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Income Taxes (Details Textuals) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Income Tax Examination [Line Items] |  |  |  |
Actual tax rates | 58.70% | 20.60% | 41.90% | 20.70%
Unrecognized tax benefits change as a result of potential resolutions of prior years' tax | $ 113 |  | $ 113 |
Unrecognized tax benefits that, if recognized, could impact effective tax rate. | $ 96 |  | $ 96 |
Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Open tax years by major tax jurisdiction |  |  | 2016 |
Internal Revenue Service (IRS) [Member] | Tax Year 2017 [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Open tax years by major tax jurisdiction |  |  | 2017 |
Internal Revenue Service (IRS) [Member] | Tax Year 2018 [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Open tax years by major tax jurisdiction |  |  | 2018 |

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