Acquisitions and Exit Activities (Exit Activities) (Details) - Facility Closing $ in Millions		12 Months Ended
	Dec. 17, 2015 USD ($) employee	Dec. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Pre-tax non-cash impairment charge	$ 111		$ 111
Charge to fully impair long-lived assets	$ 96
Number of employees related to workforce reduction | employee	170
Severance expense	$ 3
Other expenses, including write downs of inventory	$ 12
Accrual related to exit activities		$ 1
Expected future cash payments on exit activities		$ 4