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Income Taxes (Details Textuals) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Income Tax Examination [Line Items] |  |
Actual tax rates | 18.80% | 20.80%
Unrecognized tax benefits change as a result of potential resolutions of prior years' tax | $ 113 |
Unrecognized tax benefits that, if recognized, could impact effective tax rate. | $ 96 |
Earliest Year [Member] | Internal Revenue Service (IRS) [Member] |  |
Income Tax Examination [Line Items] |  |
Open tax years by major tax jurisdiction | 2016 |

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