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Acquisitions and Divestitures Investment Divestiture (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 14, 2013
Business Acquisition [Line Items]        
Proceeds from sales of assets and investments $ 0 $ 0 $ 490  
Income Tax Expense (564) (648) (742)  
Equity Method Investments $ 6,032 $ 6,028    
Express Pipeline System and Subordinated Debenture Investments [Member] | Spectra Energy Corp. [Member]        
Business Acquisition [Line Items]        
Proceeds from sales of assets and investments     402  
Equity Method Investment, Realized Gain (Loss) on Disposal     224  
Income Tax Expense     $ (84)  
Kinder Morgan Energy Partners, L.P. [Member] | Express Pipeline System [Member]        
Business Acquisition [Line Items]        
Equity Method Investment, Ownership Percentage       33.33%