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Income Taxes (Details Textuals) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes (Textuals)        
U.S. statutory federal income tax rate 35.00% 35.00% 35.00%  
Aggregate of federal taxes $ 3,000      
Income taxes paid 3,400 $ 2,500 $ 2,000  
Unrecognized tax benefits 870 909 1,044 $ 1,230
Unrecognized tax benefits as a result of potential resolutions of prior years' tax 231      
Unrecognized tax benefits that affect effective tax rate 502 412 427  
Unrecognized tax benefits, amounts recorded to equity 21      
Unrecognized tax benefits impact not possible to quantify 0      
Unrecognized tax benefits income tax penalties and interest expense (38) 19 $ 31  
Unrecognized tax benefits income tax penalties and interest accrued 164 $ 126    
Income Taxes Of Non Us Subsidiaries [Line Items]        
Accumulated earnings intended to be permanently reinvested outside the U.S. $ 9,900      
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