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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 | 9 Months Ended
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Feb. 29, 2024 | Feb. 28, 2023 | Feb. 29, 2024 | Feb. 28, 2023
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other retirement plans income (expense) | $ 2 | $ 3 | $ 5 | $ 7
Provision for income taxes |  |  |  | (1)
Net income | $ 2 | $ 3 | $ 5 | $ 6

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