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Accumulated Other Comprehensive Loss - Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] - USD ($) $ in Millions | 3 Months Ended
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Aug. 31, 2020 | Aug. 31, 2019
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Other retirement plans (expense) income | $ 3 | $ 27
Provision for income taxes | (1) | (6)
Net income | $ 2 | $ 21

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