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Business Segments and Disaggregated Revenue - Schedule of Revenue by Service Type (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2021 | May 31, 2020 | May 31, 2019 | [2]
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues | [1] | $ 83,959 | $ 69,217 | $ 69,693
Operating Segments [Member] | FedEx Express Segment [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues |  | 42,078 | 35,513 | 37,331
Operating Segments [Member] | FedEx Express Segment [Member] | U.S. overnight box [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues |  | 8,116 | 7,234 | 7,663
Operating Segments [Member] | FedEx Express Segment [Member] | U.S. overnight envelope [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues |  | 1,791 | 1,776 | 1,829
Operating Segments [Member] | FedEx Express Segment [Member] | U.S. deferred [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues |  | 4,984 | 4,038 | 4,225
Operating Segments [Member] | FedEx Express Segment [Member] | Total U.S. domestic package revenue [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues |  | 14,891 | 13,048 | 13,717
Operating Segments [Member] | FedEx Express Segment [Member] | International priority [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues |  | 10,317 | 7,354 | 7,405
Operating Segments [Member] | FedEx Express Segment [Member] | International economy [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues |  | 2,632 | 3,082 | 3,446
Operating Segments [Member] | FedEx Express Segment [Member] | Total international export package revenue [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues |  | 12,949 | 10,436 | 10,851
Operating Segments [Member] | FedEx Express Segment [Member] | International domestic [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues | [3] | 4,640 | 4,179 | 4,540
Operating Segments [Member] | FedEx Express Segment [Member] | Total package revenue [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues |  | 32,480 | 27,663 | 29,108
Operating Segments [Member] | FedEx Express Segment [Member] | U.S. freight [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues |  | 3,325 | 2,998 | 3,025
Operating Segments [Member] | FedEx Express Segment [Member] | International priority freight [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues |  | 3,030 | 1,915 | 2,070
Operating Segments [Member] | FedEx Express Segment [Member] | International Economy Freight |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues |  | 1,582 | 1,930 | 2,123
Operating Segments [Member] | FedEx Express Segment [Member] | International Airfreight [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues |  | 245 | 270 | 314
Operating Segments [Member] | FedEx Express Segment [Member] | Total freight revenue [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues |  | 8,182 | 7,113 | 7,532
Operating Segments [Member] | FedEx Express Segment [Member] | Other [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues | [4] | 1,416 | 737 | 691
Operating Segments [Member] | FedEx Ground Segment [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues |  | 30,496 | 22,733 | 20,522
Operating Segments [Member] | FedEx Freight Segment [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues |  | 7,833 | 7,102 | 7,582
Operating Segments [Member] | FedEx Services Segment [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues |  | 32 | 22 | 22
Corporate, Other and Eliminations [Member] |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Revenues | [5] | $ 3,520 | $ 3,847 | $ 4,236
[1] | International revenue includes shipments that either originate in or are destined to locations outside the United States, which could include U.S. payors. Noncurrent assets include property and equipment, goodwill and other long-term assets. Our flight equipment is registered in the U.S. and is included as U.S. assets; however, many of our aircraft operate internationally.
[2] | Prior year amounts have been revised to conform to the current year presentation.
[3] | International domestic revenue relates to our intra-country operations.
[4] | Includes the operations of FedEx Custom Critical beginning March 1, 2020 and FedEx Cross Border beginning June 1, 2020.
[5] | Includes the FedEx Office and FedEx Logistics operating segments, as well as the financial results of ShopRunner beginning December 23, 2020.

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