Retirement Plans - Schedule of Change in Fair Value of Level 3 Assets (Details) - Pension Plans [Member] - USD ($) $ in Millions	12 Months Ended
	May 31, 2023	May 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	$ 26,633
Actual return on plan assets:
Balance at end of year	25,405	$ 26,633
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	25,970	29,785
Actual return on plan assets:
Balance at end of year	24,826	25,970
Fair Value Inputs Level 3 [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	811	537
Actual return on plan assets:
Assets held during current year	66	192
Assets sold during the year	28	29
Purchases, sales and settlements	32	53
Balance at end of year	$ 937	$ 811