Carrying amount as of the balance sheet date of the liability arising from commodity contracts such as futures contracts tied to the movement of a particular commodity, which are expected to be converted into cash or otherwise disposed of after a year or beyond the normal operating cycle, if longer.

No definition available.

Other Long-Term Liabilities Other Long-Term Liabilities (Details) (USD $) In Millions, unless otherwise specified				12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Aug. 09, 2013	Sep. 30, 2014 Energy Right Program	Sep. 30, 2014 Other long-term liabilities	Sep. 30, 2013 Other long-term liabilities	Sep. 30, 2014 Accounts payable and accrued liabilities	Sep. 30, 2013 Accounts payable and accrued liabilities
Other Long-Term Liabilities
Number of days in default				180 days
Interest rate swap liabilities	$ 1,348	$ 1,199			$ 1,348	$ 1,199
Environmental agreements liability					108	190
EnergyRight financing obligation	215	222			152	149	38	37
Membership interests of VIE subject to mandatory redemption					37	38
Commodity contract derivative liabilities					17	35
Commodity swap derivative liabilities					14	36
Currency swap liabilities	15	15			15	15
Other					271	199
Total other long-term liabilities	1,962	1,861
Percentage of membership interests issued			100.00%
Membership interests of VIE subject to mandatory redemption	50	50	40
SCCG balloon payment			4
Membership interests of VIE subject to mandatory redemption, interest rate, stated percentage			7.00%
Membership interests of VIE subject to mandatory redemption, amount, current	$ 2	$ 2