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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
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) | 2017 |  | 2016
Current: |  |  |
Regulatory balancing accounts | $ | 484 |  |  | $ | 135 |
Power contracts and energy derivatives | 203 |  |  | 150 |
Unamortized investments, net of accumulated amortization | 5 |  |  | 49 |
Other | 11 |  |  | 16 |
Total current | 703 |  |  | 350 |
Long-term: |  |  |
Deferred income taxes, net of liabilities | 3,143 |  |  | 4,478 |
Pensions and other postretirement benefits | 271 |  |  | 710 |
Power contracts and energy derivatives | 799 |  |  | 947 |
Unamortized investments, net of accumulated amortization | 123 |  |  | 80 |
San Onofre | 72 |  |  | 857 |
Unamortized loss on reacquired debt | 168 |  |  | 184 |
Regulatory balancing accounts | 143 |  |  | 66 |
Environmental remediation | 144 |  |  | 126 |
Other | 51 |  |  | 7 |
Total long-term | 4,914 |  |  | 7,455 |
Total regulatory assets | $ | 5,617 |  |  | $ | 7,805 |
Regulatory Liabilities Included on the Consolidated Balance Sheets | SCE's regulatory liabilities included on the consolidated balance sheets are:
| December 31,
(in millions) | 2017 |  | 2016
Current: |  |  |
Regulatory balancing accounts | $ | 1,009 |  |  | $ | 736 |
Energy derivatives | 74 |  |  | — |
Other | 38 |  |  | 20 |
Total current | 1,121 |  |  | 756 |
Long-term: |  |  |
Costs of removal | 2,741 |  |  | 2,847 |
Re-measurement of deferred taxes | 2,892 |  |  | — |
Recoveries in excess of ARO liabilities | 1,575 |  |  | 1,639 |
Regulatory balancing accounts | 1,316 |  |  | 1,180 |
Other postretirement benefits | 26 |  |  | — |
Other | 64 |  |  | 60 |
Total long-term | 8,614 |  |  | 5,726 |
Total regulatory liabilities | $ | 9,735 |  |  | $ | 6,482 |
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) | 2017 |  | 2016
Asset (liability) |  |  |
Energy resource recovery account | $ | 464 |  |  | $ | (20 | )
New system generation balancing account | (197 | ) |  | (6 | )
Public purpose programs and energy efficiency programs | (1,145 | ) |  | (992 | )
Base revenue requirement balancing account | (200 | ) |  | (426 | )
Tax accounting memorandum account and pole loading balancing account | (259 | ) |  | (142 | )
DOE litigation memorandum account | (156 | ) |  | (122 | )
Greenhouse gas auction revenue | (22 | ) |  | 31 |
FERC balancing accounts | (205 | ) |  | (69 | )
Other | 22 |  |  | 31 |
Liability | $ | (1,698 | ) |  | $ | (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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- 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://www.xbrl.org/2003/role/presentationRef -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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