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Environmental (Schedule of Environmental Remediation Efforts) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Environmental Disclosure [Line Items]
Cost of sales	$ 5,226	$ 5,329	$ 4,738
Selling, general and administrative expenses	507	536	505
Environmental Remediation Expense [Member]
Environmental Disclosure [Line Items]
Cost of sales	10	2	1
Selling, general and administrative expenses	$ 3	$ 6	$ 8

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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