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Regulatory Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Regulatory Assets |  |
Regulatory Assets, Current | $ 586 | $ 494
Regulatory Asset, Long-term | 5,776 | 5,815
Total Regulatory Assets | 6,362 | 6,309
Regulatory Liabilities |  |
Regulatory Liabilities, Current | 721 | 670
Regulatory Liabilities, Long-term | 5,038 | 4,670
Total Regulatory Liabilities | 5,759 | 5,340
Regulatory Balancing Accounts, Assets |  |
Regulatory Assets |  |
Regulatory Assets, Current | 351 | 223
Regulatory Asset, Long-term | 92 | 69
Energy Derivatives |  |
Regulatory Assets |  |
Regulatory Assets, Current | 227 | 264
Regulatory Asset, Long-term | 809 | 836
Other |  |
Regulatory Assets |  |
Regulatory Assets, Current | 8 | 7
Regulatory Asset, Long-term | 236 | 298
Regulatory Liabilities |  |
Regulatory Liabilities, Current | 9 | 9
Regulatory Liabilities, Long-term | 7 | 4
Deferred Income Taxes - Net |  |
Regulatory Assets |  |
Regulatory Asset, Long-term | 2,097 | 2,020
Pensions and Other Postretirement Benefits |  |
Regulatory Assets |  |
Regulatory Asset, Long-term | 1,672 | 1,703
Unamortized Investments - Net |  |
Regulatory Assets |  |
Regulatory Asset, Long-term | 483 | 484
Unamortized Loss on Reacquired Debt |  |
Regulatory Assets |  |
Regulatory Asset, Long-term | 238 | 249
Nuclear-Related Investment - Net |  |
Regulatory Assets |  |
Regulatory Asset, Long-term | 149 | 156
Regulatory Balancing Accounts, Liabilities |  |
Regulatory Liabilities |  |
Regulatory Liabilities, Current | 712 | 661
Regulatory Liabilities, Long-term | 1,054 | 864
Costs of Removal |  |
Regulatory Liabilities |  |
Regulatory Liabilities, Long-term | 2,742 | 2,697
Asset Retirement Obligations |  |
Regulatory Liabilities |  |
Regulatory Liabilities, Long-term | $ 1,235 | $ 1,105

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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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 9, 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + 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 Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + 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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- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current 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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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + 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 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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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