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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 | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
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, Amount Not Offset Against Collateral | $ 1 |
Derivative Liability, Fair Value, Net | (60) | (91)
Electricity [Member] | Gross amounts offset [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 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, Amount Not Offset Against Collateral | 1 |
Derivative Liability, Fair Value, Net | (60) | (91)
Electricity [Member] | Derivative [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | (1) |
Derivative Liability, Fair Value, Net | (60) | (91)
Electricity [Member] | Securities Pledged as Collateral [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 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, Amount Not Offset Against Collateral | 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, Amount Not Offset Against Collateral | 1 |
Derivative Liability, Fair Value, Net | (1) | (1)
Natural Gas [Member] | Gross amounts offset [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 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, Amount Not Offset Against Collateral | 1 |
Derivative Liability, Fair Value, Net | (1) | (1)
Natural Gas [Member] | Derivative [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | (1) |
Derivative Liability, Fair Value, Net | (1) | (1)
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, Amount Not Offset Against Collateral | 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, Amount Not Offset Against Collateral | 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, Amount Not Offset Against Collateral | 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, Amount Not Offset Against Collateral | 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, Amount Not Offset Against Collateral | 2 |
Assets, Total [Member] | Derivative [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | (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, Amount Not Offset Against Collateral | 0 |
Assets, Total [Member] | Commodity Contract [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 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 | (61) | (92)
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 | (61) | (92)
Liabilities, Total [Member] | Derivative [Member] |  |
Price Risk Management assets and liabilities subject to master netting agreements [Line Items] |  |
Derivative Liability, Fair Value, Net | (61) | (92)
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 financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313 + Details
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