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OTHER FINANCIAL DATA - RECLASSIFICATION FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Interest expense $ (142) $ (139) $ (285) $ (273)
Equity earnings, net of income tax. 33 22 50 37
Equity Earnings (Losses) Recorded Before Tax 14 27 (8) 46
Revenues - energy related businesses 162 234 342 494
Total before income tax (112) 396 343 1,002
Income tax (expense) benefit 106 (98) (36) (261)
Earnings attributable to noncontrolling interest (10) (24) (21) (45)
Earnings 16 295 335 732
Amounts Reclassified From Accumulated Other Comprehensive Income [1] 6 3 5 3
San Diego Gas and Electric Company [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Interest expense (48) (52) (96) (104)
Total before income tax 135 184 337 423
Income tax (expense) benefit (48) (54) (120) (142)
Earnings attributable to noncontrolling interest 13 (4) 12 (8)
Earnings 100 126 229 273
Amounts Reclassified From Accumulated Other Comprehensive Income 0 0 0 0
Southern California Gas Company [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Interest expense (24) (19) (46) (38)
Total before income tax (29) 87 253 396
Income tax (expense) benefit 29 (16) (58) (111)
Earnings 0 71 195 285
Accumulated Net Gain Loss From Cash Flow Hedges Including Portion Attributable To Noncontrolling Interest [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Total before income tax 10 6 11 8
Income tax (expense) benefit (1) (1) (1) 0
Net of Income Tax 9 5 10 8
Accumulated Net Gain Loss From Cash Flow Hedges Including Portion Attributable To Noncontrolling Interest [Member] | Interest Rate Instruments | Reclassification Out Of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Equity Earnings (Losses) Recorded Before Tax 2 3 5 6
Accumulated Net Gain Loss From Cash Flow Hedges Including Portion Attributable To Noncontrolling Interest [Member] | Interest Rate Instruments | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | San Diego Gas and Electric Company [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Interest expense 3 3 6 6
Accumulated Net Gain Loss From Cash Flow Hedges Including Portion Attributable To Noncontrolling Interest [Member] | Interest Rate And Foreign Exchange Instruments [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Interest expense 3 3 7 9
Equity earnings, net of income tax. 5 0 6 0
Accumulated Net Gain Loss From Cash Flow Hedges Including Portion Attributable To Noncontrolling Interest [Member] | Commodity Contracts Not Subject To Rate Recovery | Reclassification Out Of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Revenues - energy related businesses     (7) (7)
Accumulated Net Gain Loss From Cash Flow Hedges Attributable To Noncontrolling Interest [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Earnings attributable to noncontrolling interest (4) (3) (7) (7)
Accumulated Net Gain Loss From Cash Flow Hedges Attributable To Noncontrolling Interest [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | San Diego Gas and Electric Company [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Earnings attributable to noncontrolling interest (3) (3) (6) (6)
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Amounts Reclassified From Accumulated Other Comprehensive Income [1] 5 2 3 1
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Earnings 5 2 3 1
Accumulated Defined Benefit Plans Adjustment Net Unamortized Gain Loss [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Reclassification From Accumulated Other Comprehensive Income, Current Period, beforeTax [2] 2 2 4 4
Current Period Tax (1) (1) (2) (2)
Amounts Reclassified From Accumulated Other Comprehensive Income $ 1 $ 1 $ 2 $ 2
[1] All amounts are net of income tax, if subject to tax, and exclude noncontrolling interests.
[2] Amounts are included in the computation of net periodic benefit cost (see "Pension and Other Postretirement Benefits" above).