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Income Taxes (Details Textuals) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Tax Examination [Line Items]        
Actual tax rates 21.30% 22.60% 30.40% 21.40%
Unrecognized tax benefits change as a result of potential resolutions of prior years' tax $ 106   $ 106  
Unrecognized tax benefits that, if recognized, could impact effective tax rate. $ 90   $ 90  
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