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Income Taxes (Details Textuals) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Taxes (Textuals)        
Unrecognized tax benefits as a result of potential resolutions of prior years' tax $ 736   $ 736  
Unrecognized tax benefits, amounts recorded to equity 532   532  
Unrecognized tax benefits impact not possible to quantify 145   145  
Actual tax rates 31.80% 33.20% 31.40% 30.40%
Unrecognized tax benefits, amounts not impacting effective tax rate - temporary differences $ 59   $ 59  
Internal Revenue Service (IRS) [Member] | Earliest Year [Member]
        
Income Tax Contingency [Line Items]        
Open tax years by major tax jurisdiction     2008  
Internal Revenue Service (IRS) [Member] | Latest Year [Member]
        
Income Tax Contingency [Line Items]        
Open tax years by major tax jurisdiction     2011