Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income Taxes (Textual) [Abstract]
Income Tax Expense	$ 5,570	$ 4,883
Effective Tax Rates	46.00%	44.00%
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