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Balance Sheet Components Regulatory Assets and Liabilities (Details) (USD $) In Millions | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Regulatory Assets, Current [Member] |  |
Regulatory Assets [Line Items] |  |
Price risk management | $ 153 | $ 175
Pension and other postretirement plans | 0 | 0
Deferred income taxes | 0 | 0
Deferred broker settlements | 12 | 24
Renewable energy deferral | 12 | 22
Debt reacquisition costs | 0 | 0
Other | 7 | 0
Total regulatory assets | 184 | 221
Noncurrent Regulatory Assets [Member] |  |
Regulatory Assets [Line Items] |  |
Price risk management | 142 | 185
Pension and other postretirement plans | 207 | 213
Deferred income taxes | 91 | 95
Deferred broker settlements | 0 | 0
Renewable energy deferral | 0 | 0
Debt reacquisition costs | 22 | 23
Other | 19 | 28
Total regulatory assets | 481 | 544
Current Regulatory Liabilities [Member] |  |
Regulatory Assets [Line Items] |  |
Asset retirement removal costs | 0 | 0
Asset retirement obligations | 0 | 0
Power Cost Adjustment Mechanism | 0 | 0
Regulatory treatment of income taxes (SB 408) | 8 | 5
Trojan ISFSI pollution control tax credits | 9 | 18
Other | 2 | 2
Total regulatory liabilities | 19 | 25
Noncurrent Regulatory Liabilities [Member] |  |
Regulatory Assets [Line Items] |  |
Asset retirement removal costs | 612 | 588
Asset retirement obligations | 34 | 33
Power Cost Adjustment Mechanism | 12 | 0
Regulatory treatment of income taxes (SB 408) | 1 | 9
Trojan ISFSI pollution control tax credits | 5 | 4
Other | 28 | 23
Total regulatory liabilities | $ 692 | $ 657

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- Definition Regulatory treatment of income taxes (SB 408) + Details
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- Definition For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16 -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 + Details
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- Definition Net amount of other deferred costs capitalized at the end of the reporting period. Does not include deferred finance costs or deferred acquisition costs of insurance companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 9, 10 -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 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 11 -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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