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Summary of Quarterly Operating Results (Unaudited) (Parenthetical) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2018 | May 31, 2017 | May 31, 2016
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement plans mark-to-market adjustment |  | $ (10) |  |  |  | $ (24) |  |  |  | $ (10) |  | $ (24) |  | $ 1,498 |
Goodwill and other asset impairment charges |  | 380 |  |  |  |  |  |  |  | 380 |  |  |  |  |
TNT integration expenses |  | 136 | $ 106 | $ 122 | $ 112 | 124 | $ 78 | $ 58 | $ 68 |  |  |  |  |  |
Tax benefit from corporate structuring transactions |  | 255 |  |  |  |  |  |  |  | (255) | [1] | (68) | [1] | $ (76) | [1]
Tax benefits from foreign tax credits |  | 133 | 12 | $ 80 |  |  |  |  |  | 225 |  |  |  |  |
Income tax benefit related to lower statutory Income tax rate on earnings |  | $ 100 | 165 |  |  |  |  |  |  | 265 |  |  |  |  |
Provisional benefit related to remeasurement of net U.S. deferred tax liability | $ (1,150) |  | (1,150) |  |  |  |  |  |  | (1,150) |  |  |  |  |
Charges for legal reserves related to U.S. CBP pending protection matters |  |  |  |  |  | 39 |  |  |  |  |  | 39 |  |  |
Ground independent contractor litigation expense |  |  |  |  |  | $ 22 |  |  |  |  |  | 22 |  |  |
U.S. Plans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional provisional amount recognized one time benefit | 204 |  | 204 |  |  |  |  |  |  |  |  |  |  |  |
Company contributions | $ 1,500 |  | $ 1,500 |  |  |  |  |  |  | $ 2,500 |  | $ 2,000 |  |  |
[1] | The 2018 and 2017 net benefits consist of foreign deferred tax benefits of $434 million and $94 million, respectively, which were partially offset by U.S. deferred tax expenses of $179 million and $26 million, respectively.

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