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Fair Value Measurements (Fair Value of Long-Term Debt Recorded at Carrying Value) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value of Long-Term Debt Recorded at Carrying Value
Long-term debt, including current portion, Carrying Value	$ 9,231	$ 8,834
Long-term debt, including current portion, Fair Value	10,944	10,548
Southern California Edison
Fair Value of Long-Term Debt Recorded at Carrying Value
Long-term debt, including current portion, Carrying Value	8,828	8,431
Long-term debt, including current portion, Fair Value	$ 10,505	$ 10,129

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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