Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate, continuing operations	34.70%	28.60%
Tax expense on gain from commercial settlement		$ 1
Tax benefits related to restructuring expense	$ 3	$ 1
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount	5
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ 22