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COMMITMENTS AND CONTINGENCIES - LESSEE CASH FLOW INFORMATION (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Lessee, Lease, Description [Line Items] |  |
Cash paid for operating leases | $ 39,000,000 |
Cash paid for finance leases | 43,000,000 |
Cash paid for finance leases | 5,000,000 |
Increase in operating lease obligations for right-of-use assets | 552,000,000 |
Increase in finance lease obligations for investment in PP&E | 7,000,000 | $ 5,000,000
Southern California Gas Company [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Cash paid for operating leases | 7,000,000 |
Cash paid for finance leases | 0 |
Cash paid for finance leases | 1,000,000 | 0
Increase in operating lease obligations for right-of-use assets | 117,000,000 |
Increase in finance lease obligations for investment in PP&E | 3,000,000 | 5,000,000
San Diego Gas and Electric Company [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Cash paid for operating leases | 8,000,000 |
Cash paid for finance leases | 43,000,000 |
Cash paid for finance leases | 4,000,000 |
Increase in operating lease obligations for right-of-use assets | 142,000,000 |
Increase in finance lease obligations for investment in PP&E | $ 4,000,000 | $ 0

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- Definition Amount of cash outflow for principal payment on finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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