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General - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 13, 2017 | Feb. 28, 2018 | Feb. 28, 2017 | Feb. 28, 2018 | Feb. 28, 2017 | Jan. 26, 2016
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |
Stock-based compensation |  | $ 32 | $ 31 | $ 135 | $ 123 |
Operating income |  | 1,001 | 1,025 | 3,380 | 3,456 |
Lease liability and related right-of-use asset |  | $ 13,000 |  | $ 13,000 |  |
Stock Repurchase Program Number Of Shares Authorized To Be Repurchased |  |  |  |  |  | 25,000,000
Number of Shares Repurchased |  | 1,200,000 |  | 2,400,000 |  |
Treasury Stock Acquired, Average Cost Per Share |  | $ 248.73 |  | $ 232.00 |  |
Payments for Repurchase of Common Stock |  | $ 288 |  | $ 558 | 358 |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  | 13,600,000 |  | 13,600,000 |  |
Dividends Payable, Date Declared |  | Feb. 16, 2018 |  |  |  |
Dividends Payable Amount Per Share |  | $ 0.50 |  | $ 0.50 |  |
Dividends Payable, Date To Be Paid |  | Apr. 02, 2018 |  |  |  |
Dividends Payable, Date Of Record |  | Mar. 12, 2018 |  |  |  |
ASU 201703 [Member] |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |
Operating income |  | $ 143 | $ 113 | $ 436 | $ 337 |
Northwest Research, Inc. [Member] |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |
Cash paid for acquisition of business | $ 50 |  |  |  |  |

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