Significant Accounting Policies (Schedule Of Other Income, Net) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Component of Other Income, Nonoperating [Line Items]
Foreign currency exchange and hedge gains/(losses), net	$ 5	$ (10)
Net loss attributable to noncontrolling interests	1	1
Other, net	1	(25)
Total	29	27
Samsung Corning Precision Materials Co., Ltd. [Member]
Component of Other Income, Nonoperating [Line Items]
Royalty income from affiliated companies	$ 22	$ 61