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SEGMENT INFORMATION (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenues $ 9,647 $ 10,036 $ 9,003
Segment reporting information, Percentage of Total Consolidated Revenues 100.00% 100.00% 100.00%
Segment reporting information, Interest Expense 493 465 436
Segment reporting information, Interest Income 24 26 16
Segment reporting information, Depreciation and Amortization 1,090 976 866
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 100.00% 100.00% 100.00%
Segment reporting information, Income Tax Expense (Benefit) 59 394 133
Segment reporting information, earnings (losses) 859 1,331 709
Segment reporting information, Percentage of Consolidated Earnings (Losses) 100.00% 100.00% 100.00%
Segment Reporting Information, Additional Information [Abstract]      
Segment reporting information, Expenditures for Property, Plant & Equipment 2,956 2,844 2,062
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment 100.00% 100.00% 100.00%
Segment reporting information, Assets 36,499 33,249 30,231
Segment reporting information, Percentage of Consolidated Assets 100.00% 100.00% 100.00%
Losses reclassified between Parent and Mexico   13 22
S D G E Segment [Member]
     
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenues 3,694 3,373 3,049
Segment reporting information, Percentage of Total Consolidated Revenues 38.00% 34.00% 34.00%
Segment reporting information, Interest Expense 173 142 136
Segment reporting information, Depreciation and Amortization 490 422 381
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 45.00% 43.00% 44.00%
Segment reporting information, Income Tax Expense (Benefit) 190 237 173
Segment reporting information, earnings (losses) 484 [1] 431 [1] 369 [1]
Segment reporting information, Percentage of Consolidated Earnings (Losses) 56.00% 32.00% 52.00%
Segment Reporting Information, Additional Information [Abstract]      
Segment reporting information, Expenditures for Property, Plant & Equipment 1,237 1,831 1,210
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment 42.00% 64.00% 59.00%
Segment reporting information, Assets 14,744 13,555 12,077
Segment reporting information, Percentage of Consolidated Assets 40.00% 41.00% 40.00%
Segment Reporting Information, Intersegment Revenue 8 6 6
So Cal Gas Segment [Member]
     
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenues 3,282 3,816 3,822
Segment reporting information, Percentage of Total Consolidated Revenues 34.00% 38.00% 43.00%
Segment reporting information, Interest Expense 68 69 66
Segment reporting information, Interest Income   1 1
Segment reporting information, Depreciation and Amortization 362 331 309
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 33.00% 34.00% 36.00%
Segment reporting information, Income Tax Expense (Benefit) 79 143 176
Segment reporting information, earnings (losses) 289 [1] 287 [1] 286 [1]
Segment reporting information, Percentage of Consolidated Earnings (Losses) 34.00% 22.00% 40.00%
Segment Reporting Information, Additional Information [Abstract]      
Segment reporting information, Expenditures for Property, Plant & Equipment 639 683 503
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment 22.00% 24.00% 24.00%
Segment reporting information, Assets 9,071 8,475 7,986
Segment reporting information, Percentage of Consolidated Assets 25.00% 25.00% 26.00%
Segment Reporting Information, Intersegment Revenue 46 53 44
All Other Segments [Member]
     
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Interest Expense 251 233 243
Segment reporting information, Interest Income 4   3
Segment reporting information, Depreciation and Amortization 11 11 16
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 1.00% 1.00% 2.00%
Segment reporting information, Income Tax Expense (Benefit) (141) (109) (300)
Segment reporting information, earnings (losses) (55) (126) (211)
Segment reporting information, Percentage of Consolidated Earnings (Losses) (6.00%) (10.00%) (30.00%)
Segment Reporting Information, Additional Information [Abstract]      
Segment reporting information, Expenditures for Property, Plant & Equipment 4 4 4
Segment reporting information, Assets 818 442 1,776
Segment reporting information, Percentage of Consolidated Assets 2.00% 1.00% 6.00%
Intercompany Eliminations Segment [Member]
     
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenues (2) (2) (5)
Segment reporting information, Interest Expense (159) (125) (142)
Segment reporting information, Interest Income (58) (32) (32)
Segment Reporting Information, Additional Information [Abstract]      
Segment reporting information, Expenditures for Property, Plant & Equipment   (205) [2]  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment   (7.00%)  
Intersegment Revenues Segment [Member]
     
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenues (372) [3] (621) [3] (709) [3]
Segment reporting information, Percentage of Total Consolidated Revenues (4.00%) (6.00%) (8.00%)
Intersegment Receivables Segment [Member]
     
Segment Reporting Information, Additional Information [Abstract]      
Segment reporting information, Assets (1,619) (1,654) (1,751)
Segment reporting information, Percentage of Consolidated Assets (4.00%) (5.00%) (6.00%)
Sempra South American Utilities Segment [Member]
     
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenues 1,441 1,080 1
Segment reporting information, Percentage of Total Consolidated Revenues 15.00% 11.00%  
Segment reporting information, Interest Expense 32 34 8
Segment reporting information, Interest Income 15 22 7
Segment reporting information, Depreciation and Amortization 56 40  
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 5.00% 4.00%  
Segment reporting information, Income Tax Expense (Benefit) 78 42  
Segment reporting information, earnings (losses) 164 425 69
Segment reporting information, Percentage of Consolidated Earnings (Losses) 19.00% 32.00% 10.00%
Segment Reporting Information, Additional Information [Abstract]      
Segment reporting information, Expenditures for Property, Plant & Equipment 183 110  
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment 6.00% 4.00%  
Segment reporting information, Assets 3,310 2,981 796
Segment reporting information, Percentage of Consolidated Assets 9.00% 9.00% 3.00%
Sempra Mexico Segment [Member]
     
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenues 605 736 827
Segment reporting information, Percentage of Total Consolidated Revenues 6.00% 7.00% 9.00%
Segment reporting information, Interest Expense 8 19 26
Segment reporting information, Interest Income 2 1 1
Segment reporting information, Depreciation and Amortization 62 63 62
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 6.00% 6.00% 7.00%
Segment reporting information, Income Tax Expense (Benefit) 73 37 64
Segment reporting information, earnings (losses) 157 192 116
Segment reporting information, Percentage of Consolidated Earnings (Losses) 18.00% 14.00% 17.00%
Segment Reporting Information, Additional Information [Abstract]      
Segment reporting information, Expenditures for Property, Plant & Equipment 45 16 15
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment 2.00%   1.00%
Segment reporting information, Assets 2,591 2,502 2,616
Segment reporting information, Percentage of Consolidated Assets 7.00% 8.00% 9.00%
Segment Reporting Information, Intersegment Revenue 108 300 327
Sempra Renewables Segment [Member]
     
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenues 68 22 9
Segment reporting information, Percentage of Total Consolidated Revenues 1.00%    
Segment reporting information, Interest Expense 22 13 7
Segment reporting information, Interest Income 6    
Segment reporting information, Depreciation and Amortization 16 6 2
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 1.00% 1.00%  
Segment reporting information, Income Tax Expense (Benefit) (63) (28) (24)
Segment reporting information, earnings (losses) 61 7 9
Segment reporting information, Percentage of Consolidated Earnings (Losses) 7.00% 1.00% 1.00%
Segment Reporting Information, Additional Information [Abstract]      
Segment reporting information, Expenditures for Property, Plant & Equipment 717 248 123
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment 24.00% 9.00% 6.00%
Segment reporting information, Assets 2,439 1,210 599
Segment reporting information, Percentage of Consolidated Assets 7.00% 4.00% 2.00%
Sempra Natural Gas Segment [Member]
     
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenues 931 1,632 2,009
Segment reporting information, Percentage of Total Consolidated Revenues 10.00% 16.00% 22.00%
Segment reporting information, Interest Expense 98 80 92
Segment reporting information, Interest Income 55 34 36
Segment reporting information, Depreciation and Amortization 93 103 96
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 9.00% 11.00% 11.00%
Segment reporting information, Income Tax Expense (Benefit) (157) 72 44
Segment reporting information, earnings (losses) (241) 115 71
Segment reporting information, Percentage of Consolidated Earnings (Losses) (28.00%) 9.00% 10.00%
Segment Reporting Information, Additional Information [Abstract]      
Segment reporting information, Expenditures for Property, Plant & Equipment 131 157 207
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment 4.00% 6.00% 10.00%
Segment reporting information, Assets 5,145 5,738 6,132
Segment reporting information, Percentage of Consolidated Assets 14.00% 17.00% 20.00%
Segment Reporting Information, Intersegment Revenue $ 210 $ 262 $ 332
[1] After preferred dividends.
[2] Amount represents elimination of intercompany sale of El Dorado power plant in 2011, as we discuss in Note 14.
[3] Revenues for reportable segments include intersegment revenues of: $8 million, $46 million, $108 million and $210 million for 2012, $6 million, $53 million, $300 million and $262 million for 2011, and $6 million, $44 million, $327 million and $332 million for 2010 for SDG&E, SoCalGas, Sempra Mexico and Sempra Natural Gas, respectively.