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Regulatory Assets and Liabilities (Tables) | 3 Months Ended
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Mar. 31, 2013
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory Assets Included on the Consolidated Balance Sheets | Regulatory assets included on the consolidated balance sheets are:
(in millions) | March 31, 2013 |  | December 31, 2012
Current: |  |  |
Regulatory balancing accounts | $ | 624 |  |  | $ | 502 |
Energy derivatives | 48 |  |  | 70 |
Total Current | 672 |  |  | 572 |
Long-term: |  |  |
Deferred income taxes, net | 2,718 |  |  | 2,663 |
Pensions and other postretirement benefits | 1,539 |  |  | 1,550 |
Energy derivatives | 974 |  |  | 900 |
Unamortized investments, net | 487 |  |  | 507 |
Unamortized loss on reacquired debt | 222 |  |  | 228 |
Nuclear-related investment, net | 138 |  |  | 141 |
Regulatory balancing accounts | 76 |  |  | 73 |
Other | 364 |  |  | 360 |
Total Long-term | 6,518 |  |  | 6,422 |
Total Regulatory Assets | $ | 7,190 |  |  | $ | 6,994 |
Regulatory Liabilities Included on the Consolidated Balance Sheets | Regulatory liabilities included on the consolidated balance sheets are:
(in millions) | March 31, 2013 |  | December 31, 2012
Current: |  |  |
Regulatory balancing accounts | $ | 383 |  |  | $ | 484 |
Other | 60 |  |  | 52 |
Total Current | 443 |  |  | 536 |
Long-term: |  |  |
Costs of removal | 2,769 |  |  | 2,731 |
Asset Retirement Obligations | 1,538 |  |  | 1,385 |
Regulatory balancing accounts | 1,156 |  |  | 1,091 |
Other | 7 |  |  | 7 |
Total Long-term | 5,470 |  |  | 5,214 |
Total Regulatory Liabilities | $ | 5,913 |  |  | $ | 5,750 |

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- Definition Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 715 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501251&loc=d3e52485-110419 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 9 -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 5: 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 Tabular disclosure of regulatory liabilities. Detailed information about liabilities that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. + 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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