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Acquisitions and Discontinued Operations Divestitures and Discontinued Operations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Mar. 14, 2013
Express Pipeline System [Member]
Kinder Morgan Energy Partners, L.P. [Member]
Equity method investment & Suboordinated debt investment [Member]
Spectra Energy Corp. [Member]
KMP Sale of Express Pipeline System [Member]
Sep. 30, 2013
Express Pipeline System [Member]
Kinder Morgan Energy Partners, L.P. [Member]
Equity method investment & Suboordinated debt investment [Member]
Spectra Energy Corp. [Member]
KMP Sale of Express Pipeline System [Member]
Jun. 30, 2013
Express Pipeline System [Member]
Kinder Morgan Energy Partners, L.P. [Member]
Equity method investment & Suboordinated debt investment [Member]
Spectra Energy Corp. [Member]
KMP Sale of Express Pipeline System [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from Sale of Equity Method Investments         $ 402    
Working Capital Settlement and Selling Expenses           1  
Proceeds from sale of investments in Express pipeline system     0 (403)     (403)
Gain on Sale of Investments             225
Tax expense on sale of investments 24 26 40 127     84
Equity Method Investments         67    
Notes Receivable, Related Parties         $ 110