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Income Taxes Temporary Differences And Carryforwards in Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016
Income Tax Disclosure [Abstract] |  |
Deferred Tax Expense from Stock Options Exercised | $ 180 |
Deferred tax assets |  |
Accrued expenses and reserves | 891 | $ 1,175
Employee and retiree benefits | 13 | 438
Net operating loss and other credit carryforwards | 5,490 | 4,483
Research and development | 188 | 85
Joint ventures and partnerships | 0 | 49
Deferred Tax Assets, Other | 26 | 19
Gross deferred tax assets | 6,608 | 6,249
Valuation allowances | (3,838) | (3,400)
Net deferred tax assets | 2,770 | 2,849
Net deferred tax asset | 627 | 925
Deferred tax liabilities |  |
Property, plant and equipment | 247 | 87
Joint ventures and partnerships | 789 | 0
Intangible assets | 1,107 | 1,837
Net deferred tax liabilities | $ 2,143 | $ 1,924

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 + Details
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