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Income Taxes
3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
 Quarter ended
 20212020
Income tax provision$83 $12 
Effective tax rate20.2 %12.5 %

The increase in our effective tax rate for the first quarter 2021 as compared with the first quarter 2020 is primarily due to a reduction in the rate impact of the benefit associated with excess tax benefits on share-based compensation due to pre-tax earnings being significantly lower in the first quarter 2020 as compared to the first quarter 2021.