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SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 2,481 $ 2,815 $ 7,530 $ 8,288  
Segment reporting information, Percentage of Total Consolidated Revenues 100.00% 100.00% 100.00% 100.00%  
Segment reporting information, Interest Expense $ 143 $ 144 $ 416 $ 418  
Segment reporting information, Interest Income 6 6 23 15  
Segment reporting information, Depreciation and Amortization $ 315 $ 292 $ 925 $ 866  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 100.00% 100.00% 100.00% 100.00%  
Segment reporting information, Income Tax Expense (Benefit) $ 15 $ 71 $ 276 $ 291  
Equity Earnings (Losses) Recorded Before Tax 33 22 79 62  
Segment reporting information, Equity Earnings (Losses) Recorded Net of Tax 27 7 64 22  
Segment reporting information, Earnings (Losses) $ 248 $ 348 $ 980 $ 864  
Segment reporting information, Percentage of Consolidated Earnings (Losses) 100.00% 100.00% 100.00% 100.00%  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 2,227 $ 2,320  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     100.00% 100.00%  
Segment reporting information, Assets $ 40,566   $ 40,566   $ 39,732 [1]
Segment reporting information, Percentage of Consolidated Assets 100.00%   100.00%   100.00%
Segment Reporting Information Investments In Equity Method Investees $ 2,845   $ 2,845   $ 2,848
S D G E Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 1,230 $ 1,233 $ 3,168 $ 3,283  
Segment reporting information, Percentage of Total Consolidated Revenues 50.00% 44.00% 42.00% 40.00%  
Segment reporting information, Interest Expense $ 51 $ 51 $ 155 $ 152  
Segment reporting information, Depreciation and Amortization $ 152 $ 134 $ 446 $ 395  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 48.00% 46.00% 48.00% 46.00%  
Segment reporting information, Income Tax Expense (Benefit) $ 75 $ 65 $ 217 $ 217  
Segment reporting information, Earnings (Losses) $ 170 $ 157 $ 443 $ 379  
Segment reporting information, Percentage of Consolidated Earnings (Losses) 69.00% 45.00% 45.00% 44.00%  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 835 $ 790  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     38.00% 34.00%  
Segment reporting information, Assets $ 16,692   $ 16,692   $ 16,296
Segment reporting information, Percentage of Consolidated Assets 41.00%   41.00%   41.00%
Segment Reporting Information, Intersegment Revenues $ 2 $ 2 $ 7 $ 7  
So Cal Gas Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 620 $ 855 $ 2,448 $ 2,857  
Segment reporting information, Percentage of Total Consolidated Revenues 25.00% 30.00% 33.00% 35.00%  
Segment reporting information, Interest Expense $ 23 $ 17 $ 61 $ 50  
Segment reporting information, Interest Income 0 0 3 0  
Segment reporting information, Depreciation and Amortization $ 116 $ 109 $ 342 $ 321  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 37.00% 37.00% 37.00% 37.00%  
Segment reporting information, Income Tax Expense (Benefit) $ (20) $ 44 $ 91 $ 110  
Segment reporting information, Earnings (Losses) [2] $ (8) $ 98 $ 276 $ 256  
Segment reporting information, Percentage of Consolidated Earnings (Losses) [2] (3.00%) 28.00% 28.00% 30.00%  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 946 $ 764  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     42.00% 33.00%  
Segment reporting information, Assets $ 11,355   $ 11,355   $ 10,461
Segment reporting information, Percentage of Consolidated Assets 28.00%   28.00%   26.00%
Segment Reporting Information, Intersegment Revenues $ 19 $ 17 $ 55 $ 51  
Sempra South American Utilities Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 373 $ 379 $ 1,151 $ 1,147  
Segment reporting information, Percentage of Total Consolidated Revenues 15.00% 14.00% 15.00% 14.00%  
Segment reporting information, Interest Expense $ 9 $ 7 $ 22 $ 24  
Segment reporting information, Interest Income 5 4 14 10  
Segment reporting information, Depreciation and Amortization $ 12 $ 14 $ 37 $ 41  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 4.00% 5.00% 4.00% 5.00%  
Segment reporting information, Income Tax Expense (Benefit) $ 16 $ 26 $ 50 $ 59  
Segment reporting information, Equity Earnings (Losses) Recorded Net of Tax (3) (2) (4) (4)  
Segment reporting information, Earnings (Losses) $ 43 $ 32 $ 129 $ 109  
Segment reporting information, Percentage of Consolidated Earnings (Losses) 17.00% 9.00% 13.00% 13.00%  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 105 $ 126  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     5.00% 5.00%  
Segment reporting information, Assets $ 3,265   $ 3,265   $ 3,379
Segment reporting information, Percentage of Consolidated Assets 8.00%   8.00%   9.00%
Segment Reporting Information Investments In Equity Method Investees $ (11)   $ (11)   $ (8)
Sempra Mexico Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 193 $ 234 $ 508 $ 621  
Segment reporting information, Percentage of Total Consolidated Revenues 8.00% 8.00% 7.00% 7.00%  
Segment reporting information, Interest Expense $ 7 $ 5 $ 18 $ 13  
Segment reporting information, Interest Income 1 1 5 2  
Segment reporting information, Depreciation and Amortization $ 18 $ 16 $ 52 $ 47  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 6.00% 6.00% 6.00% 5.00%  
Segment reporting information, Income Tax Expense (Benefit) $ (6) $ 13 $ 7 $ 37  
Segment reporting information, Equity Earnings (Losses) Recorded Net of Tax 30 9 68 26  
Segment reporting information, Earnings (Losses) $ 63 $ 63 $ 160 $ 139  
Segment reporting information, Percentage of Consolidated Earnings (Losses) 25.00% 18.00% 16.00% 16.00%  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 185 $ 262  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     8.00% 11.00%  
Segment reporting information, Assets $ 3,713   $ 3,713   $ 3,488
Segment reporting information, Percentage of Consolidated Assets 9.00%   9.00%   9.00%
Segment Reporting Information Investments In Equity Method Investees $ 491   $ 491   $ 434
Segment Reporting Information, Intersegment Revenues 24 $ 23 73 $ 68  
Sempra Renewables Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 12 $ 10 $ 30 $ 25  
Segment reporting information, Percentage of Total Consolidated Revenues 0.00% 0.00% 0.00% 0.00%  
Segment reporting information, Interest Expense $ 1 $ 2 $ 3 $ 3  
Segment reporting information, Interest Income 2 0 3 0  
Segment reporting information, Depreciation and Amortization $ 2 $ 1 $ 5 $ 4  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 0.00% 0.00% 0.00% 0.00%  
Segment reporting information, Income Tax Expense (Benefit) $ (9) $ (16) $ (37) $ (35)  
Equity Earnings (Losses) Recorded Before Tax 8 7 20 18  
Segment reporting information, Earnings (Losses) $ 15 $ 17 $ 47 $ 63  
Segment reporting information, Percentage of Consolidated Earnings (Losses) 6.00% 5.00% 5.00% 7.00%  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 47 $ 174  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     2.00% 8.00%  
Segment reporting information, Assets $ 1,351   $ 1,351   $ 1,338
Segment reporting information, Percentage of Consolidated Assets 3.00%   3.00%   3.00%
Segment Reporting Information Investments In Equity Method Investees $ 843   $ 843   $ 911
Sempra Natural Gas Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 160 $ 252 $ 512 $ 748  
Segment reporting information, Percentage of Total Consolidated Revenues 6.00% 9.00% 7.00% 9.00%  
Segment reporting information, Interest Expense $ 13 $ 25 $ 57 $ 90  
Segment reporting information, Interest Income 16 24 60 87  
Segment reporting information, Depreciation and Amortization $ 12 $ 17 $ 36 $ 50  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 4.00% 6.00% 4.00% 6.00%  
Segment reporting information, Income Tax Expense (Benefit) $ 0 $ (31) $ 29 $ (22)  
Equity Earnings (Losses) Recorded Before Tax 25 15 59 44  
Segment reporting information, Earnings (Losses) $ 1 $ 26 $ 43 $ 39  
Segment reporting information, Percentage of Consolidated Earnings (Losses) 0.00% 8.00% 5.00% 4.00%  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 61 $ 192  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     3.00% 8.00%  
Segment reporting information, Assets $ 5,552   $ 5,552   $ 6,436
Segment reporting information, Percentage of Consolidated Assets 14.00%   14.00%   16.00%
Segment Reporting Information Investments In Equity Method Investees $ 1,435   $ 1,435   $ 1,347
Segment Reporting Information, Intersegment Revenues 62 $ 107 151 $ 266  
Adjustments and Eliminations [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 0 $ 1 $ (1) $ (1)  
Segment reporting information, Percentage of Total Consolidated Revenues 0.00% 0.00% 0.00% 0.00%  
Intercompany Eliminations Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Interest Expense $ (26) $ (26) $ (93) $ (92)  
Segment reporting information, Interest Income (18) (22) (62) (84)  
Intersegment Revenues Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue [3] $ (107) $ (149) $ (286) $ (392)  
Segment reporting information, Percentage of Total Consolidated Revenues [3] (4.00%) (5.00%) (4.00%) (5.00%)  
Intersegment Receivables Segment [Member]          
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Assets $ (2,480)   $ (2,480)   $ (2,561)
Segment reporting information, Percentage of Consolidated Assets (6.00%)   (6.00%)   (6.00%)
All Other Segments [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Interest Expense $ 65 $ 63 $ 193 $ 178  
Segment reporting information, Interest Income 0 (1) 0 0  
Segment reporting information, Depreciation and Amortization $ 3 $ 1 $ 7 $ 8  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 1.00% 0.00% 1.00% 1.00%  
Segment reporting information, Income Tax Expense (Benefit) $ (41) $ (30) $ (81) $ (75)  
Segment reporting information, Earnings (Losses) $ (36) $ (45) $ (118) $ (121)  
Segment reporting information, Percentage of Consolidated Earnings (Losses) (14.00%) (13.00%) (12.00%) (14.00%)  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 48 $ 12  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     2.00% 1.00%  
Segment reporting information, Assets $ 1,118   $ 1,118   $ 895
Segment reporting information, Percentage of Consolidated Assets 3.00%   3.00%   2.00%
Segment Reporting Information Investments In Equity Method Investees $ 87   $ 87   $ 164
[1] Derived from audited financial statements.
[2] After preferred dividends.
[3] Revenues for reportable segments include intersegment revenues of $2 million, $19 million, $24 million and $62 million for the three months ended September 30, 2015; $7 million, $55 million, $73 million and $151 million for the nine months ended September 30, 2015; $2 million, $17 million, $23 million and $107 million for the three months ended September 30, 2014; and $7 million, $51 million, $68 million and $266 million for the nine months ended September 30, 2014 for SDG&E, SoCalGas, Sempra Mexico and Sempra Natural Gas, respectively.