Income Taxes (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate, continuing operations	29.20%	20.70%
Tax expense on gain from commercial settlement		$ 1
Tax benefits related to restructuring expense	$ 11	10
Effective rate reconciliation measurement period adjustments due to the Tax Act		20
Effective income tax reconciliation, other postretirement expense	6
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount	13	11
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ 22
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount		$ 22