Reportable Segments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Gain on remeasurement of previously held equity interest in Eagle Ford to fair value (Note 2)	$ 0	$ 0	$ 0	$ 558
Revenues	4,291	3,756	12,275	10,198
Total segment depreciation, depletion and amortization	(520)	(467)	(1,518)	(1,327)
Total segment amortization of excess cost of investments	(12)	(11)	(33)	(29)
General and administrative expenses(c)	(135)	(158)	(461)	(481)
Unallocable Interest Expense Net Of Interest Income	(431)	(420)	(1,325)	(1,257)
Unallocable income tax expense	(229)	(159)	(583)	(554)
Loss from discontinued operations, net of tax	0	0	0	(2)
Net income	779	551	1,877	1,988
Assets	77,118		77,118		75,185
Natural Gas Pipelines [Member]
Segment Reporting Information [Line Items]
Revenues	2,745	2,388	7,766	6,197
Segment earnings before DD&A	1,182	958	3,208	3,281
Assets	52,513		52,513		52,357
CO2 [Member]
Segment Reporting Information [Line Items]
Revenues	508	456	1,445	1,345
Segment earnings before DD&A	388	340	1,083	1,040
Assets	4,926		4,926		4,708
Products Pipelines [Member]
Segment Reporting Information [Line Items]
Rate Reparations Refunds And Other Litigation and Environmental Reserve Adjustment, Expense Portion				177
Revenues	520	474	1,578	1,371
Segment earnings before DD&A	222	202	632	399
Assets	7,045		7,045		6,648
Terminals [Member]
Segment Reporting Information [Line Items]
Revenues	433	354	1,244	1,034
Segment earnings before DD&A	249	217	696	609
Assets	8,468		8,468		6,888
Kinder Morgan Canada [Member]
Segment Reporting Information [Line Items]
Revenues	73	74	210	221
Segment earnings before DD&A	50	43	138	286
Assets	1,620		1,620		1,677
All Other Segments [Member]
Segment Reporting Information [Line Items]
Revenues	3	1	5	3
Segment earnings before DD&A	6	(3)	13	(4)
Assets	532		532		568
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	4,288	3,749	12,260	10,175
Segment earnings before DD&A	2,097	1,757	5,770	5,611
Assets	75,104		75,104		72,846
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	2,014		2,014		2,339
Unallocated [Member]
Segment Reporting Information [Line Items]
Revenues	9	9	27	27
Intersegment Revenues [Member] | Natural Gas Pipelines [Member]
Segment Reporting Information [Line Items]
Revenues	6	2	11	3
Intersegment Revenues [Member] | Terminals [Member]
Segment Reporting Information [Line Items]
Revenues	0	0	1	1
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(6)	(2)	(12)	(4)
Express Pipeline System [Member] | Kinder Morgan Canada [Member]
Segment Reporting Information [Line Items]
Increase in earnings from after tax sale of investments		(1)		140
Kinder Morgan Louisiana Pipeline [Member] | Natural Gas Pipelines [Member]
Segment Reporting Information [Line Items]
Gain (Loss) on Contract Termination	198		198
Copano Energy LLC [Member] | Other Income (Expense) [Member] | Eagle Ford Gathering LLC [Member] | Kinder Morgan Energy Partners, L.P. [Member] | Natural Gas Pipelines [Member]
Segment Reporting Information [Line Items]
Gain on remeasurement of previously held equity interest in Eagle Ford to fair value (Note 2)				$ 558