FAIR VALUE MEASUREMENTS 3 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 107	$ 99
Realized and unrealized gains (losses)	6	1
Allocated transmission instruments	0	1
Settlements	(11)	(6)
Balance at end of period	102	95
Change in unrealized gains (losses) relating to instruments still held at period end	1	0
CRR Auction Rate Per MWh, Minimum	(16)sre_CRRAuctionRatePerMWHourMinimum	(6)sre_CRRAuctionRatePerMWHourMinimum
CRR Auction Rate Per MWh, Maximum	$ 8sre_CRRAuctionRatePerMWHourMaximum	$ 12sre_CRRAuctionRatePerMWHourMaximum

CRR auction rate per MWh, maximum.

No definition available.

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- Definition

CRR auction rate per MWh, minimum.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Change in unrealized gains (losses) relating to instruments still held at period end.

+ References

No definition available.

+ Details

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- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis asset allocated transmission instruments.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Details

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- Definition

Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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