CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income tax (benefit) expense	$ 28	$ (6)	$ (18)	$ (7)	$ 18	$ (10)	$ (7)	$ 5	$ (3)	$ 6	$ 45
Net (loss) income	43	(3)	(36)	(24)	31	(15)	(13)	10	(20)	13	74
(Loss) earnings per share Basic and Diluted (in dollars per share)	$ 0.38	$ (0.03)	$ (0.36)	$ (0.24)	$ 0.32	$ (0.16)	$ (0.14)	$ 0.11	$ (0.19)	$ 0.14	$ 0.84
Number of shares used in computing (Loss) Earnings per Share, Basic and Diluted	114	107	101	99	98	96	94	93	105	95	89
KMP [Member]
Equity in (loss) earnings of Kinder Morgan Energy Partners, L.P.	$ 71	$ (9)	$ (54)	$ (31)	$ 49	$ (25)	$ (20)	$ 15	$ (23)	$ 19	$ 119