ACQUISITION AND DIVESTITURE ACTIVITY - ACQUISITIONS (Details) - Sempra Renewables [Member] - Subsequent Event [Member] - Great Valley Solar [Member] $ in Millions	Jul. 10, 2017 USD ($) ppa MW
Business Acquisition [Line Items]
Cash paid \| $	$ 124
Power generating capacity \| MW	200
Number of purchase power agreements \| ppa	4
Term of power purchase agreement	18 years

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration