Retirement Plans - Schedule of Change in Fair Value of Level 3 Assets (Details) - Pension Plans [Member] - USD ($) $ in Millions	12 Months Ended
	May 31, 2024	May 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	$ 25,405
Actual return on plan assets:
Balance at end of year	26,399	$ 25,405
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	24,826	25,970
Actual return on plan assets:
Balance at end of year	25,797	24,826
Fair Value Inputs Level 3 [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	937	811
Actual return on plan assets:
Assets held during current year	59	66
Assets sold during the year	30	28
Purchases, sales, and settlements, net	49	32
Balance at end of year	$ 1,075	$ 937