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Income Taxes (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Sep. 30, 2013
Jun. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2014
Income Tax [Line Items]              
Current income tax expense (benefit)       $ 100,000,000      
Foreign earnings repatriated   2,800,000,000   2,000,000,000      
Deferred tax liabilities, taxes on unremitted foreign earnings   143,000,000          
Deferred tax liability on formation of EnLink             48,000,000
Income tax expense (benefit) 613,000,000   210,000,000   1,698,000,000 (99,000,000)  
Repatriated Foreign Earnings [Member]
              
Income Tax [Line Items]              
Income tax expense (benefit)   247,000,000          
U.S. Non-Core Asset Divestiture [Member]
              
Income Tax [Line Items]              
Current income tax expense (benefit) $ 543,000,000