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Related Party Transactions (Textual) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Edison Mission Energy
Related Party Transaction [Line Items]
Revenue from Related Parties	$ 7	$ 5	$ 7
Southern California Edison \| Edison International
Related Party Transaction [Line Items]
Revenue from Related Parties	$ 4	$ 3	$ 3

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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