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Derivative Instruments and Hedging Activities (Balance Sheet Disclosures) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Fair Value of Derivative Instruments |  |
Short-Term, Derivative Assets | $ 122 | $ 129
Long-Term, Derivative Assets | 251 | 85
Short-Term, Derivative Liabilities | 152 | 126
Long-Term, Derivative Liabilities | 1,042 | 939
Southern California Edison |  |
Fair Value of Derivative Instruments |  |
Short-Term, Derivative Assets | 122 | 129
Long-Term, Derivative Assets | 251 | 85
Short-Term, Derivative Liabilities | 152 | 126
Long-Term, Derivative Liabilities | 1,042 | 939
Southern California Edison | Electric Utility |  |
Fair Value of Derivative Instruments |  |
Short-Term, Derivative Assets | 122 | 129
Long-Term, Derivative Assets | 251 | 85
Derivative Assets, Total | 373 | 214
Short-Term, Derivative Liabilities | 152 | 126
Long-Term, Derivative Liabilities | 1,042 | 939
Derivative Liabilities, Total | 1,194 | 1,065
Net Liability | 821 | 851
Fair value of derivative liabilities | 1,194 | 1,065
Southern California Edison | Electric Utility | Economic hedges |  |
Fair Value of Derivative Instruments |  |
Short-Term, Derivative Assets | 141 | 151
Long-Term, Derivative Assets | 251 | 91
Derivative Assets, Total | 392 | 242
Short-Term, Derivative Liabilities | 178 | 186
Long-Term, Derivative Liabilities | 1,045 | 954
Derivative Liabilities, Total | 1,223 | 1,140
Net Liability | 831 | 898
Fair value of derivative liabilities | 1,223 | 1,140
Southern California Edison | Electric Utility | Netting and Collateral |  |
Fair Value of Derivative Instruments |  |
Short-Term, Derivative Assets | (19) | (22)
Long-Term, Derivative Assets | 0 | (6)
Derivative Assets, Total | (19) | (28)
Short-Term, Derivative Liabilities | (19) | (22)
Long-Term, Derivative Liabilities | 0 | (6)
Derivative Liabilities, Total | (19) | (28)
Net Liability | 0 | 0
Fair value of derivative liabilities | (19) | (28)
Southern California Edison | Electric Utility | Cash collateral posted |  |
Fair Value of Derivative Instruments |  |
Short-Term, Derivative Assets | 0 | 0
Long-Term, Derivative Assets | 0 | 0
Derivative Assets, Total | 0 | 0
Short-Term, Derivative Liabilities | (7) | (38)
Long-Term, Derivative Liabilities | (3) | (9)
Derivative Liabilities, Total | (10) | (47)
Net Liability | (10) | (47)
Fair value of derivative liabilities | $ (10) | $ (47)

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