Operating Segment Information - Revenues and Long-Lived Assets By Geographic Area (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues and long-lived assets
Revenue		$ 464	$ 526	$ 578	$ 562	$ 484	$ 533	$ 626	$ 622	$ 2,130	$ 2,265	$ 2,209
Property, plant and equipment, net	[1]	989				994				989	994
United States
Revenues and long-lived assets
Revenue										500	518	526
Property, plant and equipment, net		104				111				104	111
Germany
Revenues and long-lived assets
Revenue										234	257	230
Property, plant and equipment, net		279				263				279	263
China
Revenues and long-lived assets
Revenue										126	131	112
Italy
Revenues and long-lived assets
Revenue										111	126	126
Property, plant and equipment, net		163				164				163	164
United Kingdom
Revenues and long-lived assets
Revenue										110	116	114
Property, plant and equipment, net		189				180				189	180
Spain
Revenues and long-lived assets
Revenue										92	96	86
France
Revenues and long-lived assets
Revenue										78	89	94
India
Revenues and long-lived assets
Revenue										62	65	63
Other nations
Revenues and long-lived assets
Revenue										817	867	$ 858
Property, plant and equipment, net		208				207				208	207
Finland
Revenues and long-lived assets
Property, plant and equipment, net		$ 46				$ 69				$ 46	$ 69

[1] At December 31, 2019 and December 31, 2018, the following amounts from consolidated variable interest entities are included in the respective balance sheet captions above: $2 and $5 of cash and cash equivalents; $4 and $5 of accounts receivable, net; $2 and $1 of inventories; $5 each of property, plant and equipment, net; $1 and nil of operating lease right-of-use assets; $11 and $14 of intangible assets, net; $1 each of accounts payable; $3 and $4 of accrued liabilities; $1 and nil of operating lease liabilities; and nil and $2 of current portion of debt. See "Note 9. Variable Interest Entities."