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Income Taxes Changes in Tax Legislation and Statutory Tax Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Change in Tax Legislation and Statutory Tax Rates [Line Items] |  |  |  |  |  |  |
Income tax provision |  |  |  |  | $ 233 | $ (197) | $ (322)
Ireland statutory rate |  |  |  |  | 12.50% | 12.50% | 12.50%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  |  |  |  | $ 0 | $ 108 | $ 0
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability | $ 139 |  | $ 75 | $ 101 |  |  |
Maximum potential noncash impact for Swiss tax TRAF matter |  |  |  |  | $ 100 |  |
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 |
Transition Tax on Deemed Repatriated Earnings [Member] |  |  |  |  |  |  |
Change in Tax Legislation and Statutory Tax Rates [Line Items] |  |  |  |  |  |  |
Income tax provision |  | $ 305 |  |  |  | $ 216 |
United States |  |  |  |  |  |  |
Change in Tax Legislation and Statutory Tax Rates [Line Items] |  |  |  |  |  |  |
Ireland statutory rate |  |  |  |  | 21.00% | 24.50% |

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