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Derivative Instruments and Hedging Activities (Income Statement Impact of Derivative Instruments) (Details) (Economic Hedges, USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Economic Hedges |  |  |  |
Derivative [Line Items] |  |  |  |
Realized gains (losses) | $ (67) | $ (35) | $ (122) | $ (74)
Unrealized gains (losses) | $ 423 | $ (227) | $ 62 | $ (323)

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- Definition Realized gains and losses on hedging activities, which are recognized as purchased-power expense. Because the entity recovers these costs from rate payers, earnings are not affected, but cash flows may be temporarily affected. + References No definition available. + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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