Segment Information Level 4 (Details) - Total Assets by Segment (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Total Assets by Segment [Line Items]
Assets	$ 2,097	$ 2,055
EPCD [Member]
Total Assets by Segment [Line Items]
Assets	1,100	1,002
FPD [Member]
Total Assets by Segment [Line Items]
Assets	880	840
Corporate and Other [Member]
Total Assets by Segment [Line Items]
Assets	$ 117	$ 213