Debt and Credit Agreements (Details) (USD $)															0 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Southern California Edison	Dec. 31, 2013 Southern California Edison	Jun. 30, 2014 Southern California Edison First and refunding mortgage bonds	Mar. 31, 2014 Southern California Edison First and refunding mortgage bonds	Sep. 30, 2014 Edison International Parent and Other Revolving credit facility	Jul. 31, 2014 Edison International Parent and Other Revolving credit facility	Dec. 31, 2013 Edison International Parent and Other Revolving credit facility	Sep. 30, 2014 Edison International Parent and Other Non-interest Bearing Promissory Notes Due in September 2015	Sep. 30, 2014 Edison International Parent and Other Non-interest Bearing Promissory Notes Due in September 2016	Sep. 30, 2014 Commercial paper Southern California Edison Revolving credit facility	Jul. 31, 2014 Commercial paper Southern California Edison Revolving credit facility	Dec. 31, 2013 Commercial paper Southern California Edison Revolving credit facility	Sep. 30, 2014 Letters of credit Southern California Edison Revolving credit facility	Sep. 30, 2014 Letters of credit Southern California Edison Revolving credit facility
Debt Instrument [Line Items]
Issuance of debt					$ 400,000,000	$ 300,000,000				$ 204,000,000	$ 214,000,000
Outstanding borrowings												379,000,000		175,000,000
Weighted average interest rate (as a percent)							0.27%		0.55%			0.22%		0.24%
Commitment								1,250,000,000					2,750,000,000
Outstanding letters of credit																226,000,000
Letters of credit expiration period															12 months
Short-term debt	$ 1,349,000,000	$ 209,000,000	$ 679,000,000	$ 175,000,000			$ 670,000,000		$ 34,000,000
Stated interest rate on May 2014 mortgage bonds due in May 2017					1.125%