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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