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Regulatory Assets and Liabilities (Tables) - Southern California Edison | 6 Months Ended
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Jun. 30, 2017
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, 2017 |  | December 31, 2016
Current: |  |  |
Regulatory balancing accounts | $ | 374 |  |  | $ | 135 |
Energy derivatives and other power contracts | 199 |  |  | 150 |
Unamortized investments, net of accumulated amortization | 25 |  |  | 49 |
Other | 36 |  |  | 16 |
Total current | 634 |  |  | 350 |
Long-term: |  |  |
Deferred income taxes, net of liabilities | 4,875 |  |  | 4,478 |
Pensions and other postretirement benefits | 712 |  |  | 710 |
Energy derivatives and other power contracts | 969 |  |  | 947 |
Unamortized investments, net of accumulated amortization | 78 |  |  | 80 |
San Onofre | 772 |  |  | 857 |
Unamortized loss on reacquired debt | 176 |  |  | 184 |
Regulatory balancing accounts | 72 |  |  | 66 |
Environmental remediation | 123 |  |  | 126 |
Other | 73 |  |  | 7 |
Total long-term | 7,850 |  |  | 7,455 |
Total regulatory assets | $ | 8,484 |  |  | $ | 7,805 |
Regulatory Liabilities Included on the Consolidated Balance Sheets | SCE's regulatory liabilities included on the consolidated balance sheets are:
(in millions) | June 30, 2017 |  | December 31, 2016
Current: |  |  |
Regulatory balancing accounts | $ | 822 |  |  | $ | 736 |
San Onofre MHI arbitration award 1 | 47 |  |  | — |
Other | 34 |  |  | 20 |
Total current | 903 |  |  | 756 |
Long-term: |  |  |
Costs of removal | 2,820 |  |  | 2,847 |
Recoveries in excess of ARO liabilities 2 | 1,758 |  |  | 1,639 |
Regulatory balancing accounts | 1,326 |  |  | 1,180 |
Other | 57 |  |  | 60 |
Total long-term | 5,961 |  |  | 5,726 |
Total regulatory liabilities | $ | 6,864 |  |  | $ | 6,482 |
1 | Represents SCE's net recovery from claims against MHI. See Note 11 for further discussion.
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 9 for further discussion.
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, 2017 |  | December 31, 2016
Asset (liability) |  |  |
Energy resource recovery account | $ | 228 |  |  | $ | (20 | )
New system generation balancing account | (175 | ) |  | (6 | )
Public purpose programs and energy efficiency programs | (1,064 | ) |  | (992 | )
Tax accounting memorandum account and pole loading balancing account | (197 | ) |  | (142 | )
Base rate recovery balancing account | (257 | ) |  | (426 | )
Department of Energy litigation memorandum account | (156 | ) |  | (122 | )
Greenhouse gas auction revenue | 24 |  |  | 31 |
FERC balancing accounts | (136 | ) |  | (69 | )
Other | 31 |  |  | 31 |
Liability | $ | (1,702 | ) |  | $ | (1,715 | )

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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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