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Derivative Instruments (Tables) | 3 Months Ended
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Mar. 31, 2014
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:
|  | March 31, 2014 |  |
|  | Derivative Assets |  | Derivative Liabilities |  |
(in millions) |  | Short-Term |  | Long-Term |  | Subtotal |  | Short-Term |  | Long-Term |  | Subtotal |  | Net Liability
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 135 |  |  | $ | 240 |  |  | $ | 375 |  |  | $ | 170 |  |  | $ | 987 |  |  | $ | 1,157 |  |  | $ | 782 |
Gross amounts offset in the consolidated balance sheets |  | (23 | ) |  | — |  |  | (23 | ) |  | (23 | ) |  | — |  |  | (23 | ) |  | — |
Cash collateral posted 1 |  | — |  |  | — |  |  | — |  |  | (4 | ) |  | (2 | ) |  | (6 | ) |  | (6 | )
Net amounts presented in the consolidated balance sheets |  | $ | 112 |  |  | $ | 240 |  |  | $ | 352 |  |  | $ | 143 |  |  | $ | 985 |  |  | $ | 1,128 |  |  | $ | 776 |
|  | December 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 |  | $ | 141 |  |  | $ | 251 |  |  | $ | 392 |  |  | $ | 178 |  |  | $ | 1,045 |  |  | $ | 1,223 |  |  | $ | 831 |
Gross amounts offset in the consolidated balance sheets |  | (19 | ) |  | — |  |  | (19 | ) |  | (19 | ) |  | — |  |  | (19 | ) |  | — |
Cash collateral posted 1 |  | — |  |  | — |  |  | — |  |  | (7 | ) |  | (3 | ) |  | (10 | ) |  | (10 | )
Net amounts presented in the consolidated balance sheets |  | $ | 122 |  |  | $ | 251 |  |  | $ | 373 |  |  | $ | 152 |  |  | $ | 1,042 |  |  | $ | 1,194 |  |  | $ | 821 |
1 | In addition, at March 31, 2014 and December 31, 2013, SCE had posted $7 million and $19 million, respectively, of collateral that is not offset against derivative liabilities and is reflected in "Other current assets" on the consolidated balance sheets.
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, 2014 |  | December 31, 2013
Electricity options, swaps and forwards |  | GWh |  | 5,086 |  |  | 6,274
Natural gas options, swaps and forwards |  | Bcf |  | 8 |  |  | 12
Congestion revenue rights |  | GWh |  | 135,714 |  |  | 149,234
Tolling arrangements |  | GWh |  | 86,248 |  |  | 87,991
Southern California Edison |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Summarization of Economic Hedging Activities | The following table summarizes the components of SCE's economic hedging activity:
|  | Three months ended March 31,
(in millions) |  | 2014 |  | 2013
Realized losses |  | $ | (37 | ) |  | $ | (16 | )
Unrealized gains (losses) |  | 52 |  |  | (54 | )

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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 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: 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=7476318&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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