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Regulatory Assets and Liabilities | 3 Months Ended
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Mar. 31, 2013
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory Assets and Liabilities | Regulatory Assets and Liabilities Regulatory Assets 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 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 The entire disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit. + References No definition available. + Details
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