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Regulatory Assets and Liabilities | 9 Months Ended
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Sep. 30, 2018
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory Assets and Liabilities | Regulatory Assets and Liabilities Regulatory Assets SCE's regulatory assets included on the consolidated balance sheets are:
(in millions) | September 30, 2018 |  | December 31, 2017
Current: |  |  |
Regulatory balancing accounts | $ | 694 |  |  | $ | 484 |
Power contracts and energy derivatives | 205 |  |  | 203 |
Other | 14 |  |  | 16 |
Total current | 913 |  |  | 703 |
Long-term: |  |  |
Deferred income taxes, net of liabilities | 3,411 |  |  | 3,143 |
Pensions and other postretirement benefits | 262 |  |  | 271 |
Power contracts and energy derivatives | 635 |  |  | 799 |
Unamortized investments, net of accumulated amortization | 116 |  |  | 123 |
San Onofre 1 | — |  |  | 72 |
Unamortized loss on reacquired debt | 157 |  |  | 168 |
Regulatory balancing accounts | 204 |  |  | 143 |
Environmental Remediation | 135 |  |  | 144 |
Wildfire insurance costs 2 | 63 |  |  | — |
Other | 63 |  |  | 51 |
Total long-term | 5,046 |  |  | 4,914 |
Total regulatory assets | $ | 5,959 |  |  | $ | 5,617 |
1 | In accordance with the Revised San Onofre Settlement Agreement, SCE wrote down the San Onofre regulatory asset and applied $72 million of the U.S. Department of Energy ("DOE") proceeds, previously reflected as a regulatory liability in the DOE litigation memorandum account, against the remaining San Onofre regulatory asset. See Note 12 for further information.
2 | SCE requested approval from the CPUC to track and recover wildfire related costs including insurance premiums in excess of the amounts that will be ultimately approved in the 2018 GRC decision. See Note 12 for further information.
Regulatory Liabilities SCE's regulatory liabilities included on the consolidated balance sheets are:
(in millions) | September 30, 2018 |  | December 31, 2017
Current: |  |  |
Regulatory balancing accounts | $ | 1,273 |  |  | $ | 1,009 |
Energy derivatives | 41 |  |  | 74 |
Other 1 | 285 |  |  | 38 |
Total current | 1,599 |  |  | 1,121 |
Long-term: |  |  |
Costs of removal | 2,802 |  |  | 2,741 |
Re-measurement of deferred taxes | 2,796 |  |  | 2,892 |
Recoveries in excess of ARO liabilities 2 | 1,470 |  |  | 1,575 |
Regulatory balancing accounts | 1,333 |  |  | 1,316 |
Other postretirement benefits | 26 |  |  | 26 |
Other | 36 |  |  | 64 |
Total long-term | 8,463 |  |  | 8,614 |
Total regulatory liabilities | $ | 10,062 |  |  | $ | 9,735 |
1 | During the nine months ended September 30, 2018, SCE recorded CPUC revenue based on the 2017 authorized revenue requirements adjusted for the July 2017 cost of capital decision and Tax Reform pending the outcome of the 2018 GRC. SCE recorded a regulatory liability primarily associated with these adjustments.
2 | Represents the cumulative differences between ARO expenses and amounts collected in rates primarily for the decommissioning of SCE's nuclear generation facilities. Decommissioning costs recovered through rates are primarily placed in nuclear decommissioning trusts. This regulatory liability also represents the deferral of realized and unrealized gains and losses on the nuclear decommissioning trust investments. See Note 10 for further discussion.
Net Regulatory Balancing Accounts The following table summarizes the significant components of regulatory balancing accounts included in the above tables of regulatory assets and liabilities:
(in millions) | September 30, 2018 |  | December 31, 2017
Asset (liability) |  |  |
Energy resource recovery account | $ | 690 |  |  | $ | 464 |
New system generation balancing account | (98 | ) |  | (197 | )
Public purpose programs and energy efficiency programs | (1,283 | ) |  | (1,145 | )
Tax accounting memorandum account and pole loading balancing account | 31 |  |  | (259 | )
Base revenue requirement balancing account | (678 | ) |  | (200 | )
DOE litigation memorandum account 1 | (69 | ) |  | (156 | )
Greenhouse gas auction revenue | 6 |  |  | (22 | )
FERC balancing accounts | (298 | ) |  | (205 | )
Catastrophic event memorandum account | 133 |  |  | 102 |
Other | (142 | ) |  | (80 | )
Liability | $ | (1,708 | ) |  | $ | (1,698 | )
1 | Represents proceeds from the DOE resulting from its failure to meet its obligation to begin accepting spent nuclear fuel from San Onofre. See Note 12 for further discussion.

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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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