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Derivative Financial Instruments (Other Derivatives) (Details) (Not Designated As Hedging Instrument [Member], Natural Gas (Generation) [Member], Operating Expenses-Fuel [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Not Designated As Hedging Instrument [Member] \| Natural Gas (Generation) [Member] \| Operating Expenses-Fuel [Member]
Derivative [Line Items]
Gain (Loss) Recognized in Income		$ (1)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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