Related Party Transactions (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012		Sep. 30, 2013	Sep. 30, 2012
Affiliate Revenues and Expenses [Abstract]
Operating revenues	$ 0	$ 1		$ 1	$ 5
Operating expenses	15	17	[1]	45	71	[1]
Reimbursement of operating expenses	$ 0	$ 0		$ 0	$ 5

[1] )Includes severance costs of $1 million and $10 million for the three and nine months ended September 30, 2012, allocated to us from El Paso as a result of KMI's acquisition of El Paso.