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Summary of Significant Accounting Policies (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2017 | Nov. 30, 2017 | Nov. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Excess tax benefit, amount | $ 34 | $ 122 |
Cash inflow (outflow) from operations |  | 1,898 | $ 1,770
Cash inflow (outflow) from financing activities |  | $ (1,214) | (766)
Accounting Standard Update 2016-09, Excess Tax Benefit Component |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cash inflow (outflow) from operations |  |  | 78
Cash inflow (outflow) from financing activities |  |  | (78)
Accounting Standard Update 2016-09, Statutory Tax Withholding Component |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cash inflow (outflow) from operations |  |  | 8
Cash inflow (outflow) from financing activities |  |  | $ (8)

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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3574-108585 + Details
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