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Income Taxes (Details Textuals) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Taxes Of Non Us Subsidiaries [Line Items]        
Accumulated earnings intended to be permanently reinvested outside the U.S. $ 10,400      
Income Taxes [Line items]        
U.S. statutory federal income tax rate 35.00% 35.00% 35.00%  
Aggregate of federal taxes $ 3,200      
Income taxes paid 3,000 $ 3,400 $ 2,500  
Unrecognized tax benefits 974 870 909 $ 1,044
Unrecognized tax benefits as a result of potential resolutions of prior years' tax 449      
Unrecognized tax benefits that affect effective tax rate 516 502 412  
Unrecognized tax benefits, amounts recorded to equity 309      
Unrecognized tax benefits impact not possible to quantify 0      
Unrecognized tax benefits income tax penalties and interest expense 9 38 $ (19)  
Unrecognized tax benefits income tax penalties and interest accrued 173 $ 164    
Tax Benefit Recognized In Subsequent Period $ 289      
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 2014