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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]  
Schedule of Income Tax Provisions
The tax provisions for the first quarter ended March 31, 2021 and 2020 were comprised of the following:
First quarter ended
 March 31,
 20212020
Pre-tax income at estimated annual effective income tax rate before discrete items$34 $53 
Other discrete items(1)(8)
Provision for income taxes$33 $45