Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Valuation Allowance [Line Items]
Document Period End Date	Mar. 31, 2020
Income tax expense	$ 20	$ 8
Income Tax Expense (Benefit) associated with discrete items	1	1
Cash taxes paid	$ 10	$ 12