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Income Taxes Valuation Allowance, Additional Details (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | $ (76) |  |  | $ (284) | $ 31 | $ (164)
Valuation Allowance, Deferred Tax Asset, Increase, Amount |  | $ 56 | $ 27 |  |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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