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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, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Salaries and employee benefits | $ 27 | $ 30 | $ 80 | $ 90
Provision for income taxes | (7) | (7) | (19) | (21)
Net income | $ 20 | $ 23 | $ 61 | $ 69

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