Discontinued Operations (Details) $ in Millions	1 Months Ended		3 Months Ended								12 Months Ended
	Aug. 31, 2014 installment	Apr. 30, 2014 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of tax			$ 13	$ 0	$ (2)	$ 1	$ (8)	$ 43	$ 0	$ 0	$ 12	$ 35	$ 185
Income (loss) before income taxes											1	15	(525)
Income tax benefits											(11)	(21)	(710)
Edison Mission Energy
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash portion of settlement payment		$ 225
Number of installments | installment	2
Installment one, tax attribute settlement								$ 204
Installment two, tax attribute settlement				$ 214
Edison International
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of tax											$ 12	$ 35	185
Income tax benefits													$ (710)