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Derivative Instruments and Hedging Activities (Balance Sheet Disclosures) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Fair Value of Derivative Instruments |  |  |
Short-Term, Derivative Assets | $ 129 | $ 65 |
Long-Term, Derivative Assets | 85 | 70 |
Short-Term, Derivative Liabilities | 126 | 266 |
Long-Term, Derivative Liabilities | 939 | 456 |
Southern California Edison |  |  |
Fair Value of Derivative Instruments |  |  |
Short-Term, Derivative Assets | 129 | 65 |
Long-Term, Derivative Assets | 85 | 70 |
Short-Term, Derivative Liabilities | 126 | 266 |
Long-Term, Derivative Liabilities | 939 | 805 |
Southern California Edison | Commodity Contracts | Electric Utility |  |  |
Fair Value of Derivative Instruments |  |  |
Short-Term, Derivative Assets | 129 | 65 |
Long-Term, Derivative Assets | 85 | 70 |
Derivative Assets, Total | 214 | 135 |
Short-Term, Derivative Liabilities | 126 | 266 | [1]
Long-Term, Derivative Liabilities | 939 | 805 | [1]
Derivative Liabilities, Total | 1,065 | 1,071 | [1]
Net Asset (Liability) | 851 | 936 |
Southern California Edison | Commodity Contracts | Electric Utility | Economic hedges |  |  |
Fair Value of Derivative Instruments |  |  |
Short-Term, Derivative Assets | 151 | 86 |
Long-Term, Derivative Assets | 91 | 85 |
Derivative Assets, Total | 242 | 171 |
Short-Term, Derivative Liabilities | 186 | 303 | [1]
Long-Term, Derivative Liabilities | 954 | 856 | [1]
Derivative Liabilities, Total | 1,140 | 1,159 | [1]
Net Asset (Liability) | 898 | 988 |
Southern California Edison | Commodity Contracts | Electric Utility | Netting and Collateral |  |  |
Fair Value of Derivative Instruments |  |  |
Short-Term, Derivative Assets | (22) | (21) |
Long-Term, Derivative Assets | (6) | (15) |
Derivative Assets, Total | (28) | (36) |
Short-Term, Derivative Liabilities | (60) | (37) | [1]
Long-Term, Derivative Liabilities | (15) | (51) | [1]
Derivative Liabilities, Total | (75) | (88) | [1]
Net Asset (Liability) | (47) | (52) |
Edison Mission Energy | Southern California Edison | Power Purchase Agreement |  |  |
Fair Value of Derivative Instruments |  |  |
Fair value of derivative liabilities |  | $ 349 |
[1] | Included in 2011 is a power purchase agreement between SCE and EME with a fair market value of $349 million, which was eliminated in the Edison International consolidated financial statements.

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