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Summary of Quarterly Operating Results (Unaudited) (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2020 | Feb. 29, 2020 | Nov. 30, 2019 | Aug. 31, 2019 | May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2020 | May 31, 2019 | May 31, 2018
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Retirement plans mark-to-market adjustment | $ 794 |  |  |  | $ 3,900 |  |  |  | $ 794 | $ 3,882 | $ (10)
Integration expenses | 63 | $ 72 | $ 64 | $ 71 | 84 | $ 69 | $ 114 | $ 121 | 270 | 388 | 477
Goodwill and other asset impairment charges |  |  | 66 |  |  |  |  |  | 435 |  | 380
Benefit from reduction of valuation allowance on tax loss carryforwards |  |  | $ 133 |  |  | 90 |  |  | 133 | 90 |
Deferred income tax expense | 51 |  |  |  |  |  |  |  | 348 | (85) | (183)
PROVISION FOR INCOME TAXES (BENEFIT) |  |  |  |  |  |  |  |  | 383 | 115 | $ (219)
Business realignment costs |  |  |  |  | $ 316 | 4 |  |  |  | 320 |
Income tax benefit from accelerated deductions to be claimed on 2018 tax return |  |  |  |  |  |  | 60 |  |  | (75) |
Increase (Decrease) in Income Taxes |  |  |  |  |  |  | 4 |  |  |  |
Netherlands [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
PROVISION FOR INCOME TAXES (BENEFIT) |  |  |  |  |  | $ 50 |  |  |  |  |
CARES Act [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
PROVISION FOR INCOME TAXES (BENEFIT) | (71) |  |  |  |  |  |  |  | $ (71) |  |
FedEx Office and FedEx Logistics Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill and other asset impairment charges | $ 369 |  |  |  |  |  |  |  |  |  |
FedEx Ground Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Settlement of a legal matter |  |  |  |  |  |  | $ 46 |  |  | $ 46 |

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