Retirement Plans - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Nov. 30, 2021	Feb. 28, 2023	Feb. 28, 2022
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer		$ 800,000,000
Non-cash MTM net loss			$ 260,000,000
Pension Plans [Member] | U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan expected future employer contributions		$ 0
Non-cash MTM net loss			36,000,000
Pension Plans [Member] | North America [Member]
Defined Benefit Plan Disclosure [Line Items]
Non-cash MTM net loss	$ 36,000,000
Percentage of FedEx Freight employees elected to move to new 401(k) plan	21.00%
MTM loss due to lower discount rate	$ 75,000,000
Curtailment gain	39,000,000
Pension Plans [Member] | International Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Non-cash MTM net loss			$ 224,000,000
Pension Plans [Member] | Netherlands [Member]
Defined Benefit Plan Disclosure [Line Items]
Non-cash MTM net loss	$ 224,000,000