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Income Taxes (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Taxes (Textuals)
Unrecognized tax benefits as a result of potential resolutions of prior years' tax	$ 886
Unrecognized tax benefits, amounts recorded to equity	682
Unrecognized tax benefits impact not possible to quantify	204
Tax Benefits		$ 50
Actual tax rates	32.90%	29.20%
Internal Revenue Service (IRS) [Member] | Earliest Year [Member]
Income Tax Contingency [Line Items]
Open tax years by major tax jurisdiction	2005
Internal Revenue Service (IRS) [Member] | Latest Year [Member]
Income Tax Contingency [Line Items]
Open tax years by major tax jurisdiction	2007

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Unrecognized tax benefits relating to amounts recorded to equity that, if recognized, would not impact the effective rate.

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Represents the remaining decrease or increase in unrecognized tax benefits within the next 12 months for which it is not possible to quantify the impact of the increase or decrease on the effective tax rate and net income.

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- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

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-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 47

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-Name Accounting Standards Codification

-Topic 235

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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Reflects the effects of adjustments of previously recorded tax expense, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, IRS tax settlement and unusual repatriation of foreign earnings.

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