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COMMITMENTS AND CONTINGENCIES - CONTRACTUAL COMMITMENTS (Details) - Sempra Natural Gas [Member]
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Natural Gas Contracts [Member]  
Payments Under Contractual Commitments [Line Items]  
Increase (Decrease) In Commitment Amount $ (46)
Increase (Decrease) In Commitment Amount, Payments Due, Current (60)
Increase (Decrease) In Commitment Amount, Payments Due, In Two Years 10
Increase (Decrease) In Commitment Amount, Payments Due, In Three Years $ 4
Liquefied Natural Gas Contracts [Member]  
Payments Under Contractual Commitments [Line Items]  
Escalation Percentage Beyond Year 2028 1.00%
Increase (Decrease) In Commitment Amount, Payments Due, Current $ (146)
Increase (Decrease) In Commitment Amount, Payments Due, In Two Years (3)
Increase (Decrease) In Commitment Amount, Payments Due, In Three Years (7)
Increase (Decrease) In Commitment Amount, Payments Due, In Four Years (18)
Increase (Decrease) In Commitment Amount, Payments Due, In Five Years (30)
Increase (Decrease) In Commitment Amount, Payments Due, In Thereafter $ 20