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General - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2017 | Aug. 31, 2016
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Stock-based compensation | $ 62 | $ 57
Lease liability and related right-of-use asset | 13,000 |
Operating income | $ 1,117 | 1,264
Stock Repurchase Program Number Of Shares Authorized To Be Repurchased | 25,000,000 |
Number of Shares Repurchased | 400,000 |
Treasury Stock Acquired, Average Cost Per Share | $ 207.92 |
Payments for Repurchase of Common Stock | $ 86 | 222
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 15,600,000 |
Dividends Payable, Date Declared | Aug. 18, 2017 |
Dividends Payable Amount Per Share | $ 0.50 |
Dividends Payable, Date To Be Paid | Oct. 02, 2017 |
Dividends Payable, Date Of Record | Sep. 11, 2017 |
ASU 201703 [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Operating income | $ 146 | $ 112

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