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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2014
Jun. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Tax [Line Items]            
Income Tax Expense (Benefit) $ (1,714)   $ 613   $ (5,435) $ 1,698
Tax settlements from prior year examinations   $ (57)        
Foreign earnings repatriated       $ 2,800    
Assumed Repatriations Of Foreign Earnings [Member]            
Income Tax [Line Items]            
Deferred tax liabilities, taxes on unremitted foreign earnings       143    
Repatriated Foreign Earnings [Member]            
Income Tax [Line Items]            
Income Tax Expense (Benefit)       $ 247    
Canada And Texas Tax Rate Changes [Member]            
Income Tax [Line Items]            
Change in deferred tax expense   $ 44        
EnLink [Member]            
Income Tax [Line Items]            
Goodwill and intangibles impairments $ 799          
U.S. Asset Divestiture [Member]            
Income Tax [Line Items]            
Current income tax expense (benefit)     $ 543