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Commitments And Contingencies (Third-Party Power Purchases) (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Long-term Purchase Commitment [Line Items]
Total	$ 1,900
Minimum [Member]
Long-term Purchase Commitment [Line Items]
Long-term agreements range, years	1
Maximum [Member]
Long-term Purchase Commitment [Line Items]
Long-term agreements range, years	25

Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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