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General - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Oct. 13, 2017 | Nov. 30, 2017 | Nov. 30, 2016 | Nov. 30, 2017 | Nov. 30, 2016
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Stock-based compensation |  | $ 41 | $ 36 | $ 103 | $ 93
Lease liability and related right-of-use asset |  | 13,000 |  | 13,000 |
Operating income |  | $ 1,262 | 1,167 | $ 2,379 | 2,431
Stock Repurchase Program Number Of Shares Authorized To Be Repurchased |  | 25,000,000 |  | 25,000,000 |
Number of Shares Repurchased |  | 800,000 |  | 1,200,000 |
Treasury Stock Acquired, Average Cost Per Share |  | $ 220.67 |  | $ 216.45 |
Payments for Repurchase of Common Stock |  | $ 184 |  | $ 270 | 334
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  | 14,800,000 |  | 14,800,000 |
Dividends Payable, Date Declared |  | Nov. 17, 2017 |  |  |
Dividends Payable Amount Per Share |  | $ 0.50 |  | $ 0.50 |
Dividends Payable, Date To Be Paid |  | Jan. 02, 2018 |  |  |
Dividends Payable, Date Of Record |  | Dec. 11, 2017 |  |  |
ASU 201703 [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Operating income |  | $ 146 | $ 112 | $ 292 | $ 224
Northwest Research, Inc. [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Cash paid for acquisition of business | $ 50 |  |  |  |

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