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Derivative Instruments (Tables) | 3 Months Ended
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Mar. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Fair Value of Derivative Instruments | The following table summarizes the gross and net fair values of SCE's commodity derivative instruments:
|  | March 31, 2013 |  |
|  | Derivative Assets |  | Derivative Liabilities |  |
(in millions) |  | Short-Term |  | Long-Term |  | Subtotal |  | Short-Term |  | Long-Term |  | Subtotal |  | Net Liability
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 133 |  |  | $ | 85 |  |  | $ | 218 |  |  | $ | 149 |  |  | $ | 1,025 |  |  | $ | 1,174 |  |  | $ | 956 |
Gross amounts offset in the consolidated balance sheets |  | (22 | ) |  | (4 | ) |  | (26 | ) |  | (22 | ) |  | (4 | ) |  | (26 | ) |  | — |
Cash collateral posted 1 |  | — |  |  | — |  |  | — |  |  | (20 | ) |  | (7 | ) |  | (27 | ) |  | (27 | )
Net amounts presented in the consolidated balance sheets |  | $ | 111 |  |  | $ | 81 |  |  | $ | 192 |  |  | $ | 107 |  |  | $ | 1,014 |  |  | $ | 1,121 |  |  | $ | 929 |
|  | December 31, 2012 |  |
|  | Derivative Assets |  | Derivative Liabilities |  |
(in millions) |  | Short-Term |  | Long-Term |  | Subtotal |  | Short-Term |  | Long-Term |  | Subtotal |  | Net Liability
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 151 |  |  | $ | 91 |  |  | $ | 242 |  |  | $ | 186 |  |  | $ | 954 |  |  | $ | 1,140 |  |  | $ | 898 |
Gross amounts offset in the consolidated balance sheets |  | (22 | ) |  | (6 | ) |  | (28 | ) |  | (22 | ) |  | (6 | ) |  | (28 | ) |  | — |
Cash collateral posted 1 |  | — |  |  | — |  |  | — |  |  | (38 | ) |  | (9 | ) |  | (47 | ) |  | (47 | )
Net amounts presented in the consolidated balance sheets |  | $ | 129 |  |  | $ | 85 |  |  | $ | 214 |  |  | $ | 126 |  |  | $ | 939 |  |  | $ | 1,065 |  |  | $ | 851 |
1 | In addition, SCE has posted $10 million and $8 million of collateral that is not offset against the derivative liabilities and is reflected in "Other current assets" on the March 31, 2013 and December 31, 2012 consolidated balance sheets, respectively.
Summarization of Economic Hedging Activities | The following table summarizes the components of SCE's economic hedging activity:
|  | Three months ended March 31,
(in millions) |  | 2013 |  | 2012
Realized losses |  | $ | (16 | ) |  | $ | (55 | )
Unrealized losses |  | (54 | ) |  | (361 | )
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 | March 31, 2013 |  | December 31, 2012
Electricity options, swaps and forwards | GWh | 13,067 |  |  | 15,884
Natural gas options, swaps and forwards | Bcf | 65 |  |  | 100
Congestion revenue rights | GWh | 138,697 |  |  | 149,774
Tolling arrangements | GWh | 100,810 |  |  | 101,485

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