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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - RECLASSIFICATION FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | $ (925) | $ (659) | [1] | $ (553) | [1]
Other income, net |  |  |  |  |  |  |  |  |  | 72 | 233 | [1] | 138 | [1]
Gain on sale of assets | $ 513 |  |  |  |  |  |  |  |  | 524 | 3 | [1] | 134 | [1]
Equity earnings |  |  |  |  |  |  |  |  |  | 176 | 76 | [1] | 84 | [1]
Remeasurement of equity method investment |  |  |  |  |  |  |  |  |  | 0 | 0 | [1] | 617 | [1]
Energy-related businesses |  |  |  |  |  |  |  |  |  | 1,641 | 1,431 | [1] | 922 | [1]
Income before income taxes |  |  |  |  |  |  |  |  |  | 1,046 | 1,551 | [1] | 1,824 | [1]
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  | (96) | (1,276) | [1] | (389) | [1]
(Earnings) losses attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  | (76) | (94) | [1] | (148) | [1]
Earnings attributable to common shares |  | $ 864 | $ 274 | $ (561) | $ 347 | $ (501) | $ 57 | $ 259 | $ 441 |  |  |  |  |
Reclassification from AOCI, Net of taxes |  |  |  |  |  |  |  |  |  | 21 | 19 |  | 18 |
San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | (221) | (203) | [1] | (195) | [1]
Other income, net |  |  |  |  |  |  |  |  |  | 56 | 70 | [1] | 64 | [1]
Income before income taxes |  |  |  |  |  |  |  |  |  | 849 | 576 | [1] | 845 | [1]
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  | (173) | (155) | [1] | (280) | [1]
(Earnings) losses attributable to noncontrolling interest |  | $ 3 | $ (11) | $ 0 | $ 1 | $ 1 | $ (9) | $ (4) | $ (2) | (7) | (14) | [1] | 5 | [1]
Reclassification from AOCI, Net of taxes |  |  |  |  |  |  |  |  |  | 4 | 1 |  | 1 |
Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | (115) | (102) | [1] | (97) | [1]
Other income, net |  |  |  |  |  |  |  |  |  | 15 | 31 | [1] | 38 | [1]
Income before income taxes |  |  |  |  |  |  |  |  |  | 493 | 557 | [1] | 493 | [1]
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  | (92) | (160) | [1] | (143) | [1]
Reclassification from AOCI, Net of taxes |  |  |  |  |  |  |  |  |  | 2 | 1 |  | 1 |
Financial instruments attributable to parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from AOCI, Net of taxes |  |  |  |  |  |  |  |  |  | 3 | 7 |  | 19 |
Financial instruments attributable to parent [Member] | Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from AOCI, Net of taxes |  |  |  |  |  |  |  |  |  | 1 | 0 |  | 1 |
Pension and other postretirement benefits [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from AOCI, Net of taxes |  |  |  |  |  |  |  |  |  | 18 | 12 |  | 6 |
Pension and other postretirement benefits [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from AOCI, Net of taxes |  |  |  |  |  |  |  |  |  | 4 | 1 |  | 1 |
Pension and other postretirement benefits [Member] | Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from AOCI, Net of taxes |  |  |  |  |  |  |  |  |  | 1 | 1 |  | 0 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Financial instruments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  | 13 | 23 |  | 33 |
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  | (4) | (6) |  | (6) |
Net of income tax |  |  |  |  |  |  |  |  |  | 9 | 17 |  | 27 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Financial instruments [Member] | Interest rate and foreign exchange instruments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | 0 | (4) |  | 17 |
Other income, net |  |  |  |  |  |  |  |  |  | (2) | 0 |  | 0 |
Equity earnings |  |  |  |  |  |  |  |  |  | 7 | 20 |  | 15 |
Remeasurement of equity method investment |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 7 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Financial instruments [Member] | Interest rate instruments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  |  |  |  |  |  | 9 | 0 |  | 0 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Financial instruments [Member] | Interest rate instruments [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | 7 | 13 |  | 12 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Financial instruments [Member] | Foreign exchange instruments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy-related businesses |  |  |  |  |  |  |  |  |  | (1) | (2) |  | 0 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Financial instruments [Member] | Commodity Contracts Not Subject To Rate Recovery [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy-related businesses |  |  |  |  |  |  |  |  |  | 0 | 9 |  | (6) |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Financial instruments attributable to Noncontrolling interests [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Earnings) losses attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  | (6) | (10) |  | (15) |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Financial instruments attributable to Noncontrolling interests [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Earnings) losses attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  | (7) | (13) |  | (12) |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Financial instruments attributable to parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings attributable to common shares |  |  |  |  |  |  |  |  |  | 3 | 7 |  | 12 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Financial instruments attributable to parent [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings attributable to common shares |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Financial instruments attributable to parent [Member] | Interest rate instruments [Member] | Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | 1 | 0 |  | 1 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of actuarial loss [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  |  | 12 | 10 |  | 10 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of actuarial loss [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  |  | 1 | 1 |  | 1 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of prior service cost [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  |  | 2 | 1 |  | 1 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of prior service cost [Member] | Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  |  | 1 | 1 |  | 0 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Settlements Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  |  | 12 | 8 |  | 0 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Settlements Attributable to Parent [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  |  | 4 | 0 |  | 0 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension and other postretirement benefits [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  | 26 | 19 |  | 11 |
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  | (8) | (7) |  | (5) |
Net of income tax |  |  |  |  |  |  |  |  |  | 18 | 12 |  | 6 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension and other postretirement benefits [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  | 5 | 1 |  | 1 |
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  | (1) | 0 |  | 0 |
Net of income tax |  |  |  |  |  |  |  |  |  | $ 4 | $ 1 |  | $ 1 |
[1] | As adjusted for the retrospective adoption of ASU 2017-07, which we discuss in Note 2, and a reclassification to conform to current year presentation, which we discuss in Note 1.

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