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Derivative Instruments (Tables) - Southern California Edison | 6 Months Ended
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Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Fair Value of Derivative Instruments | The following table summarizes the gross and net fair values of SCE's commodity derivative instruments:
|  | June 30, 2016 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Liability
(in millions) |  | Short-Term |  | Long-Term |  | Subtotal |  | Short-Term |  | Long-Term |  | Subtotal |
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 66 |  |  | $ | 69 |  |  | $ | 135 |  |  | $ | 196 |  |  | $ | 1,100 |  |  | $ | 1,296 |  |  | $ | 1,161 |
Gross amounts offset in the consolidated balance sheets |  | (1 | ) |  | — |  |  | (1 | ) |  | (1 | ) |  | — |  |  | (1 | ) |  | — |
Cash collateral posted 1 |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net amounts presented in the consolidated balance sheets |  | $ | 65 |  |  | $ | 69 |  |  | $ | 134 |  |  | $ | 195 |  |  | $ | 1,100 |  |  | $ | 1,295 |  |  | $ | 1,161 |
|  | 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 the 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 |
1 | In addition, at June 30, 2016, SCE received $4 million of collateral that is not offset against derivative assets and is reflected in "Other current liabilities" on the consolidated balance sheets. At December 31, 2015, SCE had posted $31 million of collateral that is not offset against derivative liabilities and is reflected in "Other current assets" on the consolidated balance sheets.
Summarization of Economic Hedging Activities | The following table summarizes the components of SCE's economic hedging activity:
|  | Three months ended June 30, |  | Six months ended June 30,
(in millions) |  | 2016 |  | 2015 |  | 2016 |  | 2015
Realized losses |  | $ | (25 | ) |  | $ | (39 | ) |  | $ | (52 | ) |  | $ | (75 | )
Unrealized gains (losses) |  | 72 |  |  | (16 | ) |  | 8 |  |  | (85 | )
Notional Volumes of Derivative Instruments | The following table summarizes the notional volumes of derivatives used for SCE hedging activities:
|  |  |  | Economic Hedges
Commodity |  | Unit of Measure |  | June 30, 2016 |  | December 31, 2015
Electricity options, swaps and forwards |  | GWh |  | 4,980 |  |  | 6,221
Natural gas options, swaps and forwards |  | Bcf |  | 4 |  |  | 32
Congestion revenue rights |  | GWh |  | 80,094 |  |  | 109,740
Tolling arrangements |  | GWh |  | 65,998 |  |  | 70,663

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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=64837297&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=64837297&loc=SL5618551-113959 + Details
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