Preferred and Preference Stock of Utility (Schedule of Preferred and Preference Stock) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Preferred and Preference Stock of Utility
Edison International's preferred and preference stock of utility	$ 2,193,000,000	$ 2,193,000,000
SCE | 4.08% Series
Preferred and Preference Stock of Utility
Preferred stock, par value (in dollars per share)	$ 25
Preferred Stock, dividend rate, (as a percent)	4.08%
Shares Outstanding	650,000
Redemption Price (in dollars per share)	$ 25.5
Dividends Declared per Share (in dollars per share)	$ 1.020
Preferred stock before issuance costs	$ 16,000,000	16,000,000
SCE | 4.24% Series
Preferred and Preference Stock of Utility
Preferred stock, par value (in dollars per share)	$ 25
Preferred Stock, dividend rate, (as a percent)	4.24%
Shares Outstanding	1,200,000
Redemption Price (in dollars per share)	$ 25.8
Dividends Declared per Share (in dollars per share)	$ 1.060
Preferred stock before issuance costs	$ 30,000,000	30,000,000
SCE | 4.32% Series
Preferred and Preference Stock of Utility
Preferred stock, par value (in dollars per share)	$ 25
Preferred Stock, dividend rate, (as a percent)	4.32%
Shares Outstanding	1,653,429
Redemption Price (in dollars per share)	$ 28.75
Dividends Declared per Share (in dollars per share)	$ 1.080
Preferred stock before issuance costs	$ 41,000,000	41,000,000
SCE | 4.78% Series
Preferred and Preference Stock of Utility
Preferred stock, par value (in dollars per share)	$ 25
Preferred Stock, dividend rate, (as a percent)	4.78%
Shares Outstanding	1,296,769
Redemption Price (in dollars per share)	$ 25.8
Dividends Declared per Share (in dollars per share)	$ 1.195
Preferred stock before issuance costs	33,000,000	33,000,000
SCE | Preference stock
Preferred and Preference Stock of Utility
Preferred stock before issuance costs	2,245,000,000	2,245,000,000
Less issuance costs	(52,000,000)	(52,000,000)
Edison International's preferred and preference stock of utility	$ 2,193,000,000	2,193,000,000
SCE | 6.25% Series E (cumulative)
Preferred and Preference Stock of Utility
Preferred Stock, dividend rate, (as a percent)	6.25%
Shares Outstanding	350,000
Redemption Price (in dollars per share)	$ 1,000
Dividends Declared per Share (in dollars per share)	$ 62.500
Preferred stock before issuance costs	$ 350,000,000	350,000,000
SCE | 5.10% Series G (cumulative)
Preferred and Preference Stock of Utility
Preferred Stock, dividend rate, (as a percent)	5.10%
Shares Outstanding	160,004
Redemption Price (in dollars per share)	$ 2,500.00
Dividends Declared per Share (in dollars per share)	$ 127.500
Preferred stock before issuance costs	$ 400,000,000	400,000,000
SCE | 5.75% Series H (cumulative)
Preferred and Preference Stock of Utility
Preferred Stock, dividend rate, (as a percent)	5.75%
Shares Outstanding	110,004
Redemption Price (in dollars per share)	$ 2,500.00
Dividends Declared per Share (in dollars per share)	$ 143.750
Preferred stock before issuance costs	$ 275,000,000	275,000,000
SCE | 5.375% Series J (cumulative)
Preferred and Preference Stock of Utility
Preferred Stock, dividend rate, (as a percent)	5.375%
Shares Outstanding	130,004
Redemption Price (in dollars per share)	$ 2,500.00
Dividends Declared per Share (in dollars per share)	$ 134.375
Preferred stock before issuance costs	$ 325,000,000	325,000,000
SCE | 5.45% Series K (cumulative)
Preferred and Preference Stock of Utility
Preferred Stock, dividend rate, (as a percent)	5.45%
Shares Outstanding	120,004
Redemption Price (in dollars per share)	$ 2,500
Dividends Declared per Share (in dollars per share)	$ 136.250
Preferred stock before issuance costs	$ 300,000,000	300,000,000
SCE | 5.00% Series L (cumulative)
Preferred and Preference Stock of Utility
Preferred Stock, dividend rate, (as a percent)	5.00%
Shares Outstanding	190,004
Redemption Price (in dollars per share)	$ 2,500
Dividends Declared per Share (in dollars per share)	$ 125.000
Preferred stock before issuance costs	$ 475,000,000	$ 475,000,000