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Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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SUBSEQUENT EVENTS (Details)			1 Months Ended		12 Months Ended
SUBSEQUENT EVENTS (Details)	Jun. 09, 2026 USD ($)	Jun. 01, 2026 USD ($)	Jul. 20, 2026 USD ($)	Jun. 30, 2026 USD ($)	May 31, 2026 USD ($)	May 31, 2025 USD ($)	May 31, 2024 USD ($)	Jul. 01, 2026 USD ($)	Feb. 05, 2026 USD ($)	Aug. 31, 2025 EUR (€)	Mar. 31, 2024 USD ($)
Subsequent Event [Line Items]
Payments for repurchase of common stock					$ 796,000,000	$ 3,017,000,000	$ 2,500,000,000
2024 Repurchase Program
Subsequent Event [Line Items]
Stock repurchase program amount authorized to be repurchased, remaining available amount					1,300,000,000
Payments for repurchase of common stock							$ 2,500,000,000
Stock repurchase program amount authorized to be repurchased											$ 5,000,000,000.0
Accelerated Share Repurchase Agreement
Subsequent Event [Line Items]
Payments for repurchase of common stock					$ 776,000,000	$ 3,000,000,000.0
Unsecured Debt \| Senior Unsecured Debt
Subsequent Event [Line Items]
Debt instrument, face amount									$ 3,700,000,000	€ 850,000,000
Unsecured Debt \| Senior Unsecured Debt \| FedEx Freight Holding
Subsequent Event [Line Items]
Debt instrument, face amount									$ 3,700,000,000
Subsequent Event
Subsequent Event [Line Items]
Proceeds from dividends received		$ 4,100,000,000
Payments to purchase debt securities			$ 4,900,000,000
Initial pay rate increase	40.00%
Payment for collective bargaining agreement	$ 625,000,000
Payments for repurchase of common stock				$ 300,000,000
Subsequent Event \| FedEx Freight Holding
Subsequent Event [Line Items]
Retained ownership interest percentage, after spin-off		19.90%
Ownership, after spin-off, monetization period		24 months
Subsequent Event \| Disposal Group, Not Discontinued Operations \| FedEx Supply Chain
Subsequent Event [Line Items]
Enterprise value								$ 1,400,000,000
Subsequent Event \| Accelerated Share Repurchase Agreement
Subsequent Event [Line Items]
Stock repurchase program amount authorized to be repurchased				$ 1,000,000,000.0
Subsequent Event \| 2026 Repurchase Program
Subsequent Event [Line Items]
Stock repurchase program amount authorized to be repurchased			$ 5,000,000,000.0
Common Stock \| Subsequent Event
Subsequent Event [Line Items]
Consideration for spin-off, conversion ratio		0.5
Outstanding shares percent		0.801