Significant Accounting Policies Level 4 (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018	Dec. 31, 2015
Unrealized gains (losses) on pension and OPEB plan liabilities		$ (13)	$ (4)	$ 34
Net Cash Provided by (Used in) Investing Activities		(40)	(110)	219
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		(5)	8	(4)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect		13	(81)	(40)
Cash and cash equivalents (including restricted cash of $15 and $18, respectively)		128	115
Restricted Cash			18	17		$ 8
Revenues		3,797	3,591	3,438
Finished and in-process goods		240	221
Operating Income (Loss)		227	100	272
Selling, general and administrative expense		295	321	318
Foreign Currency Transaction Gain (Loss), before Tax		30	4	10
Interest-bearing time deposits and other cash equivalents		31	9
Inventory Valuation Reserves		9	9
Unamortized debt issuance costs - assets		4	8
Depreciation		103	103	119
Accelerated Depreciation		4	14	129
Asset Impairment Charges		28	13	0
Research and Development Expense		53	58	59
Business realignment costs		$ 29	52	55
Concentration Risk, Percentage		10.00%
restricted cash		$ 15	18
Net Benefit Cost, non-service costs		(22)	(13)	29
Other current assets		57	44		$ 56
Accumulated deficit		(3,125)	(2,964)		(2,963)
Cost of Goods and Services Sold		3,226	3,088	3,020
Gross Profit		571	503	418
Other non-operating (income) expense, net		(12)	(12)	21
Inventory, Net					$ 210
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		128	115	196		236
Goodwill, Impairment Loss	$ 13		(13)
EPCD [Member]
Revenues		2,115	2,052	2,094
Goodwill, Impairment Loss			(13)
FPD [Member]
Revenues		$ 1,682	1,539	1,344
Goodwill, Impairment Loss			0
Building [Member]
Property, Plant and Equipment, Useful Life		20 years
Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life		15 years
Minimum [Member]
Operating Lease, Right-of-Use Asset		$ 95
Property, Plant and Equipment, Useful Life		1 year
Finite-Lived Intangible Asset, Useful Life		1 year
Maximum [Member]
Operating Lease, Right-of-Use Asset		$ 115
Property, Plant and Equipment, Useful Life		5 years
Finite-Lived Intangible Asset, Useful Life		30 years
Previous Accounting Guidance [Member]
Revenues		$ 3,797
Operating Income (Loss)			112	244
Selling, general and administrative expense			307	328
Other assets, current under previous accounting guidance		46
Accumulated deficit under previous accounting guidance		(3,127)
Cost of Goods and Services Sold		3,227	3,090	3,038
Gross Profit		570	501	400
Other non-operating (income) expense, net			0	7
Inventory, Net		249
Adjustments for New Accounting Pronouncement [Member]
Increase (Decrease) in Restricted Cash			(1)	9
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents			2	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect			1	9
Contract with Customer, Asset, Net		11
Revenues		0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results			(12)	28
Selling, general and administrative expense			14	(10)
Other current assets			12
Accumulated deficit		2	1
Cost of Goods and Services Sold		(1)	(2)	(18)
Gross Profit		1	2	18
Other non-operating (income) expense, net			12	(28)
Inventory, Net		$ (9)	(11)
Previous Accounting Guidance [Member]
Increase (Decrease) in Restricted Cash			1	(9)
Net Cash Provided by (Used in) Investing Activities			(109)	210
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents			6	(4)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect			(82)	(49)
Cash and cash equivalents (including restricted cash of $15 and $18, respectively)			$ 97	$ 179		$ 228