The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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INVESTMENTS IN UNCONSOLIDATED ENTITIES - GUARANTEES (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2015	Dec. 31, 2014
Long-term Purchase Commitment [Line Items]
Current guarantor obligations	$ 26
Debt Service Operations [Member]
Long-term Purchase Commitment [Line Items]
Maximum exposure of guarantor obligations	183
Current guarantor obligations	6
Purchased Power Contracts [Member]
Long-term Purchase Commitment [Line Items]
Maximum exposure of guarantor obligations	370
Current guarantor obligations	$ 3
IEnova [Member] \| Sempra Mexico [Member]
Long-term Purchase Commitment [Line Items]
Ownership percentage held by noncontrolling owners	33.60%	33.60%	33.60%	18.90%
Corporate Joint Venture [Member] \| IMG [Member] \| IEnova [Member] \| Sempra Mexico [Member]
Long-term Purchase Commitment [Line Items]
Ownership percentage held by noncontrolling owners	40.00%
Maximum exposure of guarantor obligations	$ 288
TransCanada [Member] \| Corporate Joint Venture [Member] \| IMG [Member] \| IEnova [Member] \| Sempra Mexico [Member]
Long-term Purchase Commitment [Line Items]
Ownership percentage held by noncontrolling owners	60.00%