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, 2014	Dec. 31, 2013
Preferred and Preference Stock of Utility
Edison International's preferred and preference stock of utility	$ 2,022	$ 1,753
Southern California Edison
Preferred and Preference Stock of Utility
Edison International's preferred and preference stock of utility	2,070	1,795
Southern California Edison | 4.08% Series
Preferred and Preference Stock of Utility
Shares Outstanding	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	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	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	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 | Preference stock
Preferred and Preference Stock of Utility
Preferred stock before issuance costs	2,070	1,795
Less issuance costs	(48)	(42)
Edison International's preferred and preference stock of utility	2,022	1,753
Southern California Edison | 4.51% Series A (variable and noncumulative)
Preferred and Preference Stock of Utility
Shares Outstanding	3,250,000
Redemption Price (in dollars per share)	$ 100
Preferred stock before issuance costs	325	325
Preference stock (as a percent)	4.51%
Southern California Edison | 6.50% Series D (cumulative)
Preferred and Preference Stock of Utility
Shares Outstanding	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	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	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 (cumulative)
Preferred and Preference Stock of Utility
Shares Outstanding	160,004
Redemption Price (in dollars per share)	$ 2,500
Preferred stock before issuance costs	400	400
Preference stock (as a percent)	5.10%
Southern California Edison | 5.75% Series H (cumulative)
Preferred and Preference Stock of Utility
Shares Outstanding	110,004
Redemption Price (in dollars per share)	$ 2,500
Preferred stock before issuance costs	$ 275	$ 0
Preference stock (as a percent)	5.75%