Discontinued Operations (Details) $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Aug. 31, 2014 installment	Apr. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
EME settlement payments					$ 176	$ 225
Less: Income from discontinued operations			$ 43		43	146
Income (loss) from discontinued operations, net of tax			43	$ (16)	43	146
Edison Mission Energy
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
EME settlement payments		$ 225
Number of payment installments | installment	2
First installment payment			$ 204		204
Edison Mission Energy | Scenario, Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Second installment payment							$ 214
Edison International Parent and Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Insurance recoveries, net of tax					16
Insurance recoveries					28
Tax adjustments, settlements, unusual provisions					$ 27	$ 22