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Price Risk Management Price Risk Management assets and liabilities subject to master netting agreements (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Electricity [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | $ 1 |
Derivative Liability, Fair Value, Net | 12 | 20
Electricity [Member] | Gross amounts offset [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | 0 |
Derivative Liability, Fair Value, Net | 0 | 0
Electricity [Member] | net amount presented [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | 1 |
Derivative Liability, Fair Value, Net | 12 | 20
Electricity [Member] | Derivative [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | (1) |
Derivative Liability, Fair Value, Net | (12) | (20)
Electricity [Member] | Securities Pledged as Collateral [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | 0 |
Derivative Liability, Fair Value, Net | 0 | 0
Electricity [Member] | Commodity Contract [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | 0 |
Derivative Liability, Fair Value, Net | 0 | 0
Natural Gas [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | 1 |
Derivative Liability, Fair Value, Net | 5 | 7
Natural Gas [Member] | Gross amounts offset [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | 0 |
Derivative Liability, Fair Value, Net | 0 | 0
Natural Gas [Member] | net amount presented [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | 1 |
Derivative Liability, Fair Value, Net | 5 | 7
Natural Gas [Member] | Derivative [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | (1) |
Derivative Liability, Fair Value, Net | (5) | (7)
Natural Gas [Member] | Securities Pledged as Collateral [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | 0 |
Derivative Liability, Fair Value, Net | 0 | 0
Natural Gas [Member] | Commodity Contract [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | 0 |
Derivative Liability, Fair Value, Net | 0 | 0
Assets, Total [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | 2 |
Assets, Total [Member] | Gross amounts offset [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | 0 |
Assets, Total [Member] | net amount presented [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | 2 |
Assets, Total [Member] | Derivative [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | (2) |
Assets, Total [Member] | Securities Pledged as Collateral [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | 0 |
Assets, Total [Member] | Commodity Contract [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Net | 0 |
Liabilities, Total [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Liability, Fair Value, Net | 17 | 27
Liabilities, Total [Member] | Gross amounts offset [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Liability, Fair Value, Net | 0 | 0
Liabilities, Total [Member] | net amount presented [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Liability, Fair Value, Net | 17 | 27
Liabilities, Total [Member] | Derivative [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Liability, Fair Value, Net | (17) | (27)
Liabilities, Total [Member] | Securities Pledged as Collateral [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Liability, Fair Value, Net | 0 | 0
Liabilities, Total [Member] | Commodity Contract [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Liability, Fair Value, Net | $ 0 | $ 0

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- Definition Fair value of the gross assets less the gross liabilities of a derivative asset or group of derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 + Details
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