Risk Management Activities and Derivative Transactions Derivatives Under Financial Trading Program (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | |||
---|---|---|---|---|---|
Jun. 30, 2014
|
Jun. 30, 2013
|
Jun. 30, 2014
|
Jun. 30, 2013
|
Sep. 30, 2013
|
|
Natural Gas Futures
|
|||||
Derivative | |||||
Notional amount | 0 | 0 | 0 | ||
Fair value | $ 0 | $ 0 | $ 0 | ||
Fuel Oil and Crude Oil Futures
|
|||||
Derivative | |||||
Notional amount | 0 | 0 | 0 | ||
Fair value | 0 | 0 | 0 | ||
Natural Gas Swap
|
|||||
Derivative | |||||
Notional amount | 117,575,000 | 117,575,000 | 152,922,500 | ||
Fair value | (91) | (91) | (169) | ||
Fuel Oil and Crude Oil Swap
|
|||||
Derivative | |||||
Notional amount | 0 | 0 | 1,205,000 | ||
Fair value | 1 | 1 | 3 | ||
Natural Gas Option
|
|||||
Derivative | |||||
Notional amount | 0 | 0 | 0 | ||
Fair value | 0 | 0 | 0 | ||
Fuel Oil and Crude Oil Option
|
|||||
Derivative | |||||
Notional amount | 0 | 0 | 0 | ||
Fair value | 0 | 0 | 0 | ||
Natural Gas Total Contracts
|
|||||
Derivative | |||||
Notional amount | 117,575,000 | 117,575,000 | 152,922,500 | ||
Fair value | (91) | (91) | (169) | ||
Decrease (increase) in fuel expense | (5) | (13) | (23) | (60) | |
Decrease (increase) in purchased power expense | (1) | (8) | (9) | (40) | |
Fuel Oil and Crude Oil Total Contracts
|
|||||
Derivative | |||||
Notional amount | 0 | 0 | 1,205,000 | ||
Fair value | 1 | 1 | 3 | ||
Decrease (increase) in fuel expense | 0 | 0 | 2 | 2 | |
Coal Contract Total Contracts
|
|||||
Derivative | |||||
Fair value | 0 | 0 | 0 | ||
Decrease (increase) in fuel expense | 0 | 0 | 0 | (1) | |
Closed derivative contracts
|
|||||
Derivative | |||||
Fair value | $ (3) | $ (3) | $ (8) |