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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2019
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) | 2019 |  | 2018
Current: |  |  |
Regulatory balancing and memorandum accounts | $ | 798 |  |  | $ | 814 |
Power contracts 1 | 189 |  |  | 305 |
Other | 22 |  |  | 14 |
Total current | 1,009 |  |  | 1,133 |
Long-term: |  |  |
Deferred income taxes, net of liabilities | 4,026 |  |  | 3,589 |
Pension and other postretirement benefits | 87 |  |  | 271 |
Power contracts 1 | 434 |  |  | 700 |
Unamortized investments, net of accumulated amortization 2 | 119 |  |  | 118 |
Unamortized loss on reacquired debt | 142 |  |  | 153 |
Regulatory balancing and memorandum accounts | 981 |  |  | 360 |
Environmental remediation | 237 |  |  | 134 |
Other | 62 |  |  | 55 |
Total long-term | 6,088 |  |  | 5,380 |
Total regulatory assets | $ | 7,097 |  |  | $ | 6,513 |
Regulatory Liabilities Included on the Consolidated Balance Sheets | SCE's regulatory liabilities included on the consolidated balance sheets are:
| December 31,
(in millions) | 2019 |  | 2018
Current: |  |  |
Regulatory balancing and memorandum accounts | $ | 883 |  |  | $ | 1,080 |
Energy derivatives | 80 |  |  | 158 |
2018 GRC 1 | — |  |  | 274 |
Other | 9 |  |  | 20 |
Total current | 972 |  |  | 1,532 |
Long-term: |  |  |
Costs of removal | 2,674 |  |  | 2,769 |
Re-measurement of deferred taxes | 2,424 |  |  | 2,776 |
Recoveries in excess of ARO liabilities | 1,569 |  |  | 1,130 |
Regulatory balancing and memorandum accounts | 1,261 |  |  | 1,344 |
Other postretirement benefits | 416 |  |  | 185 |
Other 1 | 41 |  |  | 125 |
Total long-term | 8,385 |  |  | 8,329 |
Total regulatory liabilities | $ | 9,357 |  |  | $ | 9,861 |
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. In May 2019, these regulatory liabilities were reversed due to the adoption of 2018 GRC final decision. For further information, see Note 1.
Schedule of Regulatory Balancing Accounts | The following table summarizes the significant components of regulatory balancing and memorandum accounts included in the above tables of regulatory assets and liabilities:
| December 31,
(in millions) | 2019 |  | 2018
Asset (liability) |  |  |
Energy resource recovery account 1 | $ | (23 | ) |  | $ | 815 |
Portfolio allocation balancing account 1 | 537 |  |  | — |
New system generation balancing account 1 | 85 |  |  | (74 | )
Public purpose programs and energy efficiency programs | (1,235 | ) |  | (1,200 | )
Base revenue requirement balancing account | (328 | ) |  | (628 | )
Tax accounting memorandum account and pole loading balancing account | 17 |  |  | 28 |
DOE litigation memorandum account | (35 | ) |  | (69 | )
Greenhouse gas auction revenue and low carbon fuel standard revenue | (196 | ) |  | (81 | )
FERC balancing accounts | (127 | ) |  | (180 | )
Wildfire-related memorandum accounts 2 | 868 |  |  | 272 |
Other | 72 |  |  | (133 | )
Liability | $ | (365 | ) |  | $ | (1,250 | )
1 | SCE's cost-recovery mechanism for its fuel and purchased power-related costs is facilitated in three main balancing accounts, the Energy Resource Recovery Account ("ERRA"), the Portfolio Allocation Balancing Account ("PABA") and the New System Generation Balancing Account ("NSGBA"). In May 2019, the CPUC approved a PABA to determine and pro-ratably recover from responsible bundled service and departing load customers the "above-market" costs of all generation resources that are eligible for cost recovery. The ERRA and PABA balancing accounts are subject to a trigger mechanism that allows SCE to request an expeditious rate change if the sum of the ERRA balance and the bundled service customers' pro-rata share of the PABA balance 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 2020, the 4% and 5% trigger amounts are approximately $200 million and $250 million, respectively. SCE will begin recovering the combined ERRA, PABA and NSGBA undercollection from customers in rates beginning in April 2020, which will be fully recovered in April 2021.
2 The wildfire-related memorandum accounts regulatory assets represent wildfire-related costs that are probable of future recovery from customers, subject to a reasonableness review. The Fire Hazard Prevention Memorandum Account ("FHPMA") is used to track costs related to fire safety and to implement fire prevention corrective action measures in extreme and very high fire threat areas. The Catastrophic Event Memorandum Account ("CEMA") is used to track costs related to restoring service and damage repair, upon declaration of disasters by state or federal authorities. During 2018, the CPUC approved the establishment of the Wildfire Expense Memorandum Account ("WEMA") to track incremental wildfire insurance costs and uninsured wildfire-related financing, legal and claims costs. In March 2019, the CPUC approved a fire risk mitigation memorandum account to track costs related to the reduction of fire risk that are incremental to the amount in SCE's any other revenue requirement. In June 2019, the CPUC approved a wildfire mitigation plan memorandum account to track costs incurred to implement SCE's Wildfire Mitigation Plan that are not currently reflected in SCE's revenue requirements.

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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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