CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive loss	Stockholders’ equity attributable to KMI	Non-controlling interests	Impact of adoption of ASU 2017-12	Impact of adoption of ASU 2017-12 Accumulated deficit	Impact of adoption of ASU 2017-12 Stockholders’ equity attributable to KMI	Adjusted balance	Adjusted balance Common stock	Adjusted balance Additional paid-in capital	Adjusted balance Accumulated deficit	Adjusted balance Accumulated other comprehensive loss	Adjusted balance Stockholders’ equity attributable to KMI	Adjusted balance Non-controlling interests
Balance at Dec. 31, 2018	$ 34,531	$ 23	$ 41,701	$ (7,716)	$ (330)	$ 33,678	$ 853	$ (5)	$ (5)	$ (5)	$ 34,526	$ 23	$ 41,701	$ (7,721)	$ (330)	$ 33,673	$ 853
Balance (shares) at Dec. 31, 2018		2,262										2,262
Repurchases of common shares	(2)		(2)			(2)
Restricted shares	35		35			35
Net (loss) income	1,095			1,074		1,074	21
Distributions	(28)					0	(28)
Contributions	1					0	1
Common stock dividends	(1,024)			(1,024)		(1,024)
Other comprehensive income (loss)	(119)				(118)	(118)	(1)
Balance at Jun. 30, 2019	$ 34,484	$ 23	41,734	(7,671)	(448)	33,638	846
Balance (shares) at Jun. 30, 2019		2,262
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201712Member
Balance at Mar. 31, 2019	$ 34,455	$ 23	41,716	(7,620)	(508)	33,611	844
Balance (shares) at Mar. 31, 2019		2,262
Restricted shares	18		18			18
Net (loss) income	528			518		518	10
Distributions	(14)					0	(14)
Contributions	1					0	1
Common stock dividends	(569)			(569)		(569)
Other comprehensive income (loss)	65				60	60	5
Balance at Jun. 30, 2019	34,484	$ 23	41,734	(7,671)	(448)	33,638	846
Balance (shares) at Jun. 30, 2019		2,262
Balance at Dec. 31, 2019	34,086	$ 23	41,745	(7,693)	(333)	33,742	344
Balance (shares) at Dec. 31, 2019		2,265
Repurchases of common shares	(50)		(50)			(50)
Repurchases of common shares (shares)		(4)
Restricted shares	36		36			36
Net (loss) income	(915)			(943)		(943)	28
Distributions	(7)					0	(7)
Contributions	6					0	6
Common stock dividends	(1,166)			(1,166)		(1,166)
Other comprehensive income (loss)	134				134	134
Balance at Jun. 30, 2020	32,124	$ 23	41,731	(9,802)	(199)	31,753	371
Balance (shares) at Jun. 30, 2020		2,261
Balance at Mar. 31, 2020	33,464	$ 23	41,713	(8,568)	(62)	33,106	358
Balance (shares) at Mar. 31, 2020		2,261
Restricted shares	18		18			18
Net (loss) income	(624)			(637)		(637)	13
Distributions	(4)					0	(4)
Contributions	4					0	4
Common stock dividends	(597)			(597)		(597)
Other comprehensive income (loss)	(137)				(137)	(137)
Balance at Jun. 30, 2020	$ 32,124	$ 23	$ 41,731	$ (9,802)	$ (199)	$ 31,753	$ 371
Balance (shares) at Jun. 30, 2020		2,261