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Regulatory Assets and Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2021
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
(in millions) |  | 2021 |  | 2020
Current: |  | ​ |  |  | ​ |
Regulatory balancing and memorandum accounts | ​ | $ | 1,367 | ​ | $ | 1,127
Power contracts | ​ |  | 167 | ​ |  | 165
Other | ​ |  | 19 | ​ |  | 22
Total current | ​ |  | 1,553 | ​ |  | 1,314
Long-term: | ​ |  |  | ​ |  |
Deferred income taxes, net of liabilities | ​ |  | 4,617 | ​ |  | 4,475
Pension and other postretirement benefits | ​ |  | — | ​ |  | 12
Power contracts | ​ |  | 104 | ​ |  | 239
Unamortized investments, net of accumulated amortization | ​ |  | 113 | ​ |  | 114
Unamortized loss on reacquired debt | ​ |  | 124 | ​ |  | 133
Regulatory balancing and memorandum accounts | ​ |  | 1,734 | ​ |  | 1,794
Environmental remediation | ​ |  | 246 | ​ |  | 247
Recovery assets1 | ​ | ​ | 328 | ​ | ​ | —
Other | ​ |  | 120 | ​ |  | 106
Total long-term | ​ |  | 7,386 | ​ |  | 7,120
Total regulatory assets | ​ | $ | 8,939 | ​ | $ | 8,434
1 | Represents the balance associated with the AB 1054 Excluded Capital Expenditures related Recovery Properties and prudently incurred financing costs securitized in 2021 with issuance of the associated bond. The recovery period is until 2043, when the bonds and interest are paid in full. For further details, see Note 3.
Regulatory liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
(in millions) |  | 2021 |  | 2020
Current: |  | ​ |  |  | ​ |
Regulatory balancing and memorandum accounts | ​ | $ | 347 | ​ | $ | 471
Energy derivatives | ​ |  | 205 | ​ |  | 87
Other | ​ |  | 31 | ​ |  | 11
Total current | ​ |  | 583 | ​ |  | 569
Long-term: | ​ |  |  | ​ |  |
Cost of removal | ​ |  | 2,735 | ​ |  | 2,595
Re-measurement of deferred taxes | ​ |  | 2,332 | ​ |  | 2,283
Recoveries in excess of ARO liabilities1 | ​ |  | 2,047 | ​ |  | 1,930
Regulatory balancing and memorandum accounts | ​ |  | 736 | ​ |  | 1,062
Other postretirement benefits | ​ |  | 679 | ​ |  | 671
Other | ​ |  | 55 | ​ |  | 48
Total long-term | ​ |  | 8,584 | ​ |  | 8,589
Total regulatory liabilities | ​ | $ | 9,167 | ​ | $ | 9,158
1 | 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.
Schedule of Regulatory Balancing Accounts | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
(in millions) |  | 2021 |  | 2020
Asset (liability) |  | ​ |  |  | ​ |
Energy resource recovery account | ​ | $ | 348 | ​ | $ | (89)
Portfolio allocation balancing account | ​ |  | 98 | ​ |  | 497
New system generation balancing account | ​ |  | 57 | ​ |  | (10)
Public purpose programs and energy efficiency programs | ​ |  | (1,174) | ​ |  | (1,130)
Base revenue requirement balancing account | ​ |  | 784 | ​ |  | 622
GRC wildfire mitigation balancing accounts1 | ​ | ​ | 48 | ​ | ​ | —
Residential uncollectibles balancing account2 | ​ | ​ | 209 | ​ | ​ | —
Greenhouse gas auction revenue and low carbon fuel standard revenue | ​ |  | (254) | ​ |  | (125)
FERC balancing accounts | ​ |  | 3 | ​ |  | 12
Wildfire and drought restoration accounts3 | ​ |  | 287 | ​ |  | 361
Wildfire-related memorandum accounts4 | ​ | ​ | 1,274 | ​ | ​ | 1,104
COVID-19-related memorandum accounts | ​ | ​ | 86 | ​ | ​ | 176
Customer service re-platform memorandum account5 | ​ | ​ | 101 | ​ | ​ | 30
Tax accounting memorandum account and pole loading balancing account | ​ | ​ | 204 | ​ | ​ | (35)
Other | ​ |  | (53) | ​ |  | (25)
Asset | ​ | $ | 2,018 | ​ | $ | 1,388
1 | The August 2021 final 2021 GRC decision approved the establishment of the vegetation management balancing account to track vegetation management expenses up to 115% of amounts authorized, the wildfire risk mitigation balancing account to track the costs of SCE's Wildfire Covered Conductor Program up to 110% of amounts authorized and the risk management balancing account to track the authorized costs of wildfire insurance. If spending is less than authorized, SCE will refund those amounts to customers. If spending is within the specified threshold, if any, for each balancing account, SCE will recover those costs from customers. Amounts above the specified threshold, or above amounts authorized if a higher threshold was not established, for each balancing account may be eligible for deferral to wildfire-related memorandum accounts.
2 | In November 2020, the CPUC approved the establishment of the residential uncollectibles balancing account ("RUBA"), to track the difference (positive or negative) between the recorded uncollectibles expense for all customer groups and the total authorized uncollectibles revenue collected from all customers subject to a cap equal to the actual recorded uncollectibles expense for residential customers.
3 | The wildfire and drought restoration accounts regulatory assets represent restoration costs that are recorded in a Catastrophic Event Memorandum Account ("CEMA").
4 | 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 Wildfire Expense Memorandum Account ("WEMA") is used to track incremental wildfire insurance costs and uninsured wildfire-related financing, legal and claims costs. During 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, a Grid Safety and Resiliency Program Memorandum Account ("GSRPMA") to track the costs of SCE's GS&RP that are incremental to costs approved for recovery in SCE's 2018 GRC and a fire risk mitigation memorandum account to track costs related to the reduction of fire risk that are incremental to costs approved for recovery in SCE's 2018 GRC that are not tracked in any other wildfire-related memorandum account. Revenue requirements of $326 million for 2021 expenses previously deferred as wildfire-related memorandum accounts and wildfire and drought restoration accounts were transferred to wildfire mitigation balancing accounts on approval of the 2021 GRC. The amount recorded to wildfire mitigation balancing accounts represents the difference between costs tracked in the balancing accounts and authorized revenues for those costs recorded to the base revenue requirement balancing account.
5 | CSRP memorandum account was established in the 2018 GRC to track costs for implementation of a new customer service system 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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