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Regulatory Assets and Liabilities (Tables) - Southern California Edison | 6 Months Ended
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Jun. 30, 2016
Regulatory Assets [Line Items] |
Regulatory Assets Included on the Consolidated Balance Sheets | SCE's regulatory assets included on the consolidated balance sheets are:
(in millions) | June 30, 2016 |  | December 31, 2015
Current: |  |  |
Regulatory balancing accounts | $ | 309 |  |  | $ | 382 |
Energy derivatives | 135 |  |  | 159 |
Other | 34 |  |  | 19 |
Total current | 478 |  |  | 560 |
Long-term: |  |  |
Deferred income taxes, net | 4,176 |  |  | 3,757 |
Pensions and other postretirement benefits | 836 |  |  | 849 |
Energy derivatives | 1,041 |  |  | 1,027 |
Unamortized investments, net | 156 |  |  | 182 |
San Onofre | 942 |  |  | 1,043 |
Unamortized loss on reacquired debt | 193 |  |  | 201 |
Regulatory balancing accounts | 49 |  |  | 36 |
Environmental remediation | 128 |  |  | 129 |
Other | 271 |  |  | 288 |
Total long-term | 7,792 |  |  | 7,512 |
Total regulatory assets | $ | 8,270 |  |  | $ | 8,072 |
Regulatory Liabilities Included on the Consolidated Balance Sheets | SCE's regulatory liabilities included on the consolidated balance sheets are:
(in millions) | June 30, 2016 |  | December 31, 2015
Current: |  |  |
Regulatory balancing accounts | $ | 1,050 |  |  | $ | 1,106 |
Other | 22 |  |  | 22 |
Total current | 1,072 |  |  | 1,128 |
Long-term: |  |  |
Costs of removal | 2,825 |  |  | 2,781 |
Recoveries in excess of ARO liabilities 1 | 1,740 |  |  | 1,502 |
Regulatory balancing accounts | 1,392 |  |  | 1,314 |
Other | 60 |  |  | 79 |
Total long-term | 6,017 |  |  | 5,676 |
Total regulatory liabilities | $ | 7,089 |  |  | $ | 6,804 |
1 | Represents the cumulative differences between ARO expenses and amounts collected in rates primarily for the decommissioning of the 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 9.
Schedule of 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) | June 30, 2016 |  | December 31, 2015
Asset (liability) |  |  |
Energy resource recovery account | $ | (252 | ) |  | $ | (439 | )
New system generation balancing account | (195 | ) |  | (171 | )
Public purpose programs and energy efficiency programs | (828 | ) |  | (683 | )
Tax accounting memorandum account and pole loading balancing account | (68 | ) |  | (248 | )
Base rate recovery balancing account | (535 | ) |  | (319 | )
Department of Energy litigation memorandum account 1 | (122 | ) |  | — |
Greenhouse gas auction revenue | (4 | ) |  | (75 | )
FERC balancing accounts | 40 |  |  | 74 |
Other | (120 | ) |  | (141 | )
Liability | $ | (2,084 | ) |  | $ | (2,002 | )
1 | Represents a refund from the Department of Energy's failure to meet its obligation to begin accepting spent nuclear fuel from San Onofre. See "Note 11. Commitments and Contingencies—Contingencies—Spent Nuclear Fuel" for further discussion.

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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 + Details
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