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Revolving Credit Facilities Revolving Credit Facilities (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010
Revolving Credit Facilities [Abstract] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 670,000,000 |
Credit Facilities - $370 million revolver | 370,000,000 |
Portion of $370 million credit facility scheduled to terminate in July 2012 | 10,000,000 |
Portion of $370 million credit facility scheduled to terminate in July 2013 | 360,000,000 |
Credit Facilities - $300 million revolver | 300,000,000 |
Line of Credit Facitlity, Covenant Terms, One Month Term | one |
Line of Credit Facitlity, Covenant Terms, Two Month Term | two |
Line of Credit Facitlity, Covenant Terms, Three Month Term | three |
Line of Credit Facitlity, Covenant Terms, Six Month Term | six |
Debt Instrument, Covenant Description | .65 |
Ratio of Indebtedness to Net Capital | 0.515 |
Commercial Paper, Maximum Term | 270 |
FERC Authorized Short-term Debt, effective through February 6, 2014 | 700,000,000 |
Short-term Debt | 0 |
Commercial Paper | 30,000,000 | 19,000,000
Line of Credit Facility, Amount Outstanding | 124,000,000 |
Line of Credit Facility, Remaining Borrowing Capacity | $ 516,000,000 |

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- Definition Credit Facilities - $300 million revolver + References No definition available. + Details
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- Definition Credit Facilities - $370 million revolver, with $10 million scheduled to terminate in July 2012 and $360 million scheduled to terminate in July 2013. + References No definition available. + Details
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- Definition FERC Authorized Short-term Debt, effective through February 6, 2014 + References No definition available. + Details
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- Definition Line of Credit Facitlity, Covenant Terms, One Month Term + References No definition available. + Details
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- Definition Line of Credit Facitlity, Covenant Terms, Six Month Term + References No definition available. + Details
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- Definition Line of Credit Facitlity, Covenant Terms, Three Month Term + References No definition available. + Details
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- Definition Line of Credit Facitlity, Covenant Terms, Two Month Term + References No definition available. + Details
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- Definition Portion of $370 million credit facility scheduled to terminate in July 2012 + References No definition available. + Details
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- Definition Portion of $370 million credit facility scheduled to terminate in July 2013 + References No definition available. + Details
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- Details
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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 9 -Section 03 -Paragraph 13 -Subparagraph 2 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 02 -Paragraph 19 -Subparagraph a(3) Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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