Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net income	$ 21	$ 1,307	$ 945
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments – net	0	0	4
Pension and postretirement benefits other than pensions:
Net loss arising during the period, net of income tax benefit of $14, $22 and $3 for 2011, 2010 and 2009, respectively	(21)	(23)	(13)
Amortization of net loss included in net income, net of income tax expense of $5, $4 and $8 for 2011, 2010 and 2009, respectively	8	6	13
Prior service credit arising during the period, net of income tax expense of $4 for 2010	0	(6)	0
Amortization of prior service credit, net of income tax expense	0	(1)	1
Unrealized gain (loss) on derivatives qualified as cash flow hedges:
Unrealized holding gain (loss) arising during the period, net of income tax expense (benefit) of $(7), $37 and $36 for 2011, 2010 and 2009, respectively	(12)	55	43
Reclassification adjustments included in net income, net of income tax benefit of $25, $96 and $124 for 2011, 2010 and 2009, respectively	(38)	(144)	(178)
Other comprehensive loss	(63)	(113)	(130)
Comprehensive income (loss)	(42)	1,194	815
Less: Comprehensive income attributable to noncontrolling interests	58	51	96
Comprehensive income (loss) attributable to Edison International	$ (100)	$ 1,143	$ 719