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Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
May 31, 2020 | May 31, 2019 | May 31, 2020 | May 31, 2018
Net Goodwill Detail [Abstract] |  |  |  |  |
Gross Goodwill at May 31 |  |  |  |  | $ 8,657
Accumulated impairment charges |  |  |  | $ (2,042) | (1,684)
Goodwill |  | $ 6,884 | $ 6,973 | 6,372 | 6,973
Goodwill Roll Forward |  |  |  |  |
Beginning Goodwill at May 31 |  | 6,884 | 6,973 |  |
Goodwill acquired | [1] |  | 126 |  |
Impairment charges |  | (358) |  |  |
Other | [2] | (154) | (215) |  |
Ending Goodwill at May 31 |  | 6,372 | 6,884 |  |
Accumulated impairment charges |  |  |  | (2,042) | (1,684)
Corporate, Other and Eliminations [Member] |  |  |  |  |
Net Goodwill Detail [Abstract] |  |  |  |  |
Gross Goodwill at May 31 |  |  |  |  | 1,950
Accumulated impairment charges |  |  |  | (1,909) | (1,551)
Goodwill |  | 29 | 394 | 29 | 399
Goodwill Roll Forward |  |  |  |  |
Beginning Goodwill at May 31 |  | 394 | 399 |  |
Impairment charges |  | (358) | 0 |  |
Other | [2] | (7) | (5) |  |
Ending Goodwill at May 31 |  | 29 | 394 |  |
Accumulated impairment charges |  |  |  | (1,909) | (1,551)
FedEx Express Segment [Member] | Operating Segments [Member] |  |  |  |  |
Net Goodwill Detail [Abstract] |  |  |  |  |
Gross Goodwill at May 31 |  |  |  |  | 5,100
Goodwill |  | 4,869 | 5,016 | 4,869 | 5,100
Goodwill Roll Forward |  |  |  |  |
Beginning Goodwill at May 31 |  | 5,016 | 5,100 |  |
Goodwill acquired | [1] |  | 126 |  |
Other | [2] | (147) | (210) |  |
Ending Goodwill at May 31 |  | 4,869 | 5,016 |  |
FedEx Ground Segment [Member] | Operating Segments [Member] |  |  |  |  |
Net Goodwill Detail [Abstract] |  |  |  |  |
Gross Goodwill at May 31 |  |  |  |  | 840
Goodwill |  | 840 | 840 | 840 | 840
Goodwill Roll Forward |  |  |  |  |
Beginning Goodwill at May 31 |  | 840 | 840 |  |
Ending Goodwill at May 31 |  | 840 | 840 |  |
FedEx Freight Segment [Member] | Operating Segments [Member] |  |  |  |  |
Net Goodwill Detail [Abstract] |  |  |  |  |
Gross Goodwill at May 31 |  |  |  |  | 767
Accumulated impairment charges |  |  |  | (133) | (133)
Goodwill |  | 634 | 634 | 634 | 634
Goodwill Roll Forward |  |  |  |  |
Beginning Goodwill at May 31 |  | 634 | 634 |  |
Ending Goodwill at May 31 |  | $ 634 | $ 634 |  |
Accumulated impairment charges |  |  |  | $ (133) | $ (133)
[1] | Goodwill acquired relates to the acquisitions of Flying Cargo and the controlling interest in an existing joint venture with Swiss Post. See Note 3 for more information.
[2] | Primarily currency translation adjustments, purchase price allocation-related adjustments, and acquired goodwill related to immaterial acquisitions.

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