Retirement Plans - Additional Information (Details)		3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2020 Employee	Nov. 30, 2021 USD ($)	Nov. 30, 2020 USD ($)	Feb. 28, 2022 USD ($)	Feb. 28, 2021 USD ($)	May 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Non-cash MTM net loss				$ 260,000,000	$ 52,000,000
401(k) plan description				In 2020, we announced the closing of our U.S.-based defined benefit pension plans to new non-union employees hired on or after January 1, 2020. We introduced an all-401(k) plan retirement benefit structure for eligible employees with a higher company match of up to 8% across all U.S.-based operating companies in 2022. During calendar 2021, current eligible employees under the Portable Pension Account (“PPA”) pension formula were given a one-time option to continue to be eligible for pension compensation credits under the existing PPA formula and remain in the existing 401(k) plan with its match of up to 3.5%, or to cease receiving compensation credits under the PPA and move to the new 401(k) plan with the higher company match of up to 8%. Changes to the new 401(k) plan structure became effective January 1, 2022. While this new program will provide employees greater flexibility and reduce our long-term pension costs, it will not have a material impact on current or near-term financial results.
Future Plan Structure [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Company matching contributions to eligible employees				8.00%
Current Plan Structure [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Company matching contributions to eligible employees				3.50%
Voluntary Contribution [Member] | U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer				$ 500,000,000
Pension Plans [Member] | U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Non-cash MTM net loss				36,000,000
Pension Plans [Member] | U.S. Pension Plans [Member] | Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer						$ 0
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	$ 52,000,000
Pension Plans [Member] | Netherlands [Member]
Defined Benefit Plan Disclosure [Line Items]
Non-cash MTM net loss		$ 224,000,000	$ 52,000,000
MTM loss due to lower discount rate			106,000,000
Curtailment gain			$ 54,000,000
Number of employees frozen | Employee	2,100