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Income Taxes
 3 Months Ended
Mar. 31, 2024
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
Income tax expense was $61 million and $66 million for the three months ended March 31, 2024 and 2023, respectively. The effective tax rate, expressed by calculating the income tax expense as a percentage of Income before income taxes, was 21.9% and 22.3% for the three months ended March 31, 2024 and 2023, respectively.
The effective tax rate for both the three months ended March 31, 2024 and March 31, 2023 differed from the US federal statutory rate of 21.0% primarily due to state and local income taxes, partially offset by excess tax benefits on equity-based compensation.