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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Taxes (Textual) [Abstract]
Income tax expense	$ 4,624	$ 5,483	$ 15,317	$ 15,813
Effective tax rates	47.00%	41.00%	45.00%	42.00%
Period for developments on tax matters in certain tax jurisdictions may result in significant increases or decreases in the company's total unrecognized tax benefits (in months)			12 months

- 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.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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