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Regulatory Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |  |
Regulatory Assets Earning a Return, Other Category |  | $ 16 | $ 15 |
Regulatory Assets Earning a Return |  | 59 |  |
Regulatory Assets Earning a Rate of Return at the Cost of Debt |  | 34 |  |
Authorized Cost of Debt |  | 6.065% |  |
Regulatory Assets Earning a Rate of Return at the Cost of Capital |  | 1 |  |
Authorized Cost of Capital |  | 8.033% |  |
Regulatory Assets Earning a Rate of Return by Inclusion in Rate Base |  | 15 |  |
Regulatory Assets Earning a Rate of Return at the Approved Rate |  | 9 |  |
Approved Rate for Deferred Account Under Amortization, Low End of Range |  | 1.38% |  |
Approved Rate for Deferred Accounts under Amortization, High End of Range |  | 2.24% |  |
Proceeds from Legal Settlements | $ 44 | $ 44 | $ 0 | $ 0

X
- Definition High end of the range of approved rates of return for amortizing deferred accounts (regulatory assets). + References No definition available. + Details
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- Definition Low end of the range of approved rates of return for amortizing deferred accounts (regulatory assets). + References No definition available. + Details
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- Definition Regulatory Assets Earning a Rate of Return at the Cost of Debt + References No definition available. + Details
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- Definition Regulatory assets earning a rate of return at the approved rate. + References No definition available. + Details
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- Definition Regulatory assets earning a rate of return at the cost of capital. + References No definition available. + Details
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- Definition Regulatory assets earning a rate of return by inclusion in rate base. + References No definition available. + Details
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- Definition Regulatory assets earning a rate of return. + References No definition available. + Details
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- Definition Regulatory assets in 'other' category earning a rate of return. + References No definition available. + Details
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- Definition Cash received for the settlement of litigation during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Details
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