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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - PROPERTY, PLANT, AND EQUIPMENT (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 49,315 | $ 48,108 |
Depreciation | 1,528 | 1,422 | $ 1,236
Accumulated depreciation | 12,519 | 11,605 |
San Diego Gas and Electric Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 21,662 | 19,787 |
Depreciation | 686 | 621 | 583
Accumulated depreciation | 5,352 | 4,949 |
Southern California Gas Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 18,138 | 16,772 |
Depreciation | 553 | 514 | $ 474
Accumulated depreciation | 5,699 | 5,366 |
Electricity [Member] | San Diego Gas and Electric Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accumulated depreciation | 4,558 | 4,193 |
Accumulated depreciation of capital leased assets | 48 | 47 |
Natural gas operations [Member] | San Diego Gas and Electric Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 2,382 | $ 2,186 |
Depreciation rates (percentage) | 2.44% | 2.40% | 2.40%
Accumulated depreciation | $ 794 | $ 756 |
Natural gas operations [Member] | Southern California Gas Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 17,268 | $ 15,759 |
Depreciation rates (percentage) | 3.60% | 3.63% | 3.64%
Capital leased assets | $ 40 | $ 34 |
Accumulated depreciation | 5,685 | 5,352 |
Accumulated depreciation of capital leased assets | 37 | 33 |
Electric distribution [Member] | San Diego Gas and Electric Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 7,462 | $ 6,975 |
Depreciation rates (percentage) | 3.91% | 3.92% | 3.86%
Electric transmission [Member] | San Diego Gas and Electric Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 6,222 | $ 5,626 |
Depreciation rates (percentage) | 2.76% | 2.71% | 2.66%
Electric generation [Member] | San Diego Gas and Electric Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 2,967 | $ 2,435 |
Depreciation rates (percentage) | 4.12% | 4.05% | 4.00%
Capital leased assets | $ 1,300 | $ 757 |
Other electric [Member] | San Diego Gas and Electric Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 1,408 | $ 1,114 |
Depreciation rates (percentage) | 6.43% | 5.54% | 5.66%
Capital leased assets | $ 13 | $ 22 |
Other non-utility [Member] | Southern California Gas Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 34 | $ 32 |
Depreciation rates (percentage) | 5.39% | 5.28% | 6.55%
Accumulated depreciation | $ 14 | $ 14 |
Other non-utility [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accumulated depreciation | 1,125 | 972 |
Construction work in progress [Member] | San Diego Gas and Electric Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 1,221 | 1,451 |
Construction work in progress [Member] | Southern California Gas Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 836 | 981 |
Land and land rights [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 429 | 416 |
Land and land rights [Member] | Minimum [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 16 years |  |
Land and land rights [Member] | Maximum [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 50 years |  |
Land and land rights [Member] | Weighted Average [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 30 years |  |
Utility electric distribution operations [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 1,977 | 1,751 |
Accumulated depreciation | $ 343 | 318 |
Utility electric distribution operations [Member] | Minimum [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 10 years |  |
Utility electric distribution operations [Member] | Maximum [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 45 years |  |
Utility electric distribution operations [Member] | Weighted Average [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 41 years |  |
Generating plants [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 1,051 | 2,242 |
Generating plants [Member] | Minimum [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 5 years |  |
Generating plants [Member] | Maximum [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 100 years |  |
Generating plants [Member] | Weighted Average [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 30 years |  |
LNG terminals [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 1,134 | 1,133 |
LNG terminals [Member] | Minimum [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 43 years |  |
LNG terminals [Member] | Maximum [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 43 years |  |
LNG terminals [Member] | Weighted Average [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 43 years |  |
Pipelines and storage [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 3,413 | 4,408 |
Pipelines and storage [Member] | Minimum [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 5 years |  |
Pipelines and storage [Member] | Maximum [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 50 years |  |
Pipelines and storage [Member] | Weighted Average [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 41 years |  |
Other [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 205 | 269 |
Other [Member] | Minimum [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 1 year |  |
Other [Member] | Maximum [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 50 years |  |
Other [Member] | Weighted Average [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 7 years |  |
Construction work in progress [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 684 | 691 |
Other [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 622 | 639 |
Capital leased assets | 136 | 136 |
Leasehold Improvements, Gross | 24 | 24 |
Accumulated depreciation of capital leased assets | $ 10 | 7 |
Other [Member] | Minimum [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 3 years |  |
Other [Member] | Maximum [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 80 years |  |
Other [Member] | Weighted Average [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 31 years |  |
Leasehold Improvements [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accumulated depreciation | $ 3 | 2 |
Plant, pipeline and other distribution assets of ecogas [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accumulated depreciation | 43 | 39 |
Plant, pipeline and other distribution assets of ecogas [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 154 | 145 |
Total Other Operating Units And Parent [Member] | Other Operating Units and Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 9,515 | 11,549 |
Accumulated depreciation | 1,468 | $ 1,290 |
Southwest Powerlink (SWPL) transmission line [Member] | Electric transmission [Member] | San Diego Gas and Electric Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 457 |  |
Ownership interest | 92.00% |  |
Accumulated depreciation | $ 252 |  |
Southwest Powerlink (SWPL) transmission line [Member] | Construction work in progress [Member] | San Diego Gas and Electric Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 26 |  |

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