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GENERAL INFORMATION AND OTHER FINANCIAL DATA - RECLASSIFICATION FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest expense | $ (260) | $ (206)
Other income, net | (82) | (152)
Equity earnings (losses) | 101 | (21)
Energy-related businesses | 383 | 346
Income from continuing operations before income taxes and equity earnings (losses) of unconsolidated entities | 501 | 593
Income tax benefit (expense) | 42 | 242
Net income | (518) | (358)
Earnings attributable to noncontrolling interest | (41) | 17
Earnings attributable to common shares | 441 | 347
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Earnings attributable to common shares | 1 | (6)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains (Losses) on Cash Flow hedges [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Income from continuing operations before income taxes and equity earnings (losses) of unconsolidated entities | 0 | (16)
Income tax benefit (expense) | 0 | (3)
Net income | 0 | 13
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains (Losses) on Cash Flow hedges [Member] | Interest rate and foreign exchange instruments [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest expense | 1 | (2)
Other income, net | (3) | (18)
Equity earnings (losses) | 1 | 4
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains (Losses) on Cash Flow hedges [Member] | Foreign exchange instruments [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Energy-related businesses | 1 | 0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains (Losses) on Cash Flow hedges Attributable to Noncontrolling Interests [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Earnings attributable to noncontrolling interest | (1) | 5
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains (Losses) on Cash Flow hedges Attributable to Parent [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Earnings attributable to common shares | (1) | (8)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gain (Loss) on Pension and Other Postretirement Benefits [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Other income, net | 2 | 3
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Other income, net | 1 | 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 from continuing operations before income taxes and equity earnings (losses) of unconsolidated entities | 3 | 3
Income tax benefit (expense) | (1) | (1)
Net income | 2 | 2
San Diego Gas and Electric Company [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest expense | (103) | (52)
Other income, net | (22) | (28)
Income from continuing operations before income taxes and equity earnings (losses) of unconsolidated entities | 182 | 225
Income tax benefit (expense) | 5 | 56
Net income | (177) | (169)
Earnings attributable to noncontrolling interest | (1) | 1
Earnings attributable to common shares | 176 | 170
San Diego Gas and Electric Company [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Earnings attributable to common shares | 0 | 0
San Diego Gas and Electric Company [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains (Losses) on Cash Flow hedges [Member] | Interest rate instruments [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest expense | 1 | 3
San Diego Gas and Electric Company [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains (Losses) on Cash Flow hedges Attributable to Noncontrolling Interests [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Earnings attributable to noncontrolling interest | $ (1) | $ (3)

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