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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Income Tax Examination [Line Items] |  |  |  |  |
Goodwill impairment | $ 2 |  |  |  |
Change in valuation allowance |  | $ 100 |  |  | $ 100
Income tax provision |  |  | $ 57 | $ 410 | 480
Foreign tax authority | Ireland |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax expense at Ireland statutory rate |  |  | (54) | 0 | (140)
State and local income taxes, net of federal benefit |  |  | (30) | (41) | (60)
Foreign tax rate differential |  |  | (127) | (109) | (146)
Notional interest deduction |  |  | (44) | (63) | (66)
Credits and incentives |  |  | (7) | (9) | (13)
Goodwill impairment |  |  | 9 | 0 | (21)
Repatriation of foreign earnings |  |  | 18 | 31 | 36
Foreign exchange |  |  | (1) | 2 | 3
Impact of enacted tax rate changes |  |  | (3) | (5) | 23
Impact of U.S. tax reform |  |  | 0 | 0 | 210
Change in uncertain tax positions |  |  | 56 | 107 | 97
Change in valuation allowance |  |  | 332 | 503 | 554
Impairment of subsidiaries |  |  | (24) | (3) | 0
Tax impact of corporate equity transactions |  |  | (77) | 0 | 0
Other |  |  | 9 | (3) | 3
Income tax provision |  |  | $ 57 | $ 410 | $ 480

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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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