COMMITMENTS AND CONTINGENCIES - CONTRACTUAL COMMITMENTS 2 (Details) (USD $)	Sep. 30, 2014
San Diego Gas and Electric Company and Subsidiary [Member] | Purchased Power Contracts [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Contractual Commitment Amount	$ 1,100,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, Current	(2,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Two Years	(46,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Three Years	(1,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Four Years	24,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Five Years	54,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Thereafter	1,100,000,000
San Diego Gas and Electric Company and Subsidiary [Member] | Construction and Development Contracts [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Contractual Commitment Amount	161,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, Current	20,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Two Years	116,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Three Years	12,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Four Years	9,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Five Years	6,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Thereafter	(2,000,000)
Southern California Gas Company [Member] | Natural Gas Contracts [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Contractual Commitment Amount	(110,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, Current	(140,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Two Years	30,000,000
Southern California Gas Company [Member] | Construction and Development Contracts [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Contractual Commitment Amount	119,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, Current	71,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Two Years	65,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Three Years	1,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Four Years	(18,000,000)
Sempra Mexico [Member] | Construction and Development Contracts [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Contractual Commitment Amount	(115,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, Current	(81,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Two Years	(33,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Thereafter	(1,000,000)
Sempra Natural Gas [Member] | Natural Gas Contracts [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Contractual Commitment Amount	567,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, Current	(57,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Two Years	174,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Three Years	159,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Four Years	162,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Five Years	129,000,000
Sempra Natural Gas [Member] | Liquefied Natural Gas Contracts [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Contractual Commitments, Payments Due, Current	(624,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Two Years	(11,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Three Years	10,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Four Years	30,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Five Years	36,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Thereafter	345,000,000
Sempra Renewables [Member] | Construction and Development Contracts [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Contractual Commitment Amount	(544,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, Current	(504,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Two Years	$ (40,000,000)