Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 2,953	$ 3,353	$ 9,096	$ 9,924
Other revenues	261	164	761	439
Total revenues	3,214	3,517	9,857	10,363
Natural Gas Pipelines
Disaggregation of Revenue [Line Items]
Total revenues	1,925	2,180	6,073	6,391
Products Pipelines
Disaggregation of Revenue [Line Items]
Total revenues	484	475	1,350	1,420
Terminals
Disaggregation of Revenue [Line Items]
Total revenues	507	503	1,521	1,512
CO2
Disaggregation of Revenue [Line Items]
Total revenues	298	316	913	870
Kinder Morgan Canada
Disaggregation of Revenue [Line Items]
Total revenues	0	44	0	170
Operating Segments | Natural Gas Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,844	2,157	5,840	6,264
Other revenues	90	35	263	161
Total revenues	1,934	2,192	6,103	6,425
Operating Segments | Products Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	438	435	1,216	1,302
Other revenues	46	40	134	118
Total revenues	484	475	1,350	1,420
Operating Segments | Terminals
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	397	404	1,199	1,227
Other revenues	111	100	325	287
Total revenues	508	504	1,524	1,514
Operating Segments | CO2
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	283	330	874	1,000
Other revenues	15	(14)	39	(130)
Total revenues	298	316	913	870
Operating Segments | Kinder Morgan Canada
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		41		167
Other revenues		3		3
Total revenues		44		170
Corporate and eliminations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(9)	(14)	(33)	(36)
Other revenues	(1)	0	0	0
Total revenues	(10)	(14)	(33)	(36)
Firm services
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,227	1,146	3,737	3,526
Firm services | Operating Segments | Natural Gas Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	882	819	2,701	2,490
Firm services | Operating Segments | Products Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	89	95	253	286
Firm services | Operating Segments | Terminals
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	256	232	785	751
Firm services | Operating Segments | CO2
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1	0	1	1
Firm services | Operating Segments | Kinder Morgan Canada
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		0		0
Firm services | Corporate and eliminations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(1)	0	(3)	(2)
Fee-based services
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	593	641	1,756	1,883
Fee-based services | Operating Segments | Natural Gas Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	182	174	561	500
Fee-based services | Operating Segments | Products Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	265	246	752	706
Fee-based services | Operating Segments | Terminals
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	132	163	398	460
Fee-based services | Operating Segments | CO2
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	14	17	45	50
Fee-based services | Operating Segments | Kinder Morgan Canada
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		41		167
Fee-based services | Corporate and eliminations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Total services revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,820	1,787	5,493	5,409
Total services revenues | Operating Segments | Natural Gas Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,064	993	3,262	2,990
Total services revenues | Operating Segments | Products Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	354	341	1,005	992
Total services revenues | Operating Segments | Terminals
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	388	395	1,183	1,211
Total services revenues | Operating Segments | CO2
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	15	17	46	51
Total services revenues | Operating Segments | Kinder Morgan Canada
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		41		167
Total services revenues | Corporate and eliminations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(1)	0	(3)	(2)
Natural gas sales
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	617	803	1,973	2,365
Total revenues	629	799	2,012	2,353
Natural gas sales | Operating Segments | Natural Gas Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	618	806	1,979	2,370
Natural gas sales | Operating Segments | Products Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Natural gas sales | Operating Segments | Terminals
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Natural gas sales | Operating Segments | CO2
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	1	1
Natural gas sales | Operating Segments | Kinder Morgan Canada
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		0		0
Natural gas sales | Corporate and eliminations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(1)	(3)	(7)	(6)
Product sales
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	516	763	1,630	2,150
Product sales | Operating Segments | Natural Gas Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	162	358	599	904
Product sales | Operating Segments | Products Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	84	94	211	310
Product sales | Operating Segments | Terminals
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	9	9	16	16
Product sales | Operating Segments | CO2
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	268	313	827	948
Product sales | Operating Segments | Kinder Morgan Canada
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		0		0
Product sales | Corporate and eliminations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(7)	(11)	(23)	(28)
Total sales revenue
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,133	1,566	3,603	4,515
Total sales revenue | Operating Segments | Natural Gas Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	780	1,164	2,578	3,274
Total sales revenue | Operating Segments | Products Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	84	94	211	310
Total sales revenue | Operating Segments | Terminals
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	9	9	16	16
Total sales revenue | Operating Segments | CO2
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	268	313	828	949
Total sales revenue | Operating Segments | Kinder Morgan Canada
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		0		0
Total sales revenue | Corporate and eliminations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ (8)	$ (14)	$ (30)	$ (34)