v3.6.0.2

INCOME TAXES - CHANGES IN UNRECOGNIZED TAX BENEFITS (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Possible change in unrecognized tax benefits in next 12 months | $ (38) | $ (34) | $ (61)
Expiration of statutes of limitations on tax assessments [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Possible change in unrecognized tax benefits in next 12 months | (2) | (2) | 0
Potential resolution of audit issues with various U.S. federal, state, and local non-U.S. taxing authorities [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Possible change in unrecognized tax benefits in next 12 months | (36) | (32) | (61)
San Diego Gas and Electric Company [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Possible change in unrecognized tax benefits in next 12 months | (11) | (9) | (9)
San Diego Gas and Electric Company [Member] | Expiration of statutes of limitations on tax assessments [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Possible change in unrecognized tax benefits in next 12 months | (1) | (1) | 0
San Diego Gas and Electric Company [Member] | Potential resolution of audit issues with various U.S. federal, state, and local non-U.S. taxing authorities [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Possible change in unrecognized tax benefits in next 12 months | (10) | (8) | (9)
Southern California Gas Company [Member] | Potential resolution of audit issues with various U.S. federal, state, and local non-U.S. taxing authorities [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Possible change in unrecognized tax benefits in next 12 months | $ (25) | $ (22) | $ (15)

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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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