CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) Statement - USD ($) $ in Millions	Total	Common stock	Preferred stock	Additional paid-in capital	Retained deficit	Accumulated other comprehensive loss	Stockholders’ equity attributable to KMI	Non-controlling interests
Total Kinder Morgan, Inc.’s stockholders’ equity		$ 22	$ 0	$ 41,739	$ (6,669)	$ (661)	$ 34,431
Noncontrolling interests								$ 371
Total at Dec. 31, 2016	$ 34,802
Balance (in shares) Common stock at Dec. 31, 2016	2,230,000,000
Balance (in shares) Preferred stock at Dec. 31, 2016	2,000,000
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	1,000,000
Restricted shares	$ 46			46			46
Net Income (Loss) Attributable to Parent	1,189				1,189		1,189
Net Income Attributable to Noncontrolling Interests	(26)							26
Net income (Loss), Including Portion Attributable to Noncontrolling Interestss	1,215
KML IPO	1,049			314		51	365	684
KML preferred share issuance	230						0	230
Distributions	(27)						0	(27)
Contributions	13						0	13
Preferred stock dividends	(117)				(117)		(117)
Common stock dividends	(840)				(840)		(840)
Impact of adoption of ASUs	8				8		8
Sale and deconsolidation of interest in Deeprock Development, LLC	(30)						0	(30)
Other	(15)			2			2	(17)
Other comprehensive income	$ 190					141	141	49
Balance (in shares) Common stock at Sep. 30, 2017	2,231,000,000
Balance (in shares) Preferred stock at Sep. 30, 2017	2,000,000
Total at Sep. 30, 2017	$ 36,524
Total Kinder Morgan, Inc.’s stockholders’ equity		22	0	42,092	(6,482)	(483)	35,149
Noncontrolling interests								1,065
Total at Jun. 30, 2017	$ 36,214
Balance (in shares) Common stock at Jun. 30, 2017	2,230,000,000
Balance (in shares) Preferred stock at Jun. 30, 2017	2,000,000
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	1,000,000
Restricted shares	$ 9			9			9
Net Income (Loss) Attributable to Parent	373				373		373
Net Income Attributable to Noncontrolling Interests	(14)							14
Net income (Loss), Including Portion Attributable to Noncontrolling Interestss	387
Noncontrolling Interest, Decrease, from Sale of Parent Equity Interest	(1)			(2)			(2)
KML IPO						0		1
KML preferred share issuance	230						0	230
Distributions	(12)						0	(12)
Contributions	2						0	2
Preferred stock dividends	(39)				(39)		(39)
Common stock dividends	(280)				(280)		(280)
Impact of adoption of ASUs	(1)				(1)		(1)
Sale and deconsolidation of interest in Deeprock Development, LLC	(30)						0	(30)
Other	1			2			2	(1)
Other comprehensive income	$ 44					14	14	30
Balance (in shares) Common stock at Sep. 30, 2017	2,231,000,000
Balance (in shares) Preferred stock at Sep. 30, 2017	2,000,000
Total at Sep. 30, 2017	$ 36,524
Total Kinder Morgan, Inc.’s stockholders’ equity		22	0	42,101	(6,429)	(469)	35,225
Noncontrolling interests								1,299
Total at Dec. 31, 2017	$ 35,124
Balance (in shares) Common stock at Dec. 31, 2017	2,217,110,072
Balance (in shares) Preferred stock at Dec. 31, 2017	1,600,000
Impact of adoption of ASUs	$ 66				175	(109)	66
Balance (in shares) Common stock at Jan. 01, 2018	2,217,000,000
Balance (in shares) Preferred stock at Jan. 01, 2018	2,000,000
Total at Jan. 01, 2018	$ 35,190
Total Kinder Morgan, Inc.’s stockholders’ equity	33,636	$ 22	0	41,909	(7,754)	(541)	33,636
Noncontrolling interests	1,488							1,488
Total at Dec. 31, 2017	$ 35,124
Balance (in shares) Common stock at Dec. 31, 2017	2,217,110,072
Balance (in shares) Preferred stock at Dec. 31, 2017	1,600,000
Repurchases of Shares, Shares		(13,000,000)
Repurchases of Shares, Value	$ (250)			(250)			(250)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	1,000,000
Restricted shares	$ 45			45			45
Net Income (Loss) Attributable to Parent	1,115				1,115		1,115
Net Income Attributable to Noncontrolling Interests	(302)							302
Net income (Loss), Including Portion Attributable to Noncontrolling Interestss	1,417
Distributions	(69)						0	(69)
Contributions	30						0	30
Preferred stock dividends	(117)				(117)		(117)
Common stock dividends	(1,163)				(1,163)		(1,163)
Impact of adoption of ASUs	109
Other	2							2
Other comprehensive income	$ 181					155	155	26
Balance (in shares) Common stock at Sep. 30, 2018	2,205,496,735
Balance (in shares) Preferred stock at Sep. 30, 2018	1,600,000
Total at Sep. 30, 2018	$ 35,266
Total Kinder Morgan, Inc.’s stockholders’ equity		$ 22	0	41,909	(7,579)	(650)	33,702
Noncontrolling interests								1,488
Total Kinder Morgan, Inc.’s stockholders’ equity		22	0	41,696	(7,993)	(690)	33,035
Noncontrolling interests								1,459
Total at Jun. 30, 2018	$ 34,494
Balance (in shares) Common stock at Jun. 30, 2018	2,204,000,000
Balance (in shares) Preferred stock at Jun. 30, 2018	2,000,000
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	1,000,000
Restricted shares	$ 8			8			8
Net Income (Loss) Attributable to Parent	732				732		732
Net Income Attributable to Noncontrolling Interests	(273)							273
Net income (Loss), Including Portion Attributable to Noncontrolling Interestss	1,005
Distributions	(25)						0	(25)
Contributions	4						0	4
Preferred stock dividends	(39)				(39)		(39)
Common stock dividends	(444)				(444)		(444)
Other	2							2
Other comprehensive income	$ 261					195	195	66
Balance (in shares) Common stock at Sep. 30, 2018	2,205,496,735
Balance (in shares) Preferred stock at Sep. 30, 2018	1,600,000
Total at Sep. 30, 2018	$ 35,266
Total Kinder Morgan, Inc.’s stockholders’ equity	33,487	$ 22	$ 0	$ 41,704	$ (7,744)	$ (495)	$ 33,487
Noncontrolling interests	$ 1,779							$ 1,779