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Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
May 31, 2018 | May 31, 2017 | May 31, 2018 | May 31, 2016
Net Goodwill Detail [Abstract] |  |  |  |  |
Gross Goodwill at May 31 |  |  |  |  | $ 8,057
Accumulated impairment charges |  |  |  | $ (1,684) | (1,310)
GOODWILL |  | $ 6,973 | $ 7,154 | 6,973 | 6,747
Goodwill Roll Forward |  |  |  |  |
Beginning Goodwill at May 31 |  | 7,154 | 6,747 |  |
Goodwill acquired | [1] | 125 |  |  |
Purchase adjustments and other | [2] | 68 | 407 |  |
Impairment charges | [3] | (374) |  |  |
Ending Goodwill at May 31 |  | 6,973 | 7,154 |  |
Accumulated impairment charges |  |  |  | (1,684) | (1,310)
Corporate, Other and Eliminations [Member] |  |  |  |  |
Net Goodwill Detail [Abstract] |  |  |  |  |
Gross Goodwill at May 31 |  |  |  |  | 395
Accumulated impairment charges |  |  |  | (374) |
GOODWILL |  | 395 | 395 | 51 | 395
Goodwill Roll Forward |  |  |  |  |
Beginning Goodwill at May 31 |  | 395 | 395 |  |
Goodwill acquired | [1] | 32 |  |  |
Purchase adjustments and other | [2] | (2) |  |  |
Impairment charges | [3] | (374) |  |  |
Ending Goodwill at May 31 |  | 51 | 395 |  |
Accumulated impairment charges |  |  |  | (374) |
FedEx Express Segment [Member] |  |  |  |  |
Net Goodwill Detail [Abstract] |  |  |  |  |
Gross Goodwill at May 31 |  |  |  |  | 4,546
GOODWILL |  | 4,953 | 4,546 | 5,100 | 4,546
Goodwill Roll Forward |  |  |  |  |
Beginning Goodwill at May 31 |  | 4,953 | 4,546 |  |
Goodwill acquired | [1] | 76 |  |  |
Purchase adjustments and other | [2] | 71 | 407 |  |
Ending Goodwill at May 31 |  | 5,100 | 4,953 |  |
FedEx Ground Segment [Member] |  |  |  |  |
Net Goodwill Detail [Abstract] |  |  |  |  |
Gross Goodwill at May 31 |  |  |  |  | 827
GOODWILL |  | 827 | 827 | 840 | 827
Goodwill Roll Forward |  |  |  |  |
Beginning Goodwill at May 31 |  | 827 | 827 |  |
Goodwill acquired | [1] | 14 |  |  |
Purchase adjustments and other | [2] | (1) |  |  |
Ending Goodwill at May 31 |  | 840 | 827 |  |
FedEx Freight Segment [Member] |  |  |  |  |
Net Goodwill Detail [Abstract] |  |  |  |  |
Gross Goodwill at May 31 |  |  |  |  | 764
Accumulated impairment charges |  |  |  | (133) | (133)
GOODWILL |  | 631 | 631 | 634 | 631
Goodwill Roll Forward |  |  |  |  |
Beginning Goodwill at May 31 |  | 631 | 631 |  |
Goodwill acquired | [1] | 3 |  |  |
Ending Goodwill at May 31 |  | 634 | 631 |  |
Accumulated impairment charges |  |  |  | (133) | (133)
FedEx Services Segment [Member] |  |  |  |  |
Net Goodwill Detail [Abstract] |  |  |  |  |
Gross Goodwill at May 31 |  |  |  |  | 1,525
Accumulated impairment charges |  |  |  | (1,177) | (1,177)
GOODWILL |  | 348 | 348 | 348 | 348
Goodwill Roll Forward |  |  |  |  |
Beginning Goodwill at May 31 |  | 348 | 348 |  |
Ending Goodwill at May 31 |  | $ 348 | $ 348 |  |
Accumulated impairment charges |  |  |  | $ (1,177) | $ (1,177)
[1] | Goodwill acquired relates to the acquisitions of Northwest Research, Inc. and P2P Mailing Limited. See Note 3 for more information.
[2] | Primarily purchase-related adjustments, currency translation adjustments, and acquired goodwill related to immaterial acquisitions.
[3] | Impairment charges related to the goodwill impairment of FedEx Supply Chain described below.

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