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Fair Value Measurements (Fair Value of Long-Term Debt Recorded at Carrying Value) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value of Long-Term Debt Recorded at Carrying Value
Carrying Value	$ 9,630	$ 9,231
Fair Value	10,593	10,944
Southern California Edison
Fair Value of Long-Term Debt Recorded at Carrying Value
Carrying Value	9,227	8,828
Fair Value	$ 10,168	$ 10,505

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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