Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	$ 2,971	$ 3,317	$ 6,143	$ 6,571
Other revenues	243	111	500	275
Total revenues	3,214	3,428	6,643	6,846
Natural Gas Pipelines
Disaggregation of Revenue [Line Items]
Total revenues	1,956	2,095	4,148	4,211
Products Pipelines
Disaggregation of Revenue [Line Items]
Total revenues	442	503	866	945
Terminals
Disaggregation of Revenue [Line Items]
Total revenues	506	514	1,014	1,009
CO2
Disaggregation of Revenue [Line Items]
Total revenues	310	250	615	554
Kinder Morgan Canada(a)
Disaggregation of Revenue [Line Items]
Total revenues	0	65	0	126
Operating Segments | Natural Gas Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	1,880	2,051	3,996	4,107
Other revenues	88	56	173	126
Total revenues	1,968	2,107	4,169	4,233
Operating Segments | Products Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	397	462	778	867
Other revenues	45	41	88	78
Total revenues	442	503	866	945
Operating Segments | Terminals
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	402	420	802	823
Other revenues	105	95	214	187
Total revenues	507	515	1,016	1,010
Operating Segments | CO2
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	306	335	591	670
Other revenues	4	(85)	24	(116)
Total revenues	310	250	615	554
Operating Segments | Kinder Morgan Canada(a)
Disaggregation of Revenue [Line Items]
Revenues from contract with customers		62		126
Other revenues		3		0
Total revenues		65		126
Corporate and eliminations
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	(14)	(13)	(24)	(22)
Other revenues	1	1	1	0
Total revenues	(13)	(12)	(23)	(22)
Firm services
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	1,251	1,187	2,510	2,380
Firm services | Operating Segments | Natural Gas Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	889	826	1,819	1,671
Firm services | Operating Segments | Products Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	84	99	164	191
Firm services | Operating Segments | Terminals
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	279	263	529	519
Firm services | Operating Segments | CO2
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	0	0	0	1
Firm services | Operating Segments | Kinder Morgan Canada(a)
Disaggregation of Revenue [Line Items]
Revenues from contract with customers		0		0
Firm services | Corporate and eliminations
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	(1)	(1)	(2)	(2)
Fee-based services
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	573	631	1,163	1,242
Fee-based services | Operating Segments | Natural Gas Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	187	162	379	326
Fee-based services | Operating Segments | Products Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	252	239	487	460
Fee-based services | Operating Segments | Terminals
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	118	153	266	297
Fee-based services | Operating Segments | CO2
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	15	16	31	33
Fee-based services | Operating Segments | Kinder Morgan Canada(a)
Disaggregation of Revenue [Line Items]
Revenues from contract with customers		62		126
Fee-based services | Corporate and eliminations
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	1	(1)	0	0
Total services revenues
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	1,824	1,818	3,673	3,622
Total services revenues | Operating Segments | Natural Gas Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	1,076	988	2,198	1,997
Total services revenues | Operating Segments | Products Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	336	338	651	651
Total services revenues | Operating Segments | Terminals
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	397	416	795	816
Total services revenues | Operating Segments | CO2
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	15	16	31	34
Total services revenues | Operating Segments | Kinder Morgan Canada(a)
Disaggregation of Revenue [Line Items]
Revenues from contract with customers		62		126
Total services revenues | Corporate and eliminations
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	0	(2)	(2)	(2)
Natural gas sales
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	603	736	1,356	1,562
Total revenues	609	727	1,383	1,554
Natural gas sales | Operating Segments | Natural Gas Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	607	736	1,361	1,564
Natural gas sales | Operating Segments | Products Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	0	0	0	0
Natural gas sales | Operating Segments | Terminals
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	0	0	0	0
Natural gas sales | Operating Segments | CO2
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	0	1	1	1
Natural gas sales | Operating Segments | Kinder Morgan Canada(a)
Disaggregation of Revenue [Line Items]
Revenues from contract with customers		0		0
Natural gas sales | Corporate and eliminations
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	(4)	(1)	(6)	(3)
Product sales
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	544	763	1,114	1,387
Product sales | Operating Segments | Natural Gas Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	197	327	437	546
Product sales | Operating Segments | Products Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	61	124	127	216
Product sales | Operating Segments | Terminals
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	5	4	7	7
Product sales | Operating Segments | CO2
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	291	318	559	635
Product sales | Operating Segments | Kinder Morgan Canada(a)
Disaggregation of Revenue [Line Items]
Revenues from contract with customers		0		0
Product sales | Corporate and eliminations
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	(10)	(10)	(16)	(17)
Total sales revenue
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	1,147	1,499	2,470	2,949
Total sales revenue | Operating Segments | Natural Gas Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	804	1,063	1,798	2,110
Total sales revenue | Operating Segments | Products Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	61	124	127	216
Total sales revenue | Operating Segments | Terminals
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	5	4	7	7
Total sales revenue | Operating Segments | CO2
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	291	319	560	636
Total sales revenue | Operating Segments | Kinder Morgan Canada(a)
Disaggregation of Revenue [Line Items]
Revenues from contract with customers		0		0
Total sales revenue | Corporate and eliminations
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	$ (14)	$ (11)	$ (22)	$ (20)