Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Natural gas, liquids, crude oil and carbon dioxide pipelines	$ 14,361	$ 11,628
Natural gas, liquids, carbon dioxide, and terminals station equipment	14,559	11,986
Natural gas, liquids (including linefill), and transmix processing	259	358
Other depreciable property, plant and equipment	2,045	1,713
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(6,970)	(5,817)
Net depreciable property, plant and equipment	24,254	19,868
Land	1,040	1,029
Construction in Progress, Gross	2,111	1,433
Property, Plant and Equipment, Net	27,405	22,330
Public Utilities, Property, Plant and Equipment, Common	9,034	8,954
Regulated assets as a percentage of total property plant and equipment	33.00%	40.00%
Depreciation, depletion and amortization	1,446	1,159	928
Asset Retirement Obligation	199	170
Asset Retirement Obligation, Current	25	31
Total segments [Member]
Property, Plant and Equipment [Line Items]
Depreciation, depletion and amortization	$ 1,311	$ 1,065	$ 887