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Income Taxes Changes in Tax Legislation and Statutory Tax Rates (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018
Change in Tax Legislation and Statutory Tax Rates [Line Items] |  |  |  |  |  |
Income tax provision | $ 47 | $ 36 |  | $ 155 | $ 253 | $ (108)
Transition Tax on Deemed Repatriated Earnings [Member] |  |  |  |  |  |
Change in Tax Legislation and Statutory Tax Rates [Line Items] |  |  |  |  |  |
Income tax provision |  |  | $ 305 |  |  | 216
Remeasurement of U.S. deferred tax assets and liabilities [Member] |  |  |  |  |  |
Change in Tax Legislation and Statutory Tax Rates [Line Items] |  |  |  |  |  |
Income tax provision |  |  | $ (101) |  |  | $ (108)

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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