4]
Alternative investments [Member] | U.S. Plans [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target %		15.00%	[1],[3]	15.00%	[2],[4]
Other [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ (22)		$ 10
Other [Member] | International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets		$ 107	[3]	$ 189	[4]
Actual %		25.00%	[3]	9.00%	[4]
Total Equities [Member] | U.S. Plans [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target %		30.00%	[1]	30.00%	[2]
Total Equities [Member] | U.S. Plans [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target %		50.00%	[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]	50.00%	[2]
Total Fixed Income Securities [Member] | U.S. Plans [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target %		60.00%	[1]	70.00%	[2]
Fair Value Inputs Level 1 [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 4,595		$ 6,342
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		29		36
Fair Value Inputs Level 1 [Member] | International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets		203		379
Fair Value Inputs Level 1 [Member] | International Plans [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets		4		10
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		1,235	[3]	1,644	[4]
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		2,551	[3]	3,792	[4]
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		804		884
Fair Value Inputs Level 1 [Member] | Government Fixed Income Securities [Member] | International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets		199	[3]	350	[4]
Fair Value Inputs Level 1 [Member] | Other [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		(24)		(14)
Fair Value Inputs Level 1 [Member] | Other [Member] | International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets	[4]			19
Fair Value, Inputs, Level 2 | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		11,027		12,817
Fair Value, Inputs, Level 2 | U.S. Plans [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		1,135		578
Fair Value, Inputs, Level 2 | International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets				36
Fair Value, Inputs, Level 2 | International Equity Securities [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[4]			2
Fair Value, Inputs, Level 2 | U.S. SMID Cap Equity [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		5		5
Fair Value, Inputs, Level 2 | Corporate Fixed Income Securities [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		6,755		8,714
Fair Value, Inputs, Level 2 | Government Fixed Income Securities [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		2,749	[3]	3,296	[4]
Fair Value, Inputs, Level 2 | Mortgage Backed And Other Fixed Income Securities [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		381	[3]	226	[4]
Fair Value, Inputs, Level 2 | Other [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		2
Fair Value of Plan Liabilities				(4)
Fair Value, Inputs, Level 2 | Other [Member] | International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Portion of Fair Value of Plan Assets	[4]			36
Fair Value Inputs Level 3 [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		811		537		$ 416
Fair Value Inputs Level 3 [Member] | Alternative investments [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 811	[3]	$ 537	[4]

[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.