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Income, Sales-Based And Other Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income, Sales-Based And Other Taxes [Abstract]      
Net deferred income tax expense (credits)/charges for tax rate and law changes $ 177,000,000 $ (40,000,000) $ (310,000,000)
Reconciliation between income tax expense and theoretical U.S. tax rate, statutory rate 35.00% 35.00% 35.00%
Indefinitely reinvested, undistributed earnings from subsidiary companies outside the U.S. $ 51,000,000,000    
Potential percentage increase in unrecognized tax benefits 20.00%    
Credit of net interest expense on income tax reserves     $ 207,000,000
Interest expense on income tax reserves $ 39,000,000 $ 42,000,000  
Interest payable on income tax reserves 223,000,000 205,000,000  
Asset valuation allowances 1,730,000,000 $ 2,570,000,000  
Valuation allowance change from 2014 to 2015 (840,000,000)    
Change in net provisions [Member]      
Valuation allowance change from 2014 to 2015 (681,000,000)    
Effects of foreign currency translation [Member]      
Valuation allowance change from 2014 to 2015 $ (159,000,000)