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Basis of Presentation and Accounting Policies (Details Textual) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Additional Basis of Presentation and Accounting Policies (Textual) [Abstract]
Total stockholders' equity	$ 20,920	$ 22,447	$ 21,274
Basis of Presentation and Accounting Policies (Textual) [Abstract]
Unrecognized tax benefits	48
Valuation Allowance	51	58
Deferred income taxes, net	$ 2,667	$ 1,942

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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