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Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
CRRs | Market Simulation Model |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | $ 366,000,000 | $ 186,000,000
Fair Value, Liabilities | 0 | 0
Tolling | Option Model |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | 5,000,000 | 4,000,000
Fair Value, Liabilities | 1,175,000,000 | 1,005,000,000
Level 3 | CRRs | Market Simulation Model | Gas Prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected prices (in dollars per unit) | 3.50 | 2.95
Level 3 | CRRs | Market Simulation Model | Gas Prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected prices (in dollars per unit) | 7.10 | 7.78
Level 3 | CRRs | Market Simulation Model | Load Forecast | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, power units (in megawatts) | 7,603 | 7,597
Level 3 | CRRs | Market Simulation Model | Load Forecast | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, power units (in megawatts) | 24,896 | 26,612
Level 3 | CRRs | Market Simulation Model | Congestion Prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected prices (in dollars per unit) | (9.86) | (13.90)
Level 3 | CRRs | Market Simulation Model | Congestion Prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected prices (in dollars per unit) | 108.56 | 226.75
Level 3 | Tolling | Option Model | Gas Prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate (as a percent) | 16.00% | 17.00%
Level 3 | Tolling | Option Model | Gas Prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate (as a percent) | 35.00% | 36.00%
Level 3 | Tolling | Option Model | Gas Prices | Weighted Average |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate (as a percent) | 21.00% | 22.00%
Level 3 | Tolling | Option Model | Power Prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate (as a percent) | 25.00% | 26.00%
Expected prices (in dollars per unit) | 38.00 | 35.00
Level 3 | Tolling | Option Model | Power Prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate (as a percent) | 45.00% | 64.00%
Expected prices (in dollars per unit) | 63.90 | 84.10
Level 3 | Tolling | Option Model | Power Prices | Weighted Average |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate (as a percent) | 30.00% | 29.00%
Expected prices (in dollars per unit) | $ 47.40 | $ 55.40

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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