Reportable Segments (Reconciliation Of Reportable Segment Net Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Current assets	$ 7,300	[1]	$ 6,602	[1]	$ 7,152	[1]
Investments	1,340	[2]	1,298	[2]	1,315	[2]
Property, net	1,494	[3]	1,283	[3]	1,255	[3]
Other non-current assets	4,140	[4]	3,774	[4]	3,659	[4]
Total Assets	29,375		27,848		25,833
Reportable Segments [Member]
Total assets	14,750		14,495		12,212
Non-Reportable Segments [Member]
Non-reportable segments	$ 351		$ 396		$ 240

[1] Includes current corporate assets, primarily cash, short-term investments and deferred taxes.

[2] Represents corporate investments in affiliated companies, at both cost and equity (primarily Dow Corning Corporation).

[3] Represents corporate property not specifically identifiable to an operating segment.

[4] Includes non-current corporate assets, pension assets and deferred taxes.