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Business Segments and Disaggregated Revenue - Schedule of Segment Information (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2019 | May 31, 2018 | May 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Integration expenses and restructuring charges | $ 84 | $ 69 | $ 114 | $ 121 | $ 136 | $ 106 | $ 122 | $ 112 | $ 388 | $ 477 | $ 327
Business realignment costs | $ 316 | $ 4 |  |  |  |  |  |  | 320 |  |
Goodwill and other asset impairment charges |  |  |  |  | 380 |  |  |  |  | $ 380 |
Charges for legal reserves related to U.S. CBP pending protection matters |  |  |  |  | $ 1 |  |  | $ 7 |  |  | 39
FedEx Ground Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ground independent contractor legal expense |  |  | $ 46 |  |  |  |  |  | $ 46 |  | $ 22

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