Segment Information (Schedule of Geographical Segments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 5,655	$ 6,297	$ 7,155
Property, plant and equipment, net	3,939	3,713
Lanaken, Belgium
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	274	259	261
Property, plant and equipment, net	60	55
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	68	75	115
Property, plant and equipment, net	99	105
CHINA
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	888	859	1,070
Property, plant and equipment, net	406	316
GERMANY
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	1,837	2,132	2,335
Property, plant and equipment, net	914	866
MEXICO
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	200	244	307
Property, plant and equipment, net	57	57
SINGAPORE
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	627	787	997
Property, plant and equipment, net	76	80
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	1,490	1,713	1,769
Property, plant and equipment, net	2,155	2,095
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	190	228	301
Property, plant and equipment, net	172	139
SWITZERLAND
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 81	$ 0	$ 0