Preferred and Preference Stock of Utility (Schedule of Preferred and Preference Stock) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Preferred and Preference Stock of Utility
Preferred and preference stock of utility	$ 1,753	$ 1,759
Southern California Edison
Preferred and Preference Stock of Utility
Preferred and preference stock of utility	1,795	1,795
Southern California Edison | 4.08% Series
Preferred and Preference Stock of Utility
Shares Outstanding (shares)	650,000
Redemption Price (in dollars per share)	$ 25.5
Preferred stock before issuance costs	16	16
Preference stock (as a percent)	4.08%
Southern California Edison | 4.24% Series
Preferred and Preference Stock of Utility
Shares Outstanding (shares)	1,200,000
Redemption Price (in dollars per share)	$ 25.8
Preferred stock before issuance costs	30	30
Preference stock (as a percent)	4.24%
Southern California Edison | 4.32% Series
Preferred and Preference Stock of Utility
Shares Outstanding (shares)	1,653,429
Redemption Price (in dollars per share)	$ 28.75
Preferred stock before issuance costs	41	41
Preference stock (as a percent)	4.32%
Southern California Edison | 4.78% Series
Preferred and Preference Stock of Utility
Shares Outstanding (shares)	1,296,769
Redemption Price (in dollars per share)	$ 25.8
Preferred stock before issuance costs	33	33
Preference stock (as a percent)	4.78%
Southern California Edison | Preferred and Preference Stock
Preferred and Preference Stock of Utility
Preferred stock before issuance costs	1,795	1,795
Less issuance costs	(42)	(36)
Preferred and preference stock of utility	1,753	1,759
Southern California Edison | 5.07% Series A (variable and noncumulative)
Preferred and Preference Stock of Utility
Shares Outstanding (shares)	3,250,000
Redemption Price (in dollars per share)	$ 100
Preferred stock before issuance costs	325	325
Preference stock (as a percent)	4.32%
Southern California Edison | 6.125% Series B (noncumulative)
Preferred and Preference Stock of Utility
Shares Outstanding (shares)	2,000,000
Redemption Price (in dollars per share)	$ 100
Preferred stock before issuance costs	0	200
Preference stock (as a percent)	6.125%
Southern California Edison | 6.00% Series C (noncumulative)
Preferred and Preference Stock of Utility
Shares Outstanding (shares)	2,000,000
Redemption Price (in dollars per share)	$ 100
Preferred stock before issuance costs	0	200
Preference stock (as a percent)	6.00%
Southern California Edison | 6.50% Series D (cumulative)
Preferred and Preference Stock of Utility
Shares Outstanding (shares)	1,250,000
Redemption Price (in dollars per share)	$ 100
Preferred stock before issuance costs	125	125
Preference stock (as a percent)	6.50%
Southern California Edison | 6.25% Series E (cumulative)
Preferred and Preference Stock of Utility
Shares Outstanding (shares)	350,000
Redemption Price (in dollars per share)	$ 1,000
Preferred stock before issuance costs	350	350
Preference stock (as a percent)	6.25%
Southern California Edison | 5.625% Series F (cumulative)
Preferred and Preference Stock of Utility
Shares Outstanding (shares)	190,004
Redemption Price (in dollars per share)	$ 2,500
Preferred stock before issuance costs	475	475
Preference stock (as a percent)	5.625%
Southern California Edison | 5.10% Series G [Member]
Preferred and Preference Stock of Utility
Shares Outstanding (shares)	160,004
Redemption Price (in dollars per share)	$ 2,500
Preferred stock before issuance costs	$ 400	$ 0
Preference stock (as a percent)	5.10%