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Derivative Instruments (Balance Sheet Disclosures) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Fair Value of Derivative Instruments |  |  |  |
Short-Term, Derivative Assets | $ 111 |  | $ 129 |
Long-Term, Derivative Assets | 81 |  | 85 |
Short-Term, Derivative Liabilities | 107 |  | 126 |
Long-Term, Derivative Liabilities | 1,014 |  | 939 |
Southern California Edison |  |  |  |
Fair Value of Derivative Instruments |  |  |  |
Short-Term, Derivative Assets | 111 |  | 129 |
Long-Term, Derivative Assets | 81 |  | 85 |
Short-Term, Derivative Liabilities | 107 |  | 126 |
Long-Term, Derivative Liabilities | 1,014 |  | 939 |
Southern California Edison | Commodity Contracts | Electric Utility |  |  |  |
Fair Value of Derivative Instruments |  |  |  |
Short-Term, Derivative Assets | 111 |  | 129 |
Long-Term, Derivative Assets | 81 |  | 85 |
Derivative Assets, Total | 192 |  | 214 |
Short-Term, Derivative Liabilities | 107 |  | 126 |
Long-Term, Derivative Liabilities | 1,014 |  | 939 |
Derivative Liabilities, Total | 1,121 |  | 1,065 | [1]
Net Asset (Liability) | 929 |  | 851 |
Southern California Edison | Commodity Contracts | Electric Utility | Economic hedges |  |  |  |
Fair Value of Derivative Instruments |  |  |  |
Short-Term, Derivative Assets | 133 |  | 151 |
Long-Term, Derivative Assets | 85 |  | 91 |
Derivative Assets, Total | 218 |  | 242 |
Short-Term, Derivative Liabilities | 149 |  | 186 |
Long-Term, Derivative Liabilities | 1,025 |  | 954 |
Derivative Liabilities, Total | 1,174 |  | 1,140 | [1]
Net Asset (Liability) | 956 |  | 898 |
Southern California Edison | Commodity Contracts | Electric Utility | Netting and Collateral |  |  |  |
Fair Value of Derivative Instruments |  |  |  |
Short-Term, Derivative Assets | (22) |  | (22) |
Long-Term, Derivative Assets | (4) |  | (6) |
Derivative Assets, Total | (26) |  | (28) |
Short-Term, Derivative Liabilities | (22) |  | (22) |
Long-Term, Derivative Liabilities | (4) |  | (6) |
Derivative Liabilities, Total | (26) |  | (28) | [1]
Net Asset (Liability) | 0 |  | 0 |
Southern California Edison | Commodity Contracts | Electric Utility | Cash Collateral Posted |  |  |  |
Fair Value of Derivative Instruments |  |  |  |
Short-Term, Derivative Assets | 0 | [1] | 0 | [1]
Long-Term, Derivative Assets | 0 | [1] | 0 | [1]
Derivative Assets, Total | 0 | [1] | 0 | [1]
Short-Term, Derivative Liabilities | (20) | [1] | (38) | [1]
Long-Term, Derivative Liabilities | (7) | [1] | (9) | [1]
Derivative Liabilities, Total | (27) | [1] | (47) | [1]
Net Asset (Liability) | (27) | [1] | (47) | [1]
Southern California Edison | Power Purchase Agreement |  |  |  |
Fair Value of Derivative Instruments |  |  |  |
Fair value of derivative liabilities | $ 10 |  | $ 8 |
[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.

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