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Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
May 31, 2017 | May 31, 2016 | May 31, 2017 | May 31, 2015
Net Goodwill Detail [Abstract] |  |  |  |  |
Gross Goodwill at May 31 |  |  |  |  | $ 5,120
Accumulated impairment charges |  |  |  | $ (1,310) | (1,310)
GOODWILL |  | $ 7,154 | $ 6,747 | 7,154 | 3,810
Goodwill Roll Forward |  |  |  |  |
Beginning Goodwill at May 31 |  | 6,747 | 3,810 |  |
Goodwill acquired | [1] |  | 2,964 |  |
Purchase adjustments and other | [2] | 407 | (27) |  |
Ending Goodwill at May 31 |  | 7,154 | 6,747 |  |
Accumulated impairment charges |  |  |  | (1,310) | (1,310)
FedEx Express Segment [Member] |  |  |  |  |
Net Goodwill Detail [Abstract] |  |  |  |  |
Gross Goodwill at May 31 |  |  |  |  | 1,677
GOODWILL |  | 1,589 | 1,677 | 3,780 | 1,677
Goodwill Roll Forward |  |  |  |  |
Beginning Goodwill at May 31 |  | 1,589 | 1,677 |  |
Purchase adjustments and other | [2] | 2,191 | (88) |  |
Ending Goodwill at May 31 |  | 3,780 | 1,589 |  |
TNT Segment [Member] |  |  |  |  |
Net Goodwill Detail [Abstract] |  |  |  |  |
GOODWILL |  | 2,964 | 2,964 | 1,180 |
Goodwill Roll Forward |  |  |  |  |
Beginning Goodwill at May 31 |  | 2,964 |  |  |
Goodwill acquired | [1] |  | 2,964 |  |
Purchase adjustments and other | [2] | (1,784) |  |  |
Ending Goodwill at May 31 |  | 1,180 | 2,964 |  |
FedEx Ground Segment [Member] |  |  |  |  |
Net Goodwill Detail [Abstract] |  |  |  |  |
Gross Goodwill at May 31 |  |  |  |  | 1,145
GOODWILL |  | 1,211 | 1,145 | 1,211 | 1,145
Goodwill Roll Forward |  |  |  |  |
Beginning Goodwill at May 31 |  | 1,211 | 1,145 |  |
Purchase adjustments and other | [2] |  | 66 |  |
Ending Goodwill at May 31 |  | 1,211 | 1,211 |  |
FedEx Freight Segment [Member] |  |  |  |  |
Net Goodwill Detail [Abstract] |  |  |  |  |
Gross Goodwill at May 31 |  |  |  |  | 773
Accumulated impairment charges |  |  |  | (133) | (133)
GOODWILL |  | 635 | 640 | 635 | 640
Goodwill Roll Forward |  |  |  |  |
Beginning Goodwill at May 31 |  | 635 | 640 |  |
Purchase adjustments and other | [2] |  | (5) |  |
Ending Goodwill at May 31 |  | 635 | 635 |  |
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 acquisition of TNT Express in 2016. See Note 3 for related disclosures.
[2] | Primarily purchase-related adjustments, currency translation adjustments, and acquired goodwill related to immaterial acquisitions. FY17 includes goodwill attributed to FedEx Express as part of the acquisition of TNT Express.

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