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	$ (4)	$ (4)	$ (4)	$ 34,527	$ 23	$ 41,701	$ (7,720)	$ (330)	$ 33,674	$ 853
Balance (shares) at Dec. 31, 2018		2,262										2,262
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201712Member
Repurchases of common shares	$ (2)		(2)			(2)
Restricted shares	28		28			28
Restricted shares (shares)		3
Net (loss) income	1,612			1,580		1,580	32
Distributions	(42)					0	(42)
Contributions	3					0	3
Common stock dividends	(1,593)			(1,593)		(1,593)
Other	(1)					0	(1)
Other comprehensive income (loss)	(58)				(54)	(54)	(4)
Balance at Sep. 30, 2019	34,474	$ 23	41,727	(7,733)	(384)	33,633	841
Balance (shares) at Sep. 30, 2019		2,265
Balance at Jun. 30, 2019	34,485	$ 23	41,734	(7,670)	(448)	33,639	846
Balance (shares) at Jun. 30, 2019		2,262
Restricted shares	(7)		(7)			(7)
Restricted shares (shares)		3
Net (loss) income	517			506		506	11
Distributions	(14)					0	(14)
Contributions	2					0	2
Common stock dividends	(569)			(569)		(569)
Other	(1)					0	(1)
Other comprehensive income (loss)	61				64	64	(3)
Balance at Sep. 30, 2019	34,474	$ 23	41,727	(7,733)	(384)	33,633	841
Balance (shares) at Sep. 30, 2019		2,265
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	41		41			41
Restricted shares (shares)		3
Net (loss) income	(443)			(488)		(488)	45
Distributions	(11)					0	(11)
Contributions	8					0	8
Common stock dividends	(1,764)			(1,764)		(1,764)
Other comprehensive income (loss)	78				78	78
Balance at Sep. 30, 2020	31,945	$ 23	41,736	(9,945)	(255)	31,559	386
Balance (shares) at Sep. 30, 2020		2,264
Balance at Jun. 30, 2020	32,124	$ 23	41,731	(9,802)	(199)	31,753	371
Balance (shares) at Jun. 30, 2020		2,261
Restricted shares	5		5			5
Restricted shares (shares)		3
Net (loss) income	472			455		455	17
Distributions	(4)					0	(4)
Contributions	2					0	2
Common stock dividends	(598)			(598)		(598)
Other comprehensive income (loss)	(56)				(56)	(56)
Balance at Sep. 30, 2020	$ 31,945	$ 23	$ 41,736	$ (9,945)	$ (255)	$ 31,559	$ 386
Balance (shares) at Sep. 30, 2020		2,264