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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Accumulated other comprehensive income [Roll Forward] |  |  |
Stockholders' equity, Beginning balance | $ 8,990 | $ 8,770 |
Stockholders' equity, Ending balance | 8,273 | 8,990 | $ 8,770
Accumulated other comprehensive income (loss) | (1,722) | (1,015) | (1,019)
Foreign currency translation |  |  |
Accumulated other comprehensive income [Roll Forward] |  |  |
Stockholders' equity, Beginning balance | (600) | (369) | (812)
Other comprehensive income (loss) | (194) | (214) | 58
Reclassified to gain/loss on sale of businesses | 0 | (17) | 385
Stockholders' equity, Ending balance | (794) | (600) | (369)
Foreign currency translation, tax | (16) | 0 | 0
Pension and postretirement |  |  |
Accumulated other comprehensive income [Roll Forward] |  |  |
Stockholders' equity, Beginning balance | (420) | (662) | (1,162)
Actuarial gains (losses) deferred during the period | (560) | 250 | 315
Amortization of deferred actuarial losses into earnings | 52 | 94 | 135
Reclassified to gain/loss on sale of businesses | 0 | 0 | 50
Stockholders' equity, Ending balance | (928) | (420) | (662)
Actuarial gains (losses) deferred during the period, tax | 165 | (76) | (170)
Amortization of deferred actuarial (gains) losses into earnings, tax | (15) | (29) | (75)
Cash flow hedges |  |  |
Accumulated other comprehensive income [Roll Forward] |  |  |
Stockholders' equity, Beginning balance | 5 | 12 | (25)
Gains (Losses) deferred during the period | (3) | 2 | 34
Reclassifications of realized (gains) losses to sales and cost of sales | (2) | (11) | 3
Stockholders' equity, Ending balance | 0 | 5 | 12
Gains (losses) deferred during the period, tax | 1 | 0 | (21)
Reclassification of (gains) losses to sales and cost of sales, tax | 0 | 4 | (2)
Accounting standards update 2018-02, early adoption [Member] | Reclassification out of accumulated other comprehensive income [Member] | Pension and postretirement |  |  |
Accumulated other comprehensive income [Roll Forward] |  |  |
Adoption of accounting standard update, accumulated other comprehensive income | 0 | (102) | 0
Accounting standards update 2018-02, early adoption [Member] | Reclassification out of accumulated other comprehensive income [Member] | Cash flow hedges |  |  |
Accumulated other comprehensive income [Roll Forward] |  |  |
Adoption of accounting standard update, accumulated other comprehensive income | $ 0 | $ 2 | $ 0

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL34724391-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e709-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109240241&loc=d3e32211-110900 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e689-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 + Details
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