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DESCRIPTION OF BUSINESS SEGMENTS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES- Additional Information (Details) $ / shares in Units, € in Millions, shares in Millions, $ in Millions | 3 Months Ended |  |  |  |  |  |
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Aug. 31, 2025 USD ($) employee location swap $ / shares shares | Aug. 31, 2024 USD ($) $ / shares shares | Aug. 31, 2025 EUR (€) location swap | Aug. 07, 2025 $ / shares | May 31, 2025 USD ($) | Jun. 30, 2024 USD ($) | May 31, 2024 USD ($) | Mar. 31, 2024 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Gross contract assets related to in-transit shipments | $ 645 |  |  |  | $ 673 |  |  |
Contract assets net of deferred unearned revenue | 536 |  |  |  | 526 |  |  |
Contract liabilities related to advance payments from customers | 20 |  |  |  | 23 |  |  |
Stock-based compensation | 56 | $ 48 |  |  |  |  |  |
Business optimization costs | 67 | 128 |  |  |  |  |  |
Business optimization costs, net of tax | $ 52 | $ 98 |  |  |  |  |  |
Business optimization costs (in dollars per share) | $ / shares | $ 0.22 | $ 0.39 |  |  |  |  |  |
Number of employees will affect in workforce reduction plan | employee | 1,400 |  |  |  |  |  |  |
Consultation process expected occur period | 18 months |  |  |  |  |  |  |
Expected savings | $ 150 |  |  |  |  |  |  |
Expected cash expenditures |  |  |  |  |  | $ 250 |  |
Restructuring costs | 3 |  |  |  |  |  |  |
FedEx Freight spin-off costs | 43 |  |  |  |  |  |  |
FedEx Freight spin-off costs, net of tax | $ 33 |  |  |  |  |  |  |
FedEx Freight spin-off costs (in dollar per share) | $ / shares | $ 0.14 |  |  |  |  |  |  |
Fiscal year change | $ 4 |  |  |  |  |  |  |
Fiscal year change, net of tax | $ 3 |  |  |  |  |  |  |
Fiscal year change (in dollar per share) | $ / shares | $ 0.01 |  |  |  |  |  |  |
Denominated debt as a net investment hedge | € |  |  | € 845 |  |  |  |  |
Fair value of swaps classified as asset | $ 12 |  |  |  | 13 |  |  |
Fair value of swaps classified as liabilities | 119 |  |  |  | 108 |  |  |
Equity securities | 535 |  |  |  | 506 |  |  |
Debt securities | $ 71 |  |  |  | 70 |  |  |
Shares repurchased (in shares) | shares | 2.2 | 3.4 |  |  |  |  |  |
Payments for repurchase of common stock | $ 500 | $ 1,000 |  |  |  |  |  |
Cash dividend payable (in dollars per share) | $ / shares |  |  |  | $ 1.45 |  |  |  |
Dividends paid (in dollars per share) | $ / shares | $ 1.45 |  |  |  |  |  |  |
Separation and other costs |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
FedEx Freight spin-off costs | $ 41 |  |  |  |  |  |  |
Other, net |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
FedEx Freight spin-off costs | $ 2 |  |  |  |  |  |  |
Currency Swap |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Number of swaps outstanding | swap | 4 |  | 4 |  |  |  |  |
Accelerated Share Repurchase Agreement |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program amount authorized to be repurchased |  |  |  |  |  |  |  | $ 5,000
Shares repurchased (in shares) | shares | 2.2 | 3.4 |  |  |  |  |  |
Treasury stock acquired, average cost (in dollars per share) | $ / shares | $ 232.25 | $ 295.99 |  |  |  |  |  |
Payments for repurchase of common stock | $ 500 | $ 1,000 |  |  |  |  |  |
Stock repurchase program amount authorized to be repurchased, remaining available amount | 1,600 |  |  |  |  |  |  |
Supply Chain Finance |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Outstanding payment obligations | $ 116 | $ 75 |  |  | $ 71 |  | $ 94 |
Network 2.0 Optimization |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Number of business locations | location | 360 |  | 360 |  |  |  |  |

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