Business Segments (Details 2) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Reportable Segments Information
Operating Revenue:	$ 2,983	$ 2,741	$ 5,766	$ 5,552
Net Income (Loss) attributable to Edison International:	176	344	376	580
Total Assets:	47,075		47,075		45,530
Income (loss) from discontinued operations, net of tax	(1)	1	(3)	8
Electric Utility
Reportable Segments Information
Operating Revenue:	2,446	2,247	4,678	4,406
Net Income (Loss) attributable to Edison International:	211	301	433	465
Total Assets:	37,365		37,365		35,906
Competitive power generation
Reportable Segments Information
Operating Revenue:	538	495	1,090	1,147
Net Income (Loss) attributable to Edison International:	(31)	27	(51)	104
Total Assets:	9,804		9,804		9,597
Income (loss) from discontinued operations, net of tax	(1)	1	(3)	8
Parent and other
Reportable Segments Information
Operating Revenue:	(1)	(1)	(2)	(1)
Net Income (Loss) attributable to Edison International:	(4)	16	(6)	11
Total Assets:	$ (94)		$ (94)		$ 27