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SEGMENT INFORMATION (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
segment
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments | segment     6    
Segment Reporting Information, Profit (Loss) [Abstract]          
REVENUES $ 2,535 $ 2,481 $ 7,313 $ 7,530  
Percentage of consolidated revenues 100.00% 100.00% 100.00% 100.00%  
INTEREST EXPENSE $ 136 $ 143 $ 421 $ 416  
INTEREST INCOME 7 6 19 23  
DEPRECIATION AND AMORTIZATION $ 328 $ 315 $ 970 $ 925  
Percentage of consolidated depreciation and amortization 100.00% 100.00% 100.00% 100.00%  
INCOME TAX EXPENSE (BENEFIT) $ 282 $ 15 $ 284 $ 276  
Equity earnings, before income tax 12 33 4 79  
Equity earnings (losses) net of tax 19 27 69 64  
EARNINGS (LOSSES) 622 248 991 980  
Segment Reporting Information, Additional Information [Abstract]          
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT     $ 3,087 $ 2,227  
Percentage of consolidated expenditures for property, plant & equipment     100.00% 100.00%  
ASSETS $ 45,526   $ 45,526   $ 41,150 [1]
Percentage of consolidated assets 100.00%   100.00%   100.00%
EQUITY METHOD AND OTHER INVESTMENTS $ 1,840   $ 1,840   $ 2,905 [1]
Operating Segments [Member] | SDG&E [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
REVENUES $ 1,209 $ 1,230 $ 3,192 $ 3,168  
Percentage of consolidated revenues 48.00% 50.00% 44.00% 42.00%  
INTEREST EXPENSE $ 49 $ 51 $ 145 $ 155  
DEPRECIATION AND AMORTIZATION $ 161 $ 152 $ 478 $ 446  
Percentage of consolidated depreciation and amortization 49.00% 48.00% 49.00% 48.00%  
INCOME TAX EXPENSE (BENEFIT) $ 91 $ 75 $ 204 $ 217  
EARNINGS (LOSSES) 183 170 419 443  
Segment Reporting Information, Additional Information [Abstract]          
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT     $ 959 $ 835  
Percentage of consolidated expenditures for property, plant & equipment     31.00% 38.00%  
ASSETS $ 17,446   $ 17,446   $ 16,515
Percentage of consolidated assets 38.00%   38.00%   40.00%
Operating Segments [Member] | SoCalGas [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
REVENUES $ 686 $ 620 $ 2,336 $ 2,448  
Percentage of consolidated revenues 27.00% 25.00% 32.00% 33.00%  
INTEREST EXPENSE $ 25 $ 23 $ 71 $ 61  
INTEREST INCOME 0 0 0 3  
DEPRECIATION AND AMORTIZATION $ 121 $ 116 $ 355 $ 342  
Percentage of consolidated depreciation and amortization 37.00% 37.00% 37.00% 37.00%  
INCOME TAX EXPENSE (BENEFIT) $ 21 $ (20) $ 75 $ 91  
EARNINGS (LOSSES) 0 (8) 198 276  
Segment Reporting Information, Additional Information [Abstract]          
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT     $ 949 $ 946  
Percentage of consolidated expenditures for property, plant & equipment     31.00% 42.00%  
ASSETS $ 13,148   $ 13,148   $ 12,104
Percentage of consolidated assets 29.00%   29.00%   29.00%
Operating Segments [Member] | Sempra South American Utilities [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
REVENUES $ 385 $ 373 $ 1,170 $ 1,151  
Percentage of consolidated revenues 15.00% 15.00% 16.00% 15.00%  
INTEREST EXPENSE $ 9 $ 9 $ 29 $ 22  
INTEREST INCOME 5 5 15 14  
DEPRECIATION AND AMORTIZATION $ 14 $ 12 $ 41 $ 37  
Percentage of consolidated depreciation and amortization 4.00% 4.00% 4.00% 4.00%  
INCOME TAX EXPENSE (BENEFIT) $ 17 $ 16 $ 46 $ 50  
Equity earnings (losses) net of tax 1 (3) 3 (4)  
EARNINGS (LOSSES) 46 43 127 129  
Segment Reporting Information, Additional Information [Abstract]          
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT     $ 133 $ 105  
Percentage of consolidated expenditures for property, plant & equipment     4.00% 5.00%  
ASSETS $ 3,488   $ 3,488   $ 3,235
Percentage of consolidated assets 8.00%   8.00%   8.00%
EQUITY METHOD AND OTHER INVESTMENTS $ (1)   $ (1)   $ (4)
Operating Segments [Member] | Sempra Mexico [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
REVENUES $ 196 $ 193 $ 481 $ 508  
Percentage of consolidated revenues 8.00% 8.00% 7.00% 7.00%  
INTEREST EXPENSE $ 5 $ 7 $ 13 $ 18  
INTEREST INCOME 2 1 5 5  
DEPRECIATION AND AMORTIZATION $ 15 $ 18 $ 47 $ 52  
Percentage of consolidated depreciation and amortization 5.00% 6.00% 5.00% 6.00%  
INCOME TAX EXPENSE (BENEFIT) $ 142 $ (6) $ 170 $ 7  
Equity earnings (losses) net of tax 18 30 66 68  
EARNINGS (LOSSES) 332 63 407 160  
Segment Reporting Information, Additional Information [Abstract]          
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT     $ 232 $ 185  
Percentage of consolidated expenditures for property, plant & equipment     8.00% 8.00%  
ASSETS $ 6,359   $ 6,359   $ 3,783
Percentage of consolidated assets 14.00%   14.00%   9.00%
EQUITY METHOD AND OTHER INVESTMENTS $ 108   $ 108   $ 519
Operating Segments [Member] | Sempra Renewables [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
REVENUES $ 12 $ 12 $ 25 $ 30  
Percentage of consolidated revenues 1.00% 0.00% 0.00% 0.00%  
INTEREST EXPENSE $ 0 $ 1 $ 0 $ 3  
INTEREST INCOME 1 2 2 3  
DEPRECIATION AND AMORTIZATION $ 1 $ 2 $ 4 $ 5  
Percentage of consolidated depreciation and amortization 0.00% 0.00% 0.00% 0.00%  
INCOME TAX EXPENSE (BENEFIT) $ (7) $ (9) $ (29) $ (37)  
Equity earnings, before income tax 12 8 30 20  
EARNINGS (LOSSES) 17 15 43 47  
Segment Reporting Information, Additional Information [Abstract]          
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT     $ 700 $ 47  
Percentage of consolidated expenditures for property, plant & equipment     23.00% 2.00%  
ASSETS $ 2,112   $ 2,112   $ 1,441
Percentage of consolidated assets 5.00%   5.00%   4.00%
EQUITY METHOD AND OTHER INVESTMENTS $ 819   $ 819   $ 855
Operating Segments [Member] | Sempra Natural Gas [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
REVENUES $ 164 $ 160 $ 384 $ 512  
Percentage of consolidated revenues 6.00% 6.00% 5.00% 7.00%  
INTEREST EXPENSE $ 11 $ 13 $ 33 $ 57  
INTEREST INCOME 19 16 52 60  
DEPRECIATION AND AMORTIZATION $ 12 $ 12 $ 37 $ 36  
Percentage of consolidated depreciation and amortization 4.00% 4.00% 4.00% 4.00%  
INCOME TAX EXPENSE (BENEFIT) $ 51 $ 0 $ (77) $ 29  
Equity earnings, before income tax 0 25 (26) 59  
EARNINGS (LOSSES) 77 1 (104) 43  
Segment Reporting Information, Additional Information [Abstract]          
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT     $ 100 $ 61  
Percentage of consolidated expenditures for property, plant & equipment     3.00% 3.00%  
ASSETS $ 5,377   $ 5,377   $ 5,566
Percentage of consolidated assets 12.00%   12.00%   13.00%
EQUITY METHOD AND OTHER INVESTMENTS $ 838   $ 838   $ 1,460
Adjustments and eliminations [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
REVENUES $ (1) $ 0 $ (1) $ (1)  
Percentage of consolidated revenues 0.00% 0.00% 0.00% 0.00%  
All other [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
INTEREST EXPENSE $ 68 $ 65 $ 214 $ 193  
INTEREST INCOME 1 0 1 0  
DEPRECIATION AND AMORTIZATION $ 4 $ 3 $ 8 $ 7  
Percentage of consolidated depreciation and amortization 1.00% 1.00% 1.00% 1.00%  
INCOME TAX EXPENSE (BENEFIT) $ (33) $ (41) $ (105) $ (81)  
EARNINGS (LOSSES) (33) (36) (99) (118)  
Segment Reporting Information, Additional Information [Abstract]          
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT     $ 14 $ 48  
Percentage of consolidated expenditures for property, plant & equipment     0.00% 2.00%  
ASSETS $ 640   $ 640   $ 734
Percentage of consolidated assets 1.00%   1.00%   2.00%
EQUITY METHOD AND OTHER INVESTMENTS $ 76   $ 76   $ 75
Intersegment eliminations [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
REVENUES $ (116) $ (107) $ (274) $ (286)  
Percentage of consolidated revenues (5.00%) (4.00%) (4.00%) (4.00%)  
INTEREST EXPENSE $ (31) $ (26) $ (84) $ (93)  
INTEREST INCOME (21) (18) (56) (62)  
Segment Reporting Information, Additional Information [Abstract]          
ASSETS $ (3,044)   $ (3,044)   $ (2,228)
Percentage of consolidated assets (7.00%)   (7.00%)   (5.00%)
Intersegment eliminations [Member] | SDG&E [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
REVENUES $ 2 2 $ 5 7  
Intersegment eliminations [Member] | SoCalGas [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
REVENUES 21 19 56 55  
Intersegment eliminations [Member] | Sempra Mexico [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
REVENUES 26 24 80 73  
Intersegment eliminations [Member] | Sempra Natural Gas [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
REVENUES $ 67 $ 62 $ 133 $ 151  
[1] Derived from audited financial statements.