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Trade Accounts Receivable Securitization and Sale Programs (Securitization Activity) (Details 3) - Asset Backed Securitizations [Member] - USD ($)
$ in Millions
 3 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Trade Accounts Receivable Securitization and Sale Program [Line Items]    
Eligible trade accounts receivable sold during the three months ended $ 2,392 $ 2,343
Cash proceeds received during the three months ended [1] 1,628 1,575
Pre-tax loss on sale of receivables during the three months ended [2] 4 2
Deferred purchases price receivables as of November 30 [3] $ 760 $ 766
[1]

(1) For the three months ended November 30, 2017 and 2016 , the amount represented proceeds from collections reinvested in revolving-period transfers as there were no new transfers during the period.

[2]

(2) Recorded to other expense within the Condensed Consolidated Statements of Operations.

[3]

(3) R ecorded initially at fair value as prepaid expenses and other current assets on the Condensed Consolidated Balance Sheets and are valued using unobservable inputs (Level 3 inputs), primar ily discounted cash flows, and due to their credit quality and short-term maturity the fair values approximated book values. The unobservable inputs consist of estimated credit losses and estimated discount rates, which both have an immaterial impact on th e fair value calculation s.