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Real Estate Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Real Estate Transactions [Abstract]
Gain from sale of real estate	$ 10	$ 5	$ 10
Previously deferred gains on sales of assets included in income	4	4	3
Proceeds from sales of property, plant and equipment	$ 8	$ 2	$ 39

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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