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Regulatory Assets and Liabilities Schedule of Regulatory Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Regulatory Assets [Line Items] |  |
Remaining Recovery Period of Regulatory Assets, Price Risk Management | 2 years |
Remaining Recovery Period of Regulatory Asset, Deferred Broker Settlements | 1 year |
Remaining Recovery Period of Regulatory Asset, Debt Reacquisition Costs | 7 years |
Price risk management | $ 4 | $ 19
Deferred income taxes | 20 | 22
Remaining refund period of power cost adjustment mechanism | 1 year |
Asset retirement obligations | 94 | 87
Current Regulatory Liabilities [Member] |  |
Regulatory Assets [Line Items] |  |
Asset retirement removal costs | 0 | 0
Asset retirement obligations | 0 | 0
Power Cost Adjustment Mechanism | 6 | 0
Other | 6 | 6
Total regulatory liabilities | 12 | 6
Noncurrent Regulatory Liabilities [Member] |  |
Regulatory Assets [Line Items] |  |
Asset retirement removal costs | 692 | 637
Asset retirement obligations | 39 | 36
Power Cost Adjustment Mechanism | 0 | 10
Other | 34 | 37
Total regulatory liabilities | 765 | 720
Regulatory Assets, Current [Member] |  |
Regulatory Assets [Line Items] |  |
Price risk management | 123 | 194
Pension and other postretirement plans | 0 | 0
Deferred income taxes | 0 | 0
Deferred broker settlements | 20 | 11
Debt reacquisition costs | 0 | 0
Deferred capital project | 0 | 0
Other | 1 | 11
Total regulatory assets | 144 | 216
Noncurrent Regulatory Assets [Member] |  |
Regulatory Assets [Line Items] |  |
Price risk management | 71 | 172
Pension and other postretirement plans | 321 | 295
Deferred income taxes | 80 | 87
Deferred broker settlements | 1 | 0
Debt reacquisition costs | 22 | 28
Deferred capital project | 16 | 0
Other | 13 | 12
Total regulatory assets | $ 524 | $ 594

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- Definition Deferred broker settlements. + References No definition available. + Details
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- Definition Regulatory deferral related to the Power Cost Adjustment Mechanism + References No definition available. + Details
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- Definition Regulatory assets from price risk management activities + References No definition available. + Details
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- Definition Other regulatory liabilities. + References No definition available. + Details
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- Definition Remaining Recovery Period of Regulatory Asset, Debt Reacquisition Costs, For Which No Return on Investment During Recovery Period is Provided + References No definition available. + Details
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- Definition Remaining Recovery Period of Regulatory Asset, Deferred Broker Settlements, For Which No Return on Investment During Recovery Period is Provided + References No definition available. + Details
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- Definition Remaining recovery period of regulatory assets, Price Risk Management, for which no return on investment during recovery period is provided. + References No definition available. + Details
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- Definition Remaining refund period of regulatory liabilities, Power Cost Adjustment Mechanism. + References No definition available. + Details
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- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 3, 10, 22 -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 FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences derived regulatory assets and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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