Trade Accounts Receivable Securitization and Sale Programs - Asset-Backed Securitization Programs Amounts Recognized (Details) - Asset-Backed Securitization Programs - USD ($) $ in Millions	3 Months Ended	9 Months Ended
May 31, 2018	May 31, 2017	May 31, 2018	May 31, 2017
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Eligible trade accounts receivable sold	$ 1,913	$ 2,069	$ 6,362	$ 6,568
Cash proceeds received	1,379	1,565	5,821	6,060
Pre-tax losses on sale of receivables	4	3	11	7
Deferred purchase price receivables as of May 31	$ 530	$ 501	$ 530	$ 501

Portion of the purchase price for the securitized receivables which is not paid in cash upon the sale taking place.

No definition available.

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Period Type:	instant

- Definition

Value of trade accounts receivable sold during the period under the asset-backed securitization and sales programs.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Trade Accounts Receivable Securitization and Sale Program [Line Items]

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

Cash Flows between a transferor and a transferee attributable to collections reinvested in revolving period transfers related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Reflects, by transferred financial asset type, the amount of sales proceeds in excess of or deficient from the sum of the carrying amounts of transferred financial assets plus transaction costs, including those transactions in which the seller/transferor has continuing involvement with the financial assets that have been transferred.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=d3e107207-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 10
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=65892426&loc=d3e96813-111708

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Period Type: