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Income Taxes (Details Textuals) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Income Tax Examination [Line Items] |  |  |  |  |
Actual tax rates | 22.60% | 21.90% | 21.40% | 21.90% |
Unrecognized tax benefits change as a result of potential resolutions of prior years' tax | $ 83 |  | $ 83 |  |
Unrecognized tax benefits that, if recognized, could impact effective tax rate. | $ 65 |  | $ 65 |  |
Earliest Year [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Audit Settlement Years |  |  |  |  | 2008
Open tax years by major tax jurisdiction |  |  | 2016 |  |
Latest Year [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Audit Settlement Years |  |  |  |  | 2014

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