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SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 2,156 $ 2,367 $ 4,778 $ 5,049  
Segment reporting information, Percentage of Total Consolidated Revenues 100.00% 100.00% 100.00% 100.00%  
Segment reporting information, Interest Expense $ 142 $ 139 $ 285 $ 273  
Segment reporting information, Interest Income 6 10 12 17  
Segment reporting information, Depreciation and Amortization $ 314 $ 307 $ 642 $ 610  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 100.00% 100.00% 100.00% 100.00%  
Segment reporting information, Income Tax Expense (Benefit) $ (106) $ 98 $ 36 $ 261  
Equity Earnings (Losses) Recorded Before Tax 14 27 (8) 46  
Segment reporting information, Equity Earnings (Losses) Recorded Net of Tax 33 22 50 37  
Segment reporting information, Earnings (Losses) 16 295 335 732  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 2,006 $ 1,466  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     100.00% 100.00%  
Segment reporting information, Assets $ 42,875   $ 42,875   $ 41,150 [1]
Segment reporting information, Percentage of Consolidated Assets 100.00%   100.00%   100.00%
Equity Method and Other Investments $ 2,267   $ 2,267   $ 2,905 [1]
S D G E Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 992 $ 972 $ 1,983 $ 1,938  
Segment reporting information, Percentage of Total Consolidated Revenues 46.00% 41.00% 41.00% 38.00%  
Segment reporting information, Interest Expense $ 48 $ 52 $ 96 $ 104  
Segment reporting information, Depreciation and Amortization $ 158 $ 149 $ 317 $ 294  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 50.00% 48.00% 49.00% 48.00%  
Segment reporting information, Income Tax Expense (Benefit) $ 48 $ 54 $ 120 $ 142  
Segment reporting information, Earnings (Losses) 100 126 229 273  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 602 $ 600  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     30.00% 41.00%  
Segment reporting information, Assets $ 17,039   $ 17,039   $ 16,515
Segment reporting information, Percentage of Consolidated Assets 40.00%   40.00%   40.00%
Segment Reporting Information, Intersegment Revenues $ 0 3 $ 3 $ 5  
So Cal Gas Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 617 $ 780 $ 1,650 $ 1,828  
Segment reporting information, Percentage of Total Consolidated Revenues 29.00% 33.00% 35.00% 36.00%  
Segment reporting information, Interest Expense $ 24 $ 19 $ 46 $ 38  
Segment reporting information, Interest Income 0 3 0 3  
Segment reporting information, Depreciation and Amortization $ 112 $ 113 $ 234 $ 226  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 36.00% 37.00% 36.00% 37.00%  
Segment reporting information, Income Tax Expense (Benefit) $ (29) $ 16 $ 58 $ 111  
Segment reporting information, Earnings (Losses) [2] (1) 70 194 284  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 650 $ 603  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     32.00% 41.00%  
Segment reporting information, Assets $ 13,086   $ 13,086   $ 12,104
Segment reporting information, Percentage of Consolidated Assets 30.00%   30.00%   29.00%
Segment Reporting Information, Intersegment Revenues $ 18 17 $ 35 $ 36  
Sempra South American Utilities Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 385 $ 389 $ 785 $ 778  
Segment reporting information, Percentage of Total Consolidated Revenues 18.00% 16.00% 16.00% 15.00%  
Segment reporting information, Interest Expense $ 11 $ 8 $ 20 $ 13  
Segment reporting information, Interest Income 5 5 10 9  
Segment reporting information, Depreciation and Amortization $ 14 $ 12 $ 27 $ 25  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 4.00% 4.00% 4.00% 4.00%  
Segment reporting information, Income Tax Expense (Benefit) $ 15 $ 18 $ 29 $ 34  
Segment reporting information, Equity Earnings (Losses) Recorded Net of Tax 0 0 2 (1)  
Segment reporting information, Earnings (Losses) 43 45 81 86  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 82 $ 66  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     4.00% 5.00%  
Segment reporting information, Assets $ 3,486   $ 3,486   $ 3,235
Segment reporting information, Percentage of Consolidated Assets 8.00%   8.00%   8.00%
Equity Method and Other Investments $ (1)   $ (1)   $ (4)
Sempra Mexico Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 147 $ 152 $ 285 $ 315  
Segment reporting information, Percentage of Total Consolidated Revenues 7.00% 6.00% 6.00% 6.00%  
Segment reporting information, Interest Expense $ 4 $ 6 $ 8 $ 11  
Segment reporting information, Interest Income 1 2 3 4  
Segment reporting information, Depreciation and Amortization $ 15 $ 17 $ 32 $ 34  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 5.00% 6.00% 5.00% 6.00%  
Segment reporting information, Income Tax Expense (Benefit) $ (12) $ 5 $ 29 $ 13  
Segment reporting information, Equity Earnings (Losses) Recorded Net of Tax 33 22 48 38  
Segment reporting information, Earnings (Losses) 57 50 74 97  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 140 $ 120  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     7.00% 8.00%  
Segment reporting information, Assets $ 3,925   $ 3,925   $ 3,783
Segment reporting information, Percentage of Consolidated Assets 9.00%   9.00%   9.00%
Equity Method and Other Investments $ 548   $ 548   $ 519
Segment Reporting Information, Intersegment Revenues 27 24 54 $ 49  
Sempra Renewables Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 6 $ 10 $ 13 $ 18  
Segment reporting information, Percentage of Total Consolidated Revenues 0.00% 1.00% 0.00% 1.00%  
Segment reporting information, Interest Expense $ 0 $ 1 $ 0 $ 2  
Segment reporting information, Interest Income 0 1 1 1  
Segment reporting information, Depreciation and Amortization $ 2 $ 1 $ 3 $ 3  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 1.00% 0.00% 1.00% 0.00%  
Segment reporting information, Income Tax Expense (Benefit) $ (9) $ (11) $ (21) $ (28)  
Equity Earnings (Losses) Recorded Before Tax 11 10 18 12  
Segment reporting information, Earnings (Losses) 12 19 25 32  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 457 $ 22  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     23.00% 1.00%  
Segment reporting information, Assets $ 1,838   $ 1,838   $ 1,441
Segment reporting information, Percentage of Consolidated Assets 4.00%   4.00%   4.00%
Equity Method and Other Investments $ 827   $ 827   $ 855
Sempra Natural Gas Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 90 $ 155 $ 220 $ 352  
Segment reporting information, Percentage of Total Consolidated Revenues 4.00% 7.00% 5.00% 7.00%  
Segment reporting information, Interest Expense $ 10 $ 23 $ 22 $ 44  
Segment reporting information, Interest Income 17 25 33 44  
Segment reporting information, Depreciation and Amortization $ 12 $ 12 $ 25 $ 24  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 4.00% 4.00% 4.00% 4.00%  
Segment reporting information, Income Tax Expense (Benefit) $ (99) $ 27 $ (124) $ 29  
Equity Earnings (Losses) Recorded Before Tax 3 17 (26) 34  
Segment reporting information, Earnings (Losses) (149) 40 (185) 42  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 68 $ 28  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     3.00% 2.00%  
Segment reporting information, Assets $ 5,396   $ 5,396   $ 5,566
Segment reporting information, Percentage of Consolidated Assets 13.00%   13.00%   13.00%
Equity Method and Other Investments $ 818   $ 818   $ 1,460
Segment Reporting Information, Intersegment Revenues 36 46 66 $ 89  
Adjustments and Eliminations [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue $ 0 $ (1) $ 0 $ (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 $ (29) $ (35) $ (53) $ (67)  
Segment reporting information, Interest Income (17) (26) (35) (44)  
Intersegment Revenues Segment [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Revenue [3] $ (81) $ (90) $ (158) $ (179)  
Segment reporting information, Percentage of Total Consolidated Revenues [3] (4.00%) (4.00%) (3.00%) (3.00%)  
Intersegment Receivables Segment [Member]          
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Assets $ (2,698)   $ (2,698)   $ (2,228)
Segment reporting information, Percentage of Consolidated Assets (6.00%)   (6.00%)   (5.00%)
All Other Segments [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment reporting information, Interest Expense $ 74 $ 65 $ 146 $ 128  
Segment reporting information, Depreciation and Amortization $ 1 $ 3 $ 4 $ 4  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 0.00% 1.00% 1.00% 1.00%  
Segment reporting information, Income Tax Expense (Benefit) $ (20) $ (11) $ (55) $ (40)  
Segment reporting information, Earnings (Losses) (46) $ (55) (83) (82)  
Segment Reporting Information, Additional Information [Abstract]          
Segment reporting information, Expenditures for property plant and equipment     $ 7 $ 27  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment     1.00% 2.00%  
Segment reporting information, Assets $ 803   $ 803   $ 734
Segment reporting information, Percentage of Consolidated Assets 2.00%   2.00%   2.00%
Equity Method and Other Investments $ 75   $ 75   $ 75
[1] Derived from audited financial statements.
[2] After preferred dividends.
[3] Revenues for reportable segments include intersegment revenues of a negligible amount, $18 million, $27 million and $36 million for the three months ended June 30, 2016; $3 million, $35 million, $54 million and $66 million for the six months ended June 30, 2016; $3 million, $17 million, $24 million and $46 million for the three months ended June 30, 2015; and $5 million, $36 million, $49 million and $89 million for the six months ended June 30, 2015 for SDG&E, SoCalGas, Sempra Mexico and Sempra Natural Gas, respectively.