Debt and Credit Agreements (Long-Term Debt) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Current portion of long-term debt		$ (295)	$ (504)
Long-term debt		10,964	10,234
Edison International Parent and Other:
Debt Instrument [Line Items]
Other long-term debt		31	2
Current portion of long-term debt		(216)	(204)
Unamortized debt discount, net		(2)	(5)
Long-term debt		427	610
Edison International Parent and Other: | Debentures and notes:
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 614	817
Interest rate on debt, minimum (as a percent)		0.00%
Interest rate on debt, maximum (as a percent)		3.75%
Southern California Edison
Debt Instrument [Line Items]
Current portion of long-term debt		$ (79)	(300)
Unamortized debt discount, net		(36)	(37)
Long-term debt		10,537	9,624
Southern California Edison | Debentures and notes:
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 307	307
Interest rate on debt, minimum (as a percent)		5.06%
Interest rate on debt, maximum (as a percent)		6.65%
Southern California Edison | First and refunding mortgage bonds:
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 9,436	8,875
Interest rate on debt, minimum (as a percent)		1.125%
Interest rate on debt, maximum (as a percent)		6.05%
Southern California Edison | Pollution-control bonds:
Debt Instrument [Line Items]
Long-term Debt, Gross	[1]	$ 909	$ 779
Interest rate on debt, minimum (as a percent)		1.375%
Interest rate on debt, maximum (as a percent)		5.00%

[1] 1 Includes outstanding bonds that have not been retired and may be remarketed to investors in the future. These bonds have variable rates and are due in 2031 at December 31, 2015.