CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 472	$ 517	$ (443)	$ 1,612
Other comprehensive (loss) income, net of tax
Change in fair value of hedge derivatives (net of tax benefit (expense) of $17, $(6), $5, and $39, respectively)	(56)	20	(16)	(132)
Reclassification of change in fair value of derivatives to net income (net of tax benefit (expense) of $1, $(13), $(22), and $(11), respectively)	(5)	40	72	35
Foreign currency translation adjustments (net of tax benefit (expense) of $—, $2, $—, and $(5), respectively)	0	(7)	1	16
Benefit plan adjustments (net of tax expense of $2, $3, $7 and $8, respectively)	5	8	21	23
Total other comprehensive (loss) income	(56)	61	78	(58)
Comprehensive income (loss)	416	578	(365)	1,554
Comprehensive income attributable to noncontrolling interests	(17)	(8)	(45)	(28)
Comprehensive income (loss) attributable to Kinder Morgan, Inc.	$ 399	$ 570	$ (410)	$ 1,526