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Description of Business Segments and Summary of Significant Accounting Policies - Schedule of Revenue by Service Type (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2024 | Nov. 30, 2023 | Nov. 30, 2024 | Nov. 30, 2023
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues |  | $ 21,967 | $ 22,165 | $ 43,546 | $ 43,846
Operating Segments [Member] | Federal Express Segment [Member] |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues |  | 18,841 | 18,773 | 37,146 | 37,199
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member] |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues |  | 17,027 | 16,907 | 33,503 | 33,484
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member] | U.S. priority [Member] |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues |  | 2,563 | 2,605 | 5,154 | 5,278
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member] | U.S. deferred [Member] |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues |  | 1,199 | 1,207 | 2,350 | 2,394
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member] | U.S. ground [Member] |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues |  | 8,256 | 8,309 | 16,312 | 16,442
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member] | Total U.S [Member] |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues |  | 12,018 | 12,121 | 23,816 | 24,114
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member] | International priority [Member] |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues |  | 2,231 | 2,390 | 4,437 | 4,717
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member] | International economy [Member] |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues |  | 1,588 | 1,183 | 2,948 | 2,300
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member] | Total international export package revenue [Member] |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues |  | 3,819 | 3,573 | 7,385 | 7,017
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member] | International domestic [Member] |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues | [1] | 1,190 | 1,213 | 2,302 | 2,353
Operating Segments [Member] | Federal Express Segment [Member] | Total freight revenue [Member] |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues |  | 1,552 | 1,615 | 3,110 | 3,217
Operating Segments [Member] | Federal Express Segment [Member] | Total freight revenue [Member] | Total U.S [Member] |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues |  | 383 | 577 | 952 | 1,154
Operating Segments [Member] | Federal Express Segment [Member] | Total freight revenue [Member] | International priority [Member] |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues |  | 640 | 568 | 1,166 | 1,121
Operating Segments [Member] | Federal Express Segment [Member] | Total freight revenue [Member] | International economy [Member] |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues |  | 529 | 470 | 992 | 942
Operating Segments [Member] | Federal Express Segment [Member] | Other [Member] |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues |  | 262 | 251 | 533 | 498
Operating Segments [Member] | FedEx Freight Segment [Member] |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues |  | 2,177 | 2,452 | 4,506 | 4,837
Other and eliminations [Member] |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Revenues | [2] | $ 949 | $ 940 | $ 1,894 | $ 1,810
[1] | International domestic revenue relates to our international intra-country operations.
[2] | Includes the FedEx Dataworks, Inc. (“FedEx Dataworks”), FedEx Office and Print Services, Inc. (“FedEx Office”), and FedEx Logistics, Inc. (“FedEx Logistics”) operating segments.

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