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Business Segment Information - Schedule of Segment Information (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2018 | May 31, 2017 | May 31, 2018 | May 31, 2017 | May 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
TNT express integration expenses and restructuring charges |  |  | $ 477 | $ 327 |
MTM retirement plans accounting adjustment | $ (10) | $ (24) | (10) | (24) | $ 1,498
Goodwill and other asset impairment charges | $ 380 |  | 380 |  |
Charges for legal reserves related to U.S. CBP pending protection matters |  | 39 |  | 39 |
Ground independent contractor litigation expense |  | $ 22 |  | 22 |
U.S. CBP notice of action involving FedEx Trade Networks settlement |  |  |  |  | 69
Ground independent contractor litigation provision |  |  |  |  | 256
TNT acquisition [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Transaction and integration planning expenses |  |  |  |  | 113
Corporate, Other and Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
MTM retirement plans accounting adjustment |  |  | (10) | $ (24) | $ 1,500
TNT Express [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill and other asset impairment charges |  |  | $ 380 |  |

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