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Derivative Instruments (Tables) - Southern California Edison | 12 Months Ended
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Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value | The following table summarizes the gross and net fair values of SCE's commodity derivative instruments:
|  | December 31, 2015 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Liability
(in millions) |  | Short-Term |  | Long-Term |  | Subtotal |  | Short-Term |  | Long-Term |  | Subtotal |
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 81 |  |  | $ | 84 |  |  | $ | 165 |  |  | $ | 235 |  |  | $ | 1,100 |  |  | $ | 1,335 |  |  | $ | 1,170 |
Gross amounts offset in consolidated balance sheets |  | (2 | ) |  | — |  |  | (2 | ) |  | (2 | ) |  | — |  |  | (2 | ) |  | — |
Cash collateral posted 1 |  | — |  |  | — |  |  | — |  |  | (15 | ) |  | — |  |  | (15 | ) |  | (15 | )
Net amounts presented in the consolidated balance sheets |  | $ | 79 |  |  | $ | 84 |  |  | $ | 163 |  |  | $ | 218 |  |  | $ | 1,100 |  |  | $ | 1,318 |  |  | $ | 1,155 |
|  | December 31, 2014 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Liability
(in millions) |  | Short-Term |  | Long-Term |  | Subtotal |  | Short-Term |  | Long-Term |  | Subtotal |
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 104 |  |  | $ | 219 |  |  | $ | 323 |  |  | $ | 259 |  |  | $ | 1,052 |  |  | $ | 1,311 |  |  | $ | 988 |
Gross amounts offset in consolidated balance sheets |  | (2 | ) |  | — |  |  | (2 | ) |  | (2 | ) |  | — |  |  | (2 | ) |  | — |
Cash collateral posted 1 |  | — |  |  | — |  |  | — |  |  | (61 | ) |  | — |  |  | (61 | ) |  | (61 | )
Net amounts presented in the consolidated balance sheets |  | $ | 102 |  |  | $ | 219 |  |  | $ | 321 |  |  | $ | 196 |  |  | $ | 1,052 |  |  | $ | 1,248 |  |  | $ | 927 |
1 | In addition, at December 31, 2015 and 2014, SCE had posted $31 million and $36 million, respectively, of collateral that is not offset against derivative liabilities and is reflected in "Other current assets" on the consolidated balance sheets.
Derivative Instruments, Gain (Loss) | The following table summarizes the components of SCE's economic hedging activity:
|  | Years ended December 31,
(in millions) |  | 2015 |  | 2014 |  | 2013
Realized losses |  | $ | (148 | ) |  | $ | (57 | ) |  | $ | (56 | )
Unrealized (losses) gains |  | (182 | ) |  | (147 | ) |  | 93 |
Notional Volumes of Derivative Instruments | The following table summarizes the notional volumes of derivatives used for SCE hedging activities:
|  | Economic Hedges
| Unit of | December 31,
Commodity | Measure | 2015 |  | 2014
Electricity options, swaps and forwards | GWh | 6,221 |  |  | 3,618
Natural gas options, swaps and forwards | Bcf | 32 |  |  | 83
Congestion revenue rights | GWh | 109,740 |  |  | 122,859
Tolling arrangements | GWh | 70,663 |  |  | 79,989

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 + Details
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