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Valuation and Qualifying Accounts Schedule II (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Acquisition of businesses | $ 2,400 |  |  |
Accounts Receivable - Allowance for Doubtful Accounts |  |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at beginning of period |  | $ 182 | $ 173 | $ 70
Provision charged to costs and expenses |  | 40 | 39 | 45
Reserve adjustments |  | (24) | (9) | (8)
Accounts charged off |  | (21) | (41) | (25)
Acquisition of businesses |  | 0 | 18 | 91
Currency translation |  | 0 | 2 | 0
Balance at end of period | 173 | 177 | 182 | 173
Deferred Tax Assets - Valuation Allowance |  |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at beginning of period |  | 3,838 | 3,400 | 1,151
Acquisition of businesses |  | 0 | 53 | 2,459
Allowance provision for new operating and other loss carryforwards |  | 1,665 | 542 | 121
Allowance provision benefits |  | (308) | (157) | (331)
Balance at end of period | $ 3,400 | $ 5,195 | $ 3,838 | $ 3,400

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- Definition Amount of increase (decrease) in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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