XML 63 R50.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Derivative Instruments (Summarization of Economic Hedging Activities) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Realized losses | $ (2) | $ (27)
Unrealized losses | $ (85) | $ (64)

X
- Definition Realized gains and losses on hedging activities, which are recognized as purchased-power expense. Because the entity recovers these costs from rate payers, earnings are not affected, but cash flows may be temporarily affected. + References No definition available. + Details
Name: | eix_RealizedGainsLossesOnEconomicHedgingActivities
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_UnrealizedGainLossOnDerivatives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration