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Fair Value of FInancial Instruments Schedule of Fair Value (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds | $ 15,000,000 | $ 14,000,000
Domestic government, Debt securities | 15,000,000 | 12,000,000
Corporate debt securities held in decommissioning trust assets | 8,000,000 | 11,000,000
Fair Value - Money market funds | 2,000,000 |
Corporate Credit, Debt securities | 8,000,000 | 76,000,000
Domestic Equity Securities | 4,000,000 | 9,000,000
International Equity Securities | 1,000,000 | 1,000,000
Debt securities - domestic government | 2,000,000 | 3,000,000
Electricity | 1,000,000 | 2,000,000
Natural gas | 5,000,000 | 17,000,000
Financial Instruments, Owned, at Fair Value | 53,000,000 | 69,000,000
Liabilities from price risk management activities: [Abstract] |  |
Electricity | 82,000,000 | 137,000,000
Natural gas | 118,000,000 | 251,000,000
Liabilities, Fair Value Disclosure | 200,000,000 | 388,000,000
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds | 0 | 0
Domestic government, Debt securities | 7,000,000 | 3,000,000
Corporate debt securities held in decommissioning trust assets | 0 | 0
Fair Value - Money market funds | 0 |
Corporate Credit, Debt securities | 8,000,000 | 76,000,000
Domestic Equity Securities | 2,000,000 | 7,000,000
International Equity Securities | 1,000,000 | 1,000,000
Debt securities - domestic government | 2,000,000 | 3,000,000
Electricity | 0 | 0
Natural gas | 0 | 0
Financial Instruments, Owned, at Fair Value | 12,000,000 | 14,000,000
Liabilities from price risk management activities: [Abstract] |  |
Electricity | 0 | 0
Natural gas | 0 | 0
Liabilities, Fair Value Disclosure | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds | 15,000,000 | 14,000,000
Domestic government, Debt securities | 8,000,000 | 9,000,000
Corporate debt securities held in decommissioning trust assets | 8,000,000 | 11,000,000
Fair Value - Money market funds | 2,000,000 |
Corporate Credit, Debt securities | 0 | 0
Domestic Equity Securities | 2,000,000 | 2,000,000
International Equity Securities | 0 | 0
Debt securities - domestic government | 0 | 0
Electricity | 1,000,000 | 2,000,000
Natural gas | 3,000,000 | 17,000,000
Financial Instruments, Owned, at Fair Value | 39,000,000 | 55,000,000
Liabilities from price risk management activities: [Abstract] |  |
Electricity | 72,000,000 | 108,000,000
Natural gas | 110,000,000 | 201,000,000
Liabilities, Fair Value Disclosure | 182,000,000 | 309,000,000
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds | 0 | 0
Domestic government, Debt securities | 0 | 0
Corporate debt securities held in decommissioning trust assets | 0 | 0
Fair Value - Money market funds | 0 |
Corporate Credit, Debt securities | 0 | 0
Domestic Equity Securities | 0 | 0
International Equity Securities | 0 | 0
Debt securities - domestic government | 0 | 0
Electricity | 0 | 0
Natural gas | 2,000,000 | 0
Financial Instruments, Owned, at Fair Value | 2,000,000 | 0
Liabilities from price risk management activities: [Abstract] |  |
Electricity | 10,000,000 | 29,000,000
Natural gas | 8,000,000 | 50,000,000
Liabilities, Fair Value Disclosure | 18,000,000 | 79,000,000
Non Qualified Benefit Plans [Member] |  |
Liabilities from price risk management activities: [Abstract] |  |
Insurance contracts, at cash surrender value | $ 23,000,000 | $ 23,000,000

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents the portion of a balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount that could be realized under a life insurance contract or contracts owned by the Company as of the date of the statement of financial position. Such Company-owned life insurance policies are commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Surrender Value -URI http://asc.fasb.org/extlink&oid=6507153 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 88-5 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Technical Bulletin (FTB) -Number 85-4 -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. + Details
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- Definition The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6475986&loc=d3e42546-110969 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 38, 40 -IssueDate 2006-05-01 -Chapter 4 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 80 -Subparagraph Exhibit 4-3 -IssueDate 2006-05-01 -Chapter 4 -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. + Details
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- Definition The fair value as of the balance sheet date of firm holdings in fixed income or other debt securities issued by a corporation or other issuer not elsewhere specified in the taxonomy. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6475986&loc=d3e42546-110969 + Details
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- Definition This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + 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=7578670&loc=d3e19207-110258 + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -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. + Details
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- Definition Debt (bills, notes or bonds) that are issued by the government of the United States which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -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. + Details
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