Subsequent Events (Details) (Subsequent Event [Member], Tennessee Regulatory Authority [Member], Integrity Management Rider [Member], USD $)	0 Months Ended	6 Months Ended
	May 13, 2014	Apr. 30, 2014
Subsequent Event [Member] | Tennessee Regulatory Authority [Member] | Integrity Management Rider [Member]
Public Utilities Rate Matters Approved [Abstract]
Public Utilities Approved Rate Increase (Decrease) Amount	$ 13,100,000
Public Utilities Disclosure Of Rate Matters		In August 2013, we filed a petition with the Tennessee Regulatory Authority (TRA) seeking authority to implement an integrity management rider (IMR) to recover the costs of our capital investments that are made in compliance with federal and state safety and integrity management laws or regulations. We proposed that the rider be effective October 1, 2013 with an initial adjustment on January 1, 2014 of $13.1 million in annual margin revenue from tariff customers based on capital expenditures incurred through October 2013 and for rates to be updated annually outside of general rate cases for the return of and on these capital investments. In September 2013, the TRA issued an order suspending this proposed tariff through December 30, 2013. On November 27, 2013, we and the Tennessee Attorney General’s Consumer Advocate Division filed an IMR settlement with the TRA. A hearing on this matter was held December 18, 2013, and the TRA approved the IMR settlement as filed. A written order was issued May 13, 2014.