Guarantee of Securities of Subsidiaries Income Statement and Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Guarantor Obligations [Line Items]
Total Revenues	$ 13,209	$ 14,144	$ 13,705
Costs of sales	3,263	4,421	4,345
Depreciation, depletion and amortization	2,411	2,297	2,261
Other operating expense	(3)	(3)	(1)
Total Operating Costs, Expenses and Other	8,336	10,350	10,176
Operating Income	4,873	3,794	3,529
Earnings from equity investments	101	617	428
Interest, net	(1,801)	(1,917)	(1,832)
Amortization of excess cost of equity investments and other, net	75	107	97
Income Before Income Taxes	3,165	2,506	2,161
Income Tax Expense	(926)	(587)	(1,938)
Net Income	2,239	1,919	223
Net Income Attributable to Noncontrolling Interests	(49)	(310)	(40)
Net Income Attributable to Kinder Morgan, Inc.	2,190	1,609	183
Preferred Stock Dividends	0	(128)	(156)
Net Income Available to Common Stockholders	2,190	1,481	27
Total other comprehensive income	14	338	115
Comprehensive income	2,253	2,257	338
Comprehensive income attributable to noncontrolling interests	(66)	(328)	(86)
Comprehensive income attributable to KMI	2,187	1,929	252
Parent Issuer and Guarantor
Guarantor Obligations [Line Items]
Total Revenues	0	0	35
Costs of sales	0	0	0
Depreciation, depletion and amortization	20	19	16
Other operating expense	0	(39)	78
Total Operating Costs, Expenses and Other	20	(20)	94
Operating Income	(20)	20	(59)
Earnings from consolidated subsidiaries	3,690	2,760	3,575
Earnings from equity investments	0	0	0
Interest, net	(757)	(780)	(701)
Amortization of excess cost of equity investments and other, net	(15)	27	2
Income Before Income Taxes	2,898	2,027	2,817
Income Tax Expense	(708)	(418)	(2,634)
Net Income	2,190	1,609	183
Net Income Attributable to Noncontrolling Interests	0	0	0
Net Income Attributable to Kinder Morgan, Inc.	2,190	1,609	183
Preferred Stock Dividends		(128)	(156)
Net Income Available to Common Stockholders		1,481	27
Total other comprehensive income	(3)	320	69
Comprehensive income	2,187	1,929	252
Comprehensive income attributable to noncontrolling interests	0	0	0
Comprehensive income attributable to KMI	2,187	1,929	252
Subsidiary Issuer and Guarantor - KMP
Guarantor Obligations [Line Items]
Total Revenues	0	0	0
Costs of sales	0	0	0
Depreciation, depletion and amortization	0	0	0
Other operating expense	1	1	1
Total Operating Costs, Expenses and Other	1	1	1
Operating Income	(1)	(1)	(1)
Earnings from consolidated subsidiaries	3,948	2,533	2,681
Earnings from equity investments	0	0	0
Interest, net	(2)	(8)	7
Amortization of excess cost of equity investments and other, net	(2)	0	0
Income Before Income Taxes	3,943	2,524	2,687
Income Tax Expense	(3)	68	(5)
Net Income	3,940	2,592	2,682
Net Income Attributable to Noncontrolling Interests	0	0	0
Net Income Attributable to Kinder Morgan, Inc.	3,940	2,592	2,682
Preferred Stock Dividends		0	0
Net Income Available to Common Stockholders		2,592	2,682
Total other comprehensive income	28	290	194
Comprehensive income	3,968	2,882	2,876
Comprehensive income attributable to noncontrolling interests	0	0	0
Comprehensive income attributable to KMI	3,968	2,882	2,876
Subsidiary Guarantors
Guarantor Obligations [Line Items]
Total Revenues	12,016	12,767	12,202
Costs of sales	3,160	4,247	4,124
Depreciation, depletion and amortization	2,114	1,971	1,933
Other operating expense	2,248	3,693	3,014
Total Operating Costs, Expenses and Other	7,522	9,911	9,071
Operating Income	4,494	2,856	3,131
Earnings from consolidated subsidiaries	857	599	419
Earnings from equity investments	101	617	428
Interest, net	(1,019)	(1,090)	(1,104)
Amortization of excess cost of equity investments and other, net	(10)	(18)	13
Income Before Income Taxes	4,423	2,964	2,887
Income Tax Expense	(56)	(61)	237
Net Income	4,367	2,903	3,124
Net Income Attributable to Noncontrolling Interests	0	0	0
Net Income Attributable to Kinder Morgan, Inc.	4,367	2,903	3,124
Preferred Stock Dividends		0	0
Net Income Available to Common Stockholders		2,903	3,124
Total other comprehensive income	(51)	280	217
Comprehensive income	4,316	3,183	3,341
Comprehensive income attributable to noncontrolling interests	0	0	0
Comprehensive income attributable to KMI	4,316	3,183	3,341
Subsidiary Non-Guarantors
Guarantor Obligations [Line Items]
Total Revenues	1,290	1,526	1,614
Costs of sales	154	277	322
Depreciation, depletion and amortization	277	307	312
Other operating expense	459	23	522
Total Operating Costs, Expenses and Other	890	607	1,156
Operating Income	400	919	458
Earnings from consolidated subsidiaries	98	62	59
Earnings from equity investments	0	0	0
Interest, net	(23)	(39)	(34)
Amortization of excess cost of equity investments and other, net	19	3	21
Income Before Income Taxes	494	945	504
Income Tax Expense	(159)	(176)	464
Net Income	335	769	968
Net Income Attributable to Noncontrolling Interests	0	0	0
Net Income Attributable to Kinder Morgan, Inc.	335	769	968
Preferred Stock Dividends		0	0
Net Income Available to Common Stockholders		769	968
Total other comprehensive income	224	136	160
Comprehensive income	559	905	1,128
Comprehensive income attributable to noncontrolling interests	0	0	0
Comprehensive income attributable to KMI	559	905	1,128
Consolidated KMI
Guarantor Obligations [Line Items]
Total Revenues	13,209	14,144	13,705
Costs of sales	3,263	4,421	4,345
Depreciation, depletion and amortization	2,411	2,297	2,261
Other operating expense	2,662	3,632	3,570
Total Operating Costs, Expenses and Other	8,336	10,350	10,176
Operating Income	4,873	3,794	3,529
Earnings from consolidated subsidiaries	0	0	0
Earnings from equity investments	101	617	428
Interest, net	(1,801)	(1,917)	(1,832)
Amortization of excess cost of equity investments and other, net	(8)	12	36
Income Before Income Taxes	3,165	2,506	2,161
Income Tax Expense	(926)	(587)	(1,938)
Net Income	2,239	1,919	223
Net Income Attributable to Noncontrolling Interests	(49)	(310)	(40)
Net Income Attributable to Kinder Morgan, Inc.	2,190	1,609	183
Preferred Stock Dividends		(128)	(156)
Net Income Available to Common Stockholders		1,481	27
Total other comprehensive income	14	338	115
Comprehensive income	2,253	2,257	338
Comprehensive income attributable to noncontrolling interests	(66)	(328)	(86)
Comprehensive income attributable to KMI	2,187	1,929	252
Consolidating Adjustments
Guarantor Obligations [Line Items]
Total Revenues	(97)	(149)	(146)
Costs of sales	(51)	(103)	(101)
Depreciation, depletion and amortization	0	0	0
Other operating expense	(46)	(46)	(45)
Total Operating Costs, Expenses and Other	(97)	(149)	(146)
Operating Income	0	0	0
Earnings from consolidated subsidiaries	(8,593)	(5,954)	(6,734)
Earnings from equity investments	0	0	0
Interest, net	0	0	0
Amortization of excess cost of equity investments and other, net	0	0	0
Income Before Income Taxes	(8,593)	(5,954)	(6,734)
Income Tax Expense	0	0	0
Net Income	(8,593)	(5,954)	(6,734)
Net Income Attributable to Noncontrolling Interests	(49)	(310)	(40)
Net Income Attributable to Kinder Morgan, Inc.	(8,642)	(6,264)	(6,774)
Preferred Stock Dividends		0	0
Net Income Available to Common Stockholders		(6,264)	(6,774)
Total other comprehensive income	(184)	(688)	(525)
Comprehensive income	(8,777)	(6,642)	(7,259)
Comprehensive income attributable to noncontrolling interests	(66)	(328)	(86)
Comprehensive income attributable to KMI	$ (8,843)	$ (6,970)	$ (7,345)