Investments in Unconsolidated Subsidiaries (Details) (USD $) In Millions, unless otherwise specified			9 Months Ended
Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 AITA [Member]	Sep. 30, 2013 STAEM [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated subsidiaries	$ 665	$ 24
Equity Method Investment, Ownership Percentage			49.00%	25.00%
Purchase Price of Equity Method Investments			625
Accounts Receivable, Related Parties, Current	$ 85

Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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