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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, 2023 | Aug. 31, 2022
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Other retirement plans income (expense) | $ 1 | $ 2
Net income | $ 1 | $ 2

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