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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2018
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory Assets Included on the Consolidated Balance Sheets | SCE's regulatory assets included on the consolidated balance sheets are:
| December 31,
(in millions) | 2018 |  | 2017
Current: |  |  |
Regulatory balancing accounts | $ | 814 |  |  | $ | 484 |
Power contracts 1 | 305 |  |  | 203 |
Other | 14 |  |  | 16 |
Total current | 1,133 |  |  | 703 |
Long-term: |  |  |
Deferred income taxes, net of liabilities | 3,589 |  |  | 3,143 |
Pensions and other postretirement benefits | 271 |  |  | 271 |
Power contracts 1 | 700 |  |  | 799 |
Unamortized investments, net of accumulated amortization 2 | 118 |  |  | 123 |
San Onofre 3 | — |  |  | 72 |
Unamortized loss on reacquired debt | 153 |  |  | 168 |
Regulatory balancing accounts | 360 |  |  | 143 |
Environmental remediation | 134 |  |  | 144 |
Other | 55 |  |  | 51 |
Total long-term | 5,380 |  |  | 4,914 |
Total regulatory assets | $ | 6,513 |  |  | $ | 5,617 |
Regulatory Liabilities Included on the Consolidated Balance Sheets | SCE's regulatory liabilities included on the consolidated balance sheets are:
| December 31,
(in millions) | 2018 |  | 2017
Current: |  |  |
Regulatory balancing accounts | $ | 1,080 |  |  | $ | 1,009 |
Energy derivatives | 158 |  |  | 74 |
Other 1 | 294 |  |  | 38 |
Total current | 1,532 |  |  | 1,121 |
Long-term: |  |  |
Costs of removal | 2,769 |  |  | 2,741 |
Re-measurement of deferred taxes | 2,776 |  |  | 2,892 |
Recoveries in excess of ARO liabilities | 1,130 |  |  | 1,575 |
Regulatory balancing accounts | 1,344 |  |  | 1,316 |
Other postretirement benefits | 185 |  |  | 26 |
Other 1 | 125 |  |  | 64 |
Total long-term | 8,329 |  |  | 8,614 |
Total regulatory liabilities | $ | 9,861 |  |  | $ | 9,735 |
1 | During 2018, SCE recorded CPUC revenue based on the 2017 authorized revenue requirement adjusted for the July 2017 cost of capital decision and Tax Reform pending the outcome of the 2018 GRC. SCE recorded regulatory liabilities primarily associated with these adjustments. The CPUC has authorized the establishment of a GRC memorandum account, which will make the 2018 revenue requirement ultimately adopted by the CPUC effective as of January 1, 2018. For further information, see Note 1.
Schedule of Regulatory Balancing Accounts | The following table summarizes the significant components of regulatory balancing accounts included in the above tables of regulatory assets and liabilities:
| December 31,
(in millions) | 2018 |  | 2017
Asset (liability) |  |  |
Energy resource recovery account 1 | $ | 815 |  |  | $ | 464 |
New system generation balancing account | (74 | ) |  | (197 | )
Public purpose programs and energy efficiency programs | (1,200 | ) |  | (1,145 | )
Base revenue requirement balancing account 2 | (628 | ) |  | (200 | )
Tax accounting memorandum account and pole loading balancing account 2 | 28 |  |  | (259 | )
DOE litigation memorandum account | (69 | ) |  | (156 | )
Greenhouse gas auction revenue and low carbon fuel standard revenue | (81 | ) |  | (46 | )
FERC balancing accounts | (180 | ) |  | (205 | )
Catastrophic event memorandum account | 144 |  |  | 102 |
Wildfire expense memorandum account 3 | 128 |  |  | — |
Other | (133 | ) |  | (56 | )
Liability | $ | (1,250 | ) |  | $ | (1,698 | )
1 | Energy resource recovery account ("ERRA") balancing account is subject to a trigger mechanism that allows SCE to request an expeditious rate change if the ERRA balancing account overcollection or undercollection either exceeds 5% of SCE's prior year generation rate revenue or exceeds 4% of SCE's prior year generation rate revenue and SCE does not expect the overcollection or undercollection to fall below 4% within 120 days. For 2019, the 4% and 5% trigger amounts are approximately $213 million and $266 million, respectively. SCE anticipates to recover the ERRA undercollection from customer in rates beginning in April 2019. For further information of ERRA trigger mechanism, see "Business—SCE—Overview of Ratemaking Process."
2 | During 2018, $263 million of 2017 incremental tax benefits were reclassified from the tax accounting memorandum account to the base revenue requirement balancing account (to be refunded to customers in 2019).
3 | During 2018, the CPUC established a wildfire expense memorandum account ("WEMA") to track wildfire-related costs including insurance premiums in excess of amounts that ultimately will be approved in the 2018 GRC decision. See Note 12 for further information.

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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