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Income Taxes (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Effective tax rate 1.00% 22.00% 1.00% 20.00%  
U.S. statutory tax rate     21.00% 35.00%  
Tax Cuts and Jobs Act transition tax expense         $ 4,500,000,000
Tax Cuts and Jobs Act net tax benefit from the remeasurement of deferred taxes         $ 4,100,000,000
Tax Cuts and Jobs Act adjustments to provisional estimates $ 0   $ 0    
Potential change in unrecognized tax benefits $ 550,000,000   $ 550,000,000