Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 220	$ 441	$ 435	$ 845
Pension and postretirement benefits other than pensions:
Net loss arising during the period, net of income tax benefit of $3 for the nine months ended September 30, 2012	0	0	(3)	0
Amortization of net loss included in net income, net of income tax expense of $2 and $1 for the three months and $7 and $4 for the nine months ended September 30, 2012 and 2011, respectively	4	3	12	7
Unrealized loss on derivatives qualified as cash flow hedges:
Unrealized holding loss arising during the period, net of income tax benefit of $11 and $19 for the three months and $13 and $24 for the nine months ended September 30, 2012 and 2011, respectively	(16)	(30)	(19)	(38)
Reclassification adjustments included in net income, net of income tax expense (benefit) of $1 and none for the three months and $(12) and $(12) for the nine months ended September 30, 2012 and 2011, respectively	1	0	(19)	(17)
Other comprehensive loss	(11)	(27)	(29)	(48)
Comprehensive income	209	414	406	797
Less: Comprehensive income attributable to noncontrolling interests	30	15	78	43
Comprehensive income attributable to Edison International	$ 179	$ 399	$ 328	$ 754