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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