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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]        
Effective tax rate (as a percent) 27.00% 27.00% 26.00% 25.00%
Income tax reconciliation, share-based compensation cost       $ 9