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Valuation and Qualifying Accounts Schedule II (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Accounts Receivable - Allowance for Doubtful Accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 169 | $ 172 | $ 168
Provision charged to costs and expenses | 37 | 14 | 25
Accounts charged off, net of recoveries | (21) | (17) | (41)
Valuation Allowances and Reserves, Reserves of Business Acquired (Divested) | (10) | 0 | 18
Currency translation | (2) | 0 | 2
Balance at end of period | 173 | 169 | 172
Deferred Tax Assets - Valuation Allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 5,088 | 3,735 | 3,290
Acquisition (divestiture) of businesses | 0 | 0 | 53
Allowance provision for new operating and other loss carryforwards | 195 | 1,639 | 550
Allowance provision benefits | (215) | (286) | (158)
Balance at end of period | $ 5,068 | $ 5,088 | $ 3,735

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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