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Income Taxes (Reconciliations of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Beginning balance | $ 190 | $ 164 | $ 257
Additions for tax positions of prior years | 15 | 10 | 20
Reductions for tax positions of prior years | (3) | (9) | (106)
Additions for tax positions related to current year | 36 | 27 | 36
Cash settlements | 0 | (1) | 0
Reductions from lapses in statutes of limitations | (2) | (1) | (3)
Reductions from non-cash settlements with taxing authorities | 0 | (2) | (36)
Foreign exchange rate adjustment | 5 | 2 | (4)
Ending balance | 241 | 190 | 164
Unrecognized tax benefits that would affect the effective tax rate (if recognized) | $ 139 | $ 109 | $ 93

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- Definition Amount of increase (decrease) in unrecognized tax benefits resulting from foreign exchange rate adjustments. + References No definition available. + Details
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- Definition The gross amount of decreases in unrecognized tax benefits resulting from cash settlements. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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