COMMITMENTS AND CONTINGENCIES - CONTRACTUAL COMMITMENTS 2 (Details) - Jun. 30, 2015	USD ($)
San Diego Gas and Electric Company [Member] | Purchased Power Contracts [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Contractual Commitment Amount	$ (385,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, Current	(15,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Two Years	2,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Three Years	(12,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Four Years	(12,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Five Years	(18,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Thereafter	(330,000,000)
San Diego Gas and Electric Company [Member] | Construction and Development Contracts [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Contractual Commitment Amount	(64,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, Current	(125,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Two Years	35,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Three Years	(5,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Four Years	2,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Five Years	25,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Thereafter	4,000,000
Southern California Gas Company [Member] | Natural Gas Contracts [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Contractual Commitment Amount	(79,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, Current	(77,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Thereafter	(2,000,000)
Southern California Gas Company [Member] | Construction and Development Contracts [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Contractual Commitment Amount	(108,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, Current	(127,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Two Years	12,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Three Years	7,000,000
Sempra Mexico [Member] | Construction and Development Contracts [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Contractual Commitment Amount	99,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, Current	42,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Two Years	56,000,000
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	(227,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, Current	(156,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Two Years	(21,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Three Years	(20,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Four Years	(15,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Thereafter	(15,000,000)
Sempra Natural Gas [Member] | Liquefied Natural Gas Contracts [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Contractual Commitments, Payments Due, Current	(212,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Two Years	(65,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Three Years	(97,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Four Years	(121,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Five Years	(123,000,000)
Increase (Decrease) In Contractual Commitments, Payments Due, In Thereafter	$ (997,000,000)
Escalation percentage beyond year 2024	0.01
Sempra Natural Gas [Member] | Construction and Development Contracts [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Contractual Commitment Amount	$ 38,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, Current	38,000,000
Sempra Renewables [Member] | Construction and Development Contracts [Member]
Payments Under Contractual Commitments [Line Items]
Increase (Decrease) In Contractual Commitment Amount	275,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, Current	41,000,000
Increase (Decrease) In Contractual Commitments, Payments Due, In Two Years	$ 234,000,000