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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 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Electricity [Member] | Reported Value Measurement [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | $ (91) | $ (20)
Electricity [Member] | Gross amounts offset [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Electricity [Member] | net amount presented [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (91) | (20)
Electricity [Member] | Derivative [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (91) | (20)
Electricity [Member] | Securities Pledged as Collateral [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Electricity [Member] | Commodity Contract [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Natural Gas [Member] | Reported Value Measurement [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (1) | (7)
Natural Gas [Member] | Gross amounts offset [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Natural Gas [Member] | net amount presented [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (1) | (7)
Natural Gas [Member] | Derivative [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (1) | (7)
Natural Gas [Member] | Securities Pledged as Collateral [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Natural Gas [Member] | Commodity Contract [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Liabilities, Total [Member] | Reported Value Measurement [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (92) | (27)
Liabilities, Total [Member] | Gross amounts offset [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Liabilities, Total [Member] | net amount presented [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (92) | (27)
Liabilities, Total [Member] | Derivative [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (92) | (27)
Liabilities, Total [Member] | Securities Pledged as Collateral [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Liabilities, Total [Member] | Commodity Contract [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | $ 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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