Segment Information Level 4 (Details) - Total Assets by Segment (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Total Assets by Segment [Line Items]
Assets	$ 1,961	$ 2,097
EPCD [Member]
Total Assets by Segment [Line Items]
Assets	1,031	1,100
FPD [Member]
Total Assets by Segment [Line Items]
Assets	779	880
Corporate and Other [Member]
Total Assets by Segment [Line Items]
Assets	$ 151	$ 117