COMMITMENTS AND CONTINGENCIES - CONTRACTUAL COMMITMENTS 4 (Details) (Power Purchase Agreements [Member], San Diego Gas and Electric Company and Subsidiary [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2014
Power Purchase Agreements [Member] | San Diego Gas and Electric Company and Subsidiary [Member]
Capital Leases [Line Items]
Increase (Decrease) In Capital Leases Payments, Due Current	$ (16)
Increase (Decrease) In Capital Leases Payments, Due In Two Years	7
Increase (Decrease) In Capital Leases Payments, Due In Three Years	7
Increase (Decrease) In Capital Leases Payments, Due In Four Years	7
Increase (Decrease) In Capital Leases Payments, Due In Five Years	7
Increase (Decrease) In Capital Leases Payments, Due Thereafter	155
Capital Lease Obligations	$ 60