Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2011
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Dec. 31, 2010
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Regulatory Assets and Liabilities Disclosure [Abstract] | ||
Regulatory Assets Earning a Return, Other Category | $ 21 | $ 26 |
Regulatory Assets Earning a Return | 22 | |
Regulatory Assets Earning a Rate of Return at the Cost of Capital | 7 | |
Authorized Cost of Capital | 8.033% | |
Regulatory Assets Earning a Rate of Return at the Approved Rate | 7 | |
Approved Rate for Deferred Account Under Amortization, Low End of Range | 2.01% | |
Approved Rate for Deferred Accounts under Amortization, High End of Range | 4.27% | |
Regulatory Assets Earning a Rate of Return by Inclusion in Rate Base | 8 | |
Amount of Impairment to Carrying Amount of Regulatory Assets | $ 3 |
X | ||||||||||
- Definition
High end of the range of approved rates of return for amortizing deferred accounts (regulatory assets). No definition available.
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X | ||||||||||
- Definition
Low end of the range of approved rates of return for amortizing deferred accounts (regulatory assets). No definition available.
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X | ||||||||||
- Definition
Authorized cost of capital rate. No definition available.
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X | ||||||||||
- Definition
Regulatory assets earning a rate of return at the approved rate. No definition available.
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X | ||||||||||
- Definition
Regulatory assets earning a rate of return at the cost of capital. No definition available.
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X | ||||||||||
- Definition
Regulatory assets earning a rate of return by inclusion in rate base. No definition available.
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X | ||||||||||
- Definition
Regulatory assets earning a rate of return. No definition available.
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X | ||||||||||
- Definition
Regulatory assets in 'other' category earning a rate of return. No definition available.
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X | ||||||||||
- Definition
Discloses the amount of any reduction to the carrying amounts of regulated assets that result from impairment (for example, rate actions of a regulator). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Details
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