COMMITMENTS AND CONTINGENCIES - CONTRACTUAL COMMITMENTS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2013
San Diego Gas and Electric Company and Subsidiary [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Purchased Power Commitments, Payments Due, Current	$ 7
Increase (Decrease) In Purchased Power Commitments, Payments Due In Two Years	81
Increase (Decrease) In Purchased Power Commitments, Payments Due In Three Years	124
Increase (Decrease) In Purchased Power Commitments, Payments Due In Four Years	125
Increase (Decrease) In Purchased Power Commitments, Payments Due In Five Years	125
Increase (Decrease) In Purchased Power Commitments, Payments Due Thereafter	2,400
Increase (Decrease) In Purchase Commitment Amount	2,900
Southern California Gas Company [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Natural Gas Contracts Commitments	(112)
Decrease In Natural Gas Contracts Commitments, Fulfillment	366
Increase In Natural Gas Contracts Commitments, New Contracts	254
Increase (Decrease) In Natural Gas Contracts Commitments, Payments Due, Current	(220)
Increase (Decrease) In Natural Gas Contracts Commitments, Payments Due In Two Years	108
Sempra Mexico [Member]
Long-term Purchase Commitment [Line Items]
Long-term Purchase Commitment, Amount	374
Payments Under Contractual Commitments [Line Items]
Contractual Commitments, Payments Due, Current	101
Contractual Commitments, Payments Due In Two Years	303
Contractual Commitments, Payments Due In Three Years	114
Sempra Natural Gas [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Liquefied Natural Gas Commitments, Payments Due, Current	(281)
Increase (Decrease) In Liquefied Natural Gas Commitments, Payments Due In Two Years	(35)
Increase (Decrease) In Liquefied Natural Gas Commitments, Payments Due In Three Years	(23)
Increase (Decrease) In Liquefied Natural Gas Commitments, Payments Due In Four Years	(18)
Increase (Decrease) In Liquefied Natural Gas Commitments, Payments Due In Five Years	(10)
Increase (Decrease) In Liquefied Natural Gas Commitments, Payments Due Thereafter	666
Increase (Decrease) In Natural Gas Contracts Commitments	11
Increase (Decrease) In Natural Gas Contracts Commitments, Payments Due, Current	(29)
Increase (Decrease) In Natural Gas Contracts Commitments, Payments Due In Two Years	12
Increase (Decrease) In Natural Gas Contracts Commitments, Payments Due In Three Years	5
Increase (Decrease) In Natural Gas Contracts Commitments, Payments Due In Four Years	5
Increase (Decrease) In Natural Gas Contracts Commitments, Payments Due In Five Years	5
Increase (Decrease) In Natural Gas Contracts Commitments, Payments Due Thereafter	13
Sempra Natural Gas [Member] | Operations And Maintenance Mesquite Power [Member]
Payments Under Contractual Commitments [Line Items]
Contractual Commitments, Payments Due, Current	1
Contractual Commitments, Payments Due In Two Years	2
Contractual Commitments, Payments Due In Three Years	2
Contractual Commitments, Payments Due In Four Years	2
Contractual Commitments, Payments Due In Five Years	2
Contractual Commitments, Payments Due Thereafter	27
Sempra Renewables [Member]
Long-term Purchase Commitment [Line Items]
Long-term Purchase Commitment, Amount	42
Guarantee Obligations Maximum Exposure	170
Guarantee Obligations Current Carrying Value	14
Payments Under Contractual Commitments [Line Items]
Contractual Commitments, Payments Due, Current	41
Contractual Commitments, Payments Due In Two Years	1
Operating Leases [Line Items]
Operating Leases, Future Minimum Payments, Due in Two Years	2
Operating Leases, Future Minimum Payments, Due in Three Years	2
Operating Leases, Future Minimum Payments, Due in Four Years	2
Operating Leases, Future Minimum Payments, Due in Five Years	2
Operating Leases, Future Minimum Payments, Due Thereafter	75
Sempra Rockies Marketing [Member]
Payments Under Contractual Commitments [Line Items]
Contractual Commitments, Payments Due, Current	6
Contractual Commitments, Payments Due In Two Years	14
Contractual Commitments, Payments Due In Three Years	14
Contractual Commitments, Payments Due In Four Years	14
Contractual Commitments, Payments Due In Five Years	14
Contractual Commitments, Payments Due Thereafter	83
Pipeline Safety Enhancement Program [Member]
Long-term Purchase Commitment [Line Items]
Long-term Purchase Commitment, Amount	28
Payments Under Contractual Commitments [Line Items]
Contractual Commitments, Payments Due, Current	26
Contractual Commitments, Payments Due In Two Years	2
Energia Sierra Juarez wind project [Member]
Long-term Purchase Commitment [Line Items]
Long-term Purchase Commitment, Amount	144
Operations And Maintenance Mesquite Power [Member] | Sempra Natural Gas [Member]
Long-term Purchase Commitment [Line Items]
Long-term Purchase Commitment, Amount	$ 36