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COMMITMENTS AND CONTINGENCIES - LONG-TERM PURCHASE COMMITMENT (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Long-term Purchase Commitment [Line Items]      
Contractual Commitments, Payments Due, Current $ 592    
Contractual Commitments, Payments Due In Two Years 230    
Contractual Commitments, Payments Due In Three Years 128    
Contractual Commitments, Payments Due In Four Years 30    
Contractual Commitments, Payments Due In Five Years 17    
Unrecorded Unconditional Purchase Obligation, Due after Five Years 80    
Contractual Commitments, Payments Due, Total 1,077    
S D G E Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Contractual Commitments, Payments Due, Current 229    
Contractual Commitments, Payments Due In Two Years 36    
Contractual Commitments, Payments Due In Three Years 11    
Contractual Commitments, Payments Due In Four Years 24    
Contractual Commitments, Payments Due In Five Years 17    
Unrecorded Unconditional Purchase Obligation, Due after Five Years 62    
Long-term Purchase Commitment, Amount 379    
Contractual Commitment Number of Years 30    
Proceeds From Long Term Transmission Agreement 85    
Natural Gas Contracts [Member]
      
Long-term Purchase Commitment [Line Items]      
Contractual Commitments, Payments Due, Current 682 [1]    
Contractual Commitments, Payments Due In Two Years 229 [1]    
Contractual Commitments, Payments Due In Three Years 107 [1]    
Contractual Commitments, Payments Due In Four Years 72 [1]    
Contractual Commitments, Payments Due In Five Years 68 [1]    
Unrecorded Unconditional Purchase Obligation, Due after Five Years 322 [1]    
Contractual Commitments, Payments Due, Total 1,480 [1]    
Long-term Purchase Commitment, Payments In Period 1,345 1,991 2,097
Natural Gas Contracts [Member] | So Cal Gas Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Contractual Commitments, Payments Due, Current 538    
Contractual Commitments, Payments Due In Two Years 124    
Contractual Commitments, Payments Due In Three Years 76    
Contractual Commitments, Payments Due In Four Years 41    
Contractual Commitments, Payments Due In Five Years 37    
Unrecorded Unconditional Purchase Obligation, Due after Five Years 158    
Contractual Commitments, Payments Due, Total 974    
Long-term Purchase Commitment, Payments In Period 1,222 1,810 1,936
Natural Gas Transportation Contracts [Member]
      
Long-term Purchase Commitment [Line Items]      
Contractual Commitments, Payments Due, Current 135    
Contractual Commitments, Payments Due In Two Years 124    
Contractual Commitments, Payments Due In Three Years 94    
Contractual Commitments, Payments Due In Four Years 59    
Contractual Commitments, Payments Due In Five Years 55    
Unrecorded Unconditional Purchase Obligation, Due after Five Years 294    
Contractual Commitments, Payments Due, Total 761    
Natural Gas Transportation Contracts [Member] | So Cal Gas Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Contractual Commitments, Payments Due, Current 116    
Contractual Commitments, Payments Due In Two Years 105    
Contractual Commitments, Payments Due In Three Years 75    
Contractual Commitments, Payments Due In Four Years 40    
Contractual Commitments, Payments Due In Five Years 36    
Unrecorded Unconditional Purchase Obligation, Due after Five Years 158    
Contractual Commitments, Payments Due, Total 530    
Natural Gas Supply Contracts [Member]
      
Long-term Purchase Commitment [Line Items]      
Contractual Commitments, Payments Due, Current 547 [1]    
Contractual Commitments, Payments Due In Two Years 105 [1]    
Contractual Commitments, Payments Due In Three Years 13 [1]    
Contractual Commitments, Payments Due In Four Years 13 [1]    
Contractual Commitments, Payments Due In Five Years 13 [1]    
Unrecorded Unconditional Purchase Obligation, Due after Five Years 28 [1]    
Contractual Commitments, Payments Due, Total 719 [1]    
Natural Gas Supply Contracts [Member] | So Cal Gas Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Contractual Commitments, Payments Due, Current 422    
Contractual Commitments, Payments Due In Two Years 19    
Contractual Commitments, Payments Due In Three Years 1    
Contractual Commitments, Payments Due In Four Years 1    
Contractual Commitments, Payments Due In Five Years 1    
Contractual Commitments, Payments Due, Total 444    
Purchased Power Contracts [Member]
      
Long-term Purchase Commitment [Line Items]      
Contractual Commitments, Payments Due, Current 1,257 [2]    
Contractual Commitments, Payments Due In Two Years 1,275 [2]    
Contractual Commitments, Payments Due In Three Years 1,349 [2]    
Contractual Commitments, Payments Due In Four Years 1,385 [2]    
Contractual Commitments, Payments Due In Five Years 1,397 [2]    
Unrecorded Unconditional Purchase Obligation, Due after Five Years 10,978 [2]    
Contractual Commitments, Payments Due, Total 17,641 [2]    
Long-term Purchase Commitment, Payments In Period 1,205 918 314
Purchased Power Contracts [Member] | S D G E Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Contractual Commitments, Payments Due, Current 405 [2]    
Contractual Commitments, Payments Due In Two Years 383 [2]    
Contractual Commitments, Payments Due In Three Years 372 [2]    
Contractual Commitments, Payments Due In Four Years 372 [2]    
Contractual Commitments, Payments Due In Five Years 368 [2]    
Unrecorded Unconditional Purchase Obligation, Due after Five Years 3,999 [2]    
Contractual Commitments, Payments Due, Total 5,899 [2]    
Long-term Purchase Commitment, Payments In Period 381 346 314
Purchased Power Contracts [Member] | Sempra South American Utilities Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Long-term Purchase Commitment, Payments In Period 824 572  
Purchased Power Contracts [Member] | Sempra Renewables Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Guarantee Obligations Maximum Exposure 80    
Guarantee Obligations Current Carrying Value 2    
Debt Service Operations [Member] | Sempra Renewables Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Guarantee Obligations Maximum Exposure 158    
Guarantee Obligations Current Carrying Value 10    
Sunrise Powerlink Construction [Member] | S D G E Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Contractual Commitment Annual Escalation Percentage 2.00%    
Contractual Commitment Number of Years 58    
Contractual Commitment Future Annual Payment Amount 3    
Contractual Commitment Present Value Future Payments, Regulatory Asset 117    
Contractual Commitment Future Payments, Liability 114    
East County Substation [Member] | S D G E Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Long-term Purchase Commitment, Payments In Period 192    
Liquefied Natural Gas Contracts [Member]
      
Long-term Purchase Commitment [Line Items]      
Long Term Purchase Commitment Estimated Annual Escalation After 2021 1.00%    
Liquefied Natural Gas Contracts [Member] | Sempra Natural Gas Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Contractual Commitments, Payments Due, Current 565    
Contractual Commitments, Payments Due In Two Years 650    
Contractual Commitments, Payments Due In Three Years 687    
Contractual Commitments, Payments Due In Four Years 721    
Contractual Commitments, Payments Due In Five Years 758    
Unrecorded Unconditional Purchase Obligation, Due after Five Years 11,300    
Nuclear Plant Maintenance [Member] | San Diego Gas and Electric Company and Subsidiary [Member]
      
Long-term Purchase Commitment [Line Items]      
Long-term Purchase Commitment, Amount 165    
Natural Gas Infrastructure Construction [Member] | S D G E Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Long-term Purchase Commitment, Amount 22    
Natural Gas Infrastructure Construction [Member] | So Cal Gas Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Contractual Commitments, Payments Due, Current 76    
Contractual Commitments, Payments Due In Two Years 15    
Contractual Commitments, Payments Due In Three Years 14    
Contractual Commitments, Payments Due In Four Years 6    
Unrecorded Unconditional Purchase Obligation, Due after Five Years 18    
Contractual Commitments, Payments Due, Total 129    
DWR Allocations [Member] | San Diego Gas and Electric Company and Subsidiary [Member]
      
Long-term Purchase Commitment [Line Items]      
Purchase Commitment Component Percentage 2.00%    
SONGS [Member] | San Diego Gas and Electric Company and Subsidiary [Member]
      
Long-term Purchase Commitment [Line Items]      
Purchase Commitment Component Percentage 3.00%    
Long-term Contracts [Member] | San Diego Gas and Electric Company and Subsidiary [Member]
      
Long-term Purchase Commitment [Line Items]      
Purchase Commitment Component Percentage 31.00%    
Other Owned Generation [Member] | San Diego Gas and Electric Company and Subsidiary [Member]
      
Long-term Purchase Commitment [Line Items]      
Purchase Commitment Component Percentage 50.00%    
Spot Market Purchases [Member] | San Diego Gas and Electric Company and Subsidiary [Member]
      
Long-term Purchase Commitment [Line Items]      
Purchase Commitment Component Percentage 14.00%    
Renewable Energy Contracts Expiring Through 2037 [Member] | San Diego Gas and Electric Company and Subsidiary [Member]
      
Long-term Purchase Commitment [Line Items]      
Purchase Commitment Component Percentage 17.00%    
Luz del Sur Hydroelectric Power Plant [Member] | Sempra South American Utilities Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Contractual Commitments, Payments Due, Total 70    
Sempra South American Utilities Construction [Member] | Sempra South American Utilities Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Contractual Commitments, Payments Due, Current 70    
Contractual Commitments, Payments Due In Two Years 8    
Contractual Commitments, Payments Due, Total 78    
Sempra Renewables Construction [Member] | Sempra Renewables Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Contractual Commitments, Payments Due, Current 50    
Contractual Commitments, Payments Due In Two Years 30    
Contractual Commitments, Payments Due In Three Years 103    
Contractual Commitments, Payments Due, Total 183    
Sempra Natural Gas Construction [Member] | Sempra Natural Gas Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Contractual Commitments, Payments Due, Current 28    
Contractual Commitments, Payments Due In Two Years 1    
Contractual Commitments, Payments Due, Total 29    
Sempra Mexico Construction [Member] | Sempra Mexico Segment [Member]
      
Long-term Purchase Commitment [Line Items]      
Contractual Commitments, Payments Due, Current 139    
Contractual Commitments, Payments Due In Two Years 140    
Contractual Commitments, Payments Due, Total $ 279    
[1] Excludes amounts related to LNG purchase agreements as discussed below.
[2] Excludes purchase agreements accounted for as capital leases and amounts related to Otay Mesa VIE, as it is consolidated by Sempra Energy and SDG&E.