v3.6.0.2

SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - PROPERTY, PLANT, AND EQUIPMENT (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 43,624 | $ 38,200 |
Depreciation | 1,236 | 1,178 | $ 1,126
Accumulated depreciation | 10,693 | 10,161 |
Other non-utility [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accumulated depreciation | 755 | 860 |
Utility electric distribution operations [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accumulated depreciation | 252 | 199 |
Plant, pipeline and other distribution assets of ecogas [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accumulated depreciation | 33 | 36 |
Total Other Operating Units And Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accumulated depreciation | 1,007 | 1,059 |
Plant, pipeline and other distribution assets of Mobile Gas [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accumulated depreciation |  | 35 |
Plant, pipeline and other distribution assets of Willmut Gas [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accumulated depreciation |  | 3 |
San Diego Gas and Electric Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 17,844 | 16,458 |
Depreciation | 583 | 544 | $ 512
Accumulated depreciation | 4,594 | 4,202 |
San Diego Gas and Electric Company [Member] | Natural gas operations [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 1,897 | $ 1,642 |
Depreciation rates (percentage) | 2.40% | 2.52% | 2.72%
Accumulated depreciation | $ 721 | $ 690 |
San Diego Gas and Electric Company [Member] | Electric distribution [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 6,497 | $ 6,151 |
Depreciation rates (percentage) | 3.86% | 3.79% | 3.79%
Accumulated depreciation | $ 3,873 | $ 3,512 |
Accumulated depreciation of capital leased assets | 39 | 34 |
San Diego Gas and Electric Company [Member] | Electric transmission [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 5,152 | $ 4,870 |
Depreciation rates (percentage) | 2.66% | 2.62% | 2.59%
San Diego Gas and Electric Company [Member] | Electric generation [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 1,932 | $ 1,891 |
Depreciation rates (percentage) | 4.00% | 3.89% | 3.86%
Capital leased assets | $ 258 |  |
San Diego Gas and Electric Company [Member] | Other electric [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 1,059 | $ 981 |
Depreciation rates (percentage) | 5.66% | 5.73% | 7.09%
Capital leased assets | $ 21 | $ 20 |
San Diego Gas and Electric Company [Member] | Construction work in progress [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 1,307 | 923 |
San Diego Gas and Electric Company [Member] | Southwest Powerlink (SWPL) transmission line [Member] | Electric transmission [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 388 |  |
Ownership interest | 91.00% |  |
Accumulated depreciation | $ 229 |  |
San Diego Gas and Electric Company [Member] | Southwest Powerlink (SWPL) transmission line [Member] | Construction work in progress [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 46 |  |
Southern California Gas Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 15,344 | 14,171 |
Depreciation | 474 | 459 | $ 429
Accumulated depreciation | 5,092 | 4,900 |
Southern California Gas Company [Member] | Natural gas operations [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 14,428 | $ 13,241 |
Depreciation rates (percentage) | 3.64% | 3.83% | 3.89%
Capital leased assets | $ 32 | $ 30 |
Accumulated depreciation | 5,079 | 4,810 |
Accumulated depreciation of capital leased assets | 31 | 29 |
Southern California Gas Company [Member] | Other non-utility [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 34 | $ 110 |
Depreciation rates (percentage) | 6.55% | 3.95% | 2.88%
Accumulated depreciation | $ 13 | $ 90 |
Southern California Gas Company [Member] | Construction work in progress [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 882 | 820 |
Other Operating Units and Parent [Member] | Land and land rights [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 381 | 289 |
Other Operating Units and Parent [Member] | Land and land rights [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 20 years |  |
Other Operating Units and Parent [Member] | Land and land rights [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 55 years |  |
Other Operating Units and Parent [Member] | Land and land rights [Member] | Weighted Average [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 33 years |  |
Other Operating Units and Parent [Member] | Utility electric distribution operations [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 1,519 | 1,362 |
Other Operating Units and Parent [Member] | Utility electric distribution operations [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 12 years |  |
Other Operating Units and Parent [Member] | Utility electric distribution operations [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 60 years |  |
Other Operating Units and Parent [Member] | Utility electric distribution operations [Member] | Weighted Average [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 52 years |  |
Other Operating Units and Parent [Member] | Generating plants [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 1,874 | 782 |
Other Operating Units and Parent [Member] | Generating plants [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 3 years |  |
Other Operating Units and Parent [Member] | Generating plants [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 100 years |  |
Other Operating Units and Parent [Member] | Generating plants [Member] | Weighted Average [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 32 years |  |
Other Operating Units and Parent [Member] | LNG terminals [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 1,129 | 1,124 |
Other Operating Units and Parent [Member] | LNG terminals [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 5 years |  |
Other Operating Units and Parent [Member] | LNG terminals [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 43 years |  |
Other Operating Units and Parent [Member] | LNG terminals [Member] | Weighted Average [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 43 years |  |
Other Operating Units and Parent [Member] | Pipelines and storage [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 3,242 | 2,311 |
Other Operating Units and Parent [Member] | Pipelines and storage [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 3 years |  |
Other Operating Units and Parent [Member] | Pipelines and storage [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 55 years |  |
Other Operating Units and Parent [Member] | Pipelines and storage [Member] | Weighted Average [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 43 years |  |
Other Operating Units and Parent [Member] | Other [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 235 | 233 |
Other Operating Units and Parent [Member] | Other [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 1 year |  |
Other Operating Units and Parent [Member] | Other [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 50 years |  |
Other Operating Units and Parent [Member] | Other [Member] | Weighted Average [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 12 years |  |
Other Operating Units and Parent [Member] | Construction work in progress [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 1,488 | 1,022 |
Other Operating Units and Parent [Member] | Other [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 568 | 448 |
Capital leased assets | $ 136 | 136 |
Other Operating Units and Parent [Member] | Other [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 1 year |  |
Other Operating Units and Parent [Member] | Other [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 80 years |  |
Other Operating Units and Parent [Member] | Other [Member] | Weighted Average [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 32 years |  |
Other Operating Units and Parent [Member] | Plant, pipeline and other distribution assets of ecogas [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 128 | 142 |
Other Operating Units and Parent [Member] | Total Other Operating Units And Parent [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 10,436 | 7,571 |
Other Operating Units and Parent [Member] | Plant, pipeline and other distribution assets of Mobile Gas [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment |  | 204 |
Other Operating Units and Parent [Member] | Plant, pipeline and other distribution assets of Willmut Gas [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment |  | $ 28 |

X
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