Income Taxes - Income Tax Provision and Effective Income Tax Rate (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income tax provision	$ 124	$ 53	$ 176	$ 144
Effective income tax rate	32.50%	20.70%	21.10%	17.90%