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Price Risk Management Net realized and unrealized gains and losses on derivative transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Commodity contracts:
Electricity	$ 29	$ (38)	$ 70	$ (29)
Natural Gas	$ 0	$ (6)	$ 44	$ (42)

X

- Definition

Commodity contracts: [Abstract]

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No definition available.

+ Details

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- Definition

Realized and unrealized gains and losses, net on commodity contracts related to electricity not designated as hedging instruments included in purchased power and fuel expense in the statement of income.

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No definition available.

+ Details

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- Definition

Realized and unrealized gains and losses, net on commodity contracts related to natural gas not designated as hedging instruments included in purchased power and fuel expense in the statement of income.

+ References

No definition available.

+ Details

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