Segment And Geographic Information (Geographic Information for Sales to External Customers and Long-lived Assets) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 2,010	$ 2,109	$ 1,979	$ 1,943	$ 1,735	$ 1,280	$ 1,086	$ 975	$ 8,041	$ 5,076	$ 4,463
Long-lived assets	6,412				6,420				6,412	6,420
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									5,739	3,526	3,133
Long-lived assets	5,668				5,783				5,668	5,783
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									432	402	394
Long-lived assets	504				401				504	401
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									653	317	196
Switzerland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									142	101	107
BRAZIL
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									108	41	16
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									104	87	46
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									96	84	90
TAIWAN, PROVINCE OF CHINA
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									96	25	0
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									671	493	$ 481
Long-lived assets	$ 240				$ 236				$ 240	$ 236