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Business Segments and Disaggregated Revenue - Schedule of Geographical Information (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2021 | May 31, 2020 | May 31, 2019 | [2]
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |
Revenues | [1] | $ 83,959 | $ 69,217 | $ 69,693
Assets Noncurrent | [1] | 62,197 | 57,154 | 41,317
U.S. [Member] |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |
Revenues | [1] | 58,792 | 48,404 | 47,584
Assets Noncurrent | [1] | 49,407 | 45,691 | 33,189
International [Member] |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |
Revenues | [1] | 25,167 | 20,813 | 22,109
Assets Noncurrent | [1] | 12,790 | 11,463 | 8,128
FedEx Express Segment [Member] | International [Member] |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |
Revenues | [1] | 23,085 | 19,177 | 20,424
FedEx Ground Segment [Member] | International [Member] |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |
Revenues | [1] | 735 | 479 | 467
FedEx Freight Segment [Member] | International [Member] |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |
Revenues | [1] | 190 | 192 | 207
FedEx Services Segment [Member] | International [Member] |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |
Revenues | [1] | 1 | 1 | 1
Other international revenue [Member] | International [Member] |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |
Revenues | [1] | $ 1,156 | $ 964 | $ 1,010
[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.

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