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Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2021 | May 31, 2020 | May 31, 2019
Net Goodwill Detail [Abstract] |  |  |  |
Gross Goodwill at May 31 |  |  |  | $ 8,568
Accumulated impairment charges |  | $ (2,042) |  | (1,684)
Goodwill |  | 6,992 | $ 6,372 | 6,884
Goodwill Roll Forward |  |  |  |
Beginning Goodwill at May 31 |  | 6,372 | 6,884 |
Impairment charges |  | 0 | (358) | 0
Goodwill acquired | [1] | 161 |  |
Other | [2] | 459 | (154) |
Ending Goodwill at May 31 |  | 6,992 | 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 |  |  |  | 1,945
Accumulated impairment charges |  | (1,909) |  | (1,551)
Goodwill |  | 57 | 29 | 394
Goodwill Roll Forward |  |  |  |
Beginning Goodwill at May 31 |  | 29 | 394 |
Impairment charges |  |  | (358) |
Goodwill acquired | [1] | 40 |  |
Other | [2] | (12) | (7) |
Ending Goodwill at May 31 |  | 57 | 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 |  |  |  | 5,016
Goodwill |  | 5,358 | 4,869 | 5,016
Goodwill Roll Forward |  |  |  |
Beginning Goodwill at May 31 |  | 4,869 | 5,016 |
Goodwill acquired | [1] | 18 |  |
Other | [2] | 471 | (147) |
Ending Goodwill at May 31 |  | 5,358 | 4,869 | 5,016
FedEx Ground Segment [Member] | Operating Segments [Member] |  |  |  |
Net Goodwill Detail [Abstract] |  |  |  |
Gross Goodwill at May 31 |  |  |  | 840
Goodwill |  | 943 | 840 | 840
Goodwill Roll Forward |  |  |  |
Beginning Goodwill at May 31 |  | 840 | 840 |
Goodwill acquired | [1] | 103 |  |
Ending Goodwill at May 31 |  | 943 | 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
Goodwill Roll Forward |  |  |  |
Beginning Goodwill at May 31 |  | 634 | 634 |
Ending Goodwill at May 31 |  | 634 | $ 634 | 634
Accumulated impairment charges |  | $ (133) |  | $ (133)
[1] | Goodwill acquired relates to the acquisition of ShopRunner. See Note 4 for more information.
[2] | Primarily currency translation adjustments and purchase price allocation-related adjustments.

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