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SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 2,367 $ 2,678 $ 5,049 $ 5,473  
Segment reporting information, Percentage of Total Consolidated Revenues 100.00% 100.00% 100.00% 100.00%  
Segment reporting information, Interest Expense $ 139 $ 138 $ 273 $ 274  
Segment reporting information, Interest Income 10 5 17 9  
Segment reporting information, Depreciation and Amortization $ 307 $ 288 $ 610 $ 574  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 100.00% 100.00% 100.00% 100.00%  
Segment reporting information, Income Tax Expense (Benefit) $ 98 $ 93 $ 261 $ 220  
Equity Earnings (Losses) Recorded Before Tax 27 23 46 40  
Segment reporting information, Equity Earnings (Losses) Recorded Net of Tax 22 9 37 15  
Segment reporting information, Earnings (Losses) $ 295 $ 269 $ 732 $ 516  
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     $ 1,466 $ 1,513  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     100.00% 100.00%  
Segment reporting information, Assets $ 40,006   $ 40,006   $ 39,732 [1]
Segment reporting information, Percentage of Consolidated Assets 100.00%   100.00%   100.00%
Segment Reporting Information Investments In Equity Method Investees $ 2,929   $ 2,929   $ 2,848
S D G E Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 972 $ 1,063 $ 1,938 $ 2,050  
Segment reporting information, Percentage of Total Consolidated Revenues 41.00% 40.00% 38.00% 37.00%  
Segment reporting information, Interest Expense $ 52 $ 51 $ 104 $ 101  
Segment reporting information, Depreciation and Amortization $ 149 $ 131 $ 294 $ 261  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 48.00% 45.00% 48.00% 45.00%  
Segment reporting information, Income Tax Expense (Benefit) $ 54 $ 69 $ 142 $ 152  
Segment reporting information, Earnings (Losses) $ 126 $ 123 $ 273 $ 222  
Segment reporting information, Percentage of Consolidated Earnings (Losses) 43.00% 46.00% 37.00% 43.00%  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 600 $ 543  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     41.00% 36.00%  
Segment reporting information, Assets $ 16,633   $ 16,633   $ 16,296
Segment reporting information, Percentage of Consolidated Assets 42.00%   42.00%   41.00%
Segment Reporting Information, Intersegment Revenues $ 3 $ 2 $ 5 $ 5  
So Cal Gas Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 780 $ 917 $ 1,828 $ 2,002  
Segment reporting information, Percentage of Total Consolidated Revenues 33.00% 34.00% 36.00% 37.00%  
Segment reporting information, Interest Expense $ 19 $ 16 $ 38 $ 33  
Segment reporting information, Interest Income 3 0 3 0  
Segment reporting information, Depreciation and Amortization $ 113 $ 107 $ 226 $ 212  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 37.00% 37.00% 37.00% 37.00%  
Segment reporting information, Income Tax Expense (Benefit) $ 16 $ 28 $ 111 $ 66  
Segment reporting information, Earnings (Losses) [2] $ 70 $ 80 $ 284 $ 158  
Segment reporting information, Percentage of Consolidated Earnings (Losses) [2] 24.00% 30.00% 39.00% 31.00%  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 603 $ 500  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     41.00% 33.00%  
Segment reporting information, Assets $ 11,209   $ 11,209   $ 10,461
Segment reporting information, Percentage of Consolidated Assets 28.00%   28.00%   26.00%
Segment Reporting Information, Intersegment Revenues $ 17 $ 16 $ 36 $ 34  
Sempra South American Utilities Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 389 $ 390 $ 778 $ 768  
Segment reporting information, Percentage of Total Consolidated Revenues 16.00% 15.00% 15.00% 14.00%  
Segment reporting information, Interest Expense $ 8 $ 9 $ 13 $ 17  
Segment reporting information, Interest Income 5 3 9 6  
Segment reporting information, Depreciation and Amortization $ 12 $ 13 $ 25 $ 27  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 4.00% 5.00% 4.00% 5.00%  
Segment reporting information, Income Tax Expense (Benefit) $ 18 $ 18 $ 34 $ 33  
Segment reporting information, Equity Earnings (Losses) Recorded Net of Tax 0 0 (1) (2)  
Segment reporting information, Earnings (Losses) $ 45 $ 42 $ 86 $ 77  
Segment reporting information, Percentage of Consolidated Earnings (Losses) 15.00% 15.00% 12.00% 15.00%  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 66 $ 89  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     5.00% 6.00%  
Segment reporting information, Assets $ 3,312   $ 3,312   $ 3,379
Segment reporting information, Percentage of Consolidated Assets 8.00%   8.00%   9.00%
Segment Reporting Information Investments In Equity Method Investees $ (9)   $ (9)   $ (8)
Sempra Mexico Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 152 $ 186 $ 315 $ 387  
Segment reporting information, Percentage of Total Consolidated Revenues 6.00% 7.00% 6.00% 7.00%  
Segment reporting information, Interest Expense $ 6 $ 4 $ 11 $ 8  
Segment reporting information, Interest Income 2 1 4 1  
Segment reporting information, Depreciation and Amortization $ 17 $ 15 $ 34 $ 31  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 6.00% 5.00% 6.00% 5.00%  
Segment reporting information, Income Tax Expense (Benefit) $ 5 $ 12 $ 13 $ 24  
Segment reporting information, Equity Earnings (Losses) Recorded Net of Tax 22 9 38 17  
Segment reporting information, Earnings (Losses) $ 50 $ 34 $ 97 $ 76  
Segment reporting information, Percentage of Consolidated Earnings (Losses) 17.00% 13.00% 13.00% 15.00%  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 120 $ 189  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     8.00% 13.00%  
Segment reporting information, Assets $ 3,568   $ 3,568   $ 3,488
Segment reporting information, Percentage of Consolidated Assets 9.00%   9.00%   9.00%
Segment Reporting Information Investments In Equity Method Investees $ 474   $ 474   $ 434
Segment Reporting Information, Intersegment Revenues 24 $ 23 49 $ 45  
Sempra Renewables Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 10 $ 9 $ 18 $ 15  
Segment reporting information, Percentage of Total Consolidated Revenues 1.00% 0.00% 1.00% 0.00%  
Segment reporting information, Interest Expense $ 1 $ 1 $ 2 $ 1  
Segment reporting information, Interest Income 1 0 1 0  
Segment reporting information, Depreciation and Amortization $ 1 $ 2 $ 3 $ 3  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 0.00% 1.00% 0.00% 1.00%  
Segment reporting information, Income Tax Expense (Benefit) $ (11) $ (13) $ (28) $ (19)  
Equity Earnings (Losses) Recorded Before Tax 10 9 12 11  
Segment reporting information, Earnings (Losses) $ 19 $ 18 $ 32 $ 46  
Segment reporting information, Percentage of Consolidated Earnings (Losses) 6.00% 7.00% 4.00% 9.00%  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 22 $ 122  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     1.00% 8.00%  
Segment reporting information, Assets $ 1,312   $ 1,312   $ 1,338
Segment reporting information, Percentage of Consolidated Assets 3.00%   3.00%   3.00%
Segment Reporting Information Investments In Equity Method Investees $ 868   $ 868   $ 911
Sempra Natural Gas Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 155 $ 236 $ 352 $ 496  
Segment reporting information, Percentage of Total Consolidated Revenues 7.00% 9.00% 7.00% 9.00%  
Segment reporting information, Interest Expense $ 23 $ 33 $ 44 $ 65  
Segment reporting information, Interest Income 25 32 44 63  
Segment reporting information, Depreciation and Amortization $ 12 $ 16 $ 24 $ 33  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 4.00% 6.00% 4.00% 6.00%  
Segment reporting information, Income Tax Expense (Benefit) $ 27 $ 3 $ 29 $ 9  
Equity Earnings (Losses) Recorded Before Tax 17 14 34 29  
Segment reporting information, Earnings (Losses) $ 40 $ 4 $ 42 $ 13  
Segment reporting information, Percentage of Consolidated Earnings (Losses) 14.00% 1.00% 6.00% 2.00%  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 28 $ 67  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     2.00% 4.00%  
Segment reporting information, Assets $ 5,535   $ 5,535   $ 6,436
Segment reporting information, Percentage of Consolidated Assets 14.00%   14.00%   16.00%
Segment Reporting Information Investments In Equity Method Investees $ 1,510   $ 1,510   $ 1,347
Segment Reporting Information, Intersegment Revenues 46 $ 80 89 $ 159  
Adjustments and Eliminations [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ (1) $ (2) $ (1) $ (2)  
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 $ (35) $ (33) $ (67) $ (66)  
Segment reporting information, Interest Income (26) (32) (44) (62)  
Intersegment Revenues Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue [3] $ (90) $ (121) $ (179) $ (243)  
Segment reporting information, Percentage of Total Consolidated Revenues [3] (4.00%) (5.00%) (3.00%) (4.00%)  
Intersegment Receivables Segment [Member]          
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Assets $ (2,456)   $ (2,456)   $ (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 $ 57 $ 128 $ 115  
Segment reporting information, Interest Income 0 1 0 1  
Segment reporting information, Depreciation and Amortization $ 3 $ 4 $ 4 $ 7  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 1.00% 1.00% 1.00% 1.00%  
Segment reporting information, Income Tax Expense (Benefit) $ (11) $ (24) $ (40) $ (45)  
Segment reporting information, Earnings (Losses) $ (55) $ (32) $ (82) $ (76)  
Segment reporting information, Percentage of Consolidated Earnings (Losses) (19.00%) (12.00%) (11.00%) (15.00%)  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 27 $ 3  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     2.00% 0.00%  
Segment reporting information, Assets $ 893   $ 893   $ 895
Segment reporting information, Percentage of Consolidated Assets 2.00%   2.00%   2.00%
Segment Reporting Information Investments In Equity Method Investees $ 86   $ 86   $ 164
[1] Derived from audited financial statements.
[2] After preferred dividends.
[3] Revenues for reportable segments include intersegment revenues of $3 million, $17 million, $24 million and $46 million for the three months ended June 30, 2015; $5 million, $36 million, $49 million and $89 million for the six months ended June 30, 2015; $2 million, $16 million, $23 million and $80 million for the three months ended June 30, 2014; and $5 million, $34 million, $45 million and $159 million for the six months ended June 30, 2014 for SDG&E, SoCalGas, Sempra Mexico and Sempra Natural Gas, respectively.