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REVENUES - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | [1] | Dec. 31, 2016 | [1]
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | $ 11,027 |  |
Utilities regulatory revenues |  |  |  |  |  |  |  |  | 165 |  |
Other revenues |  |  |  |  |  |  |  |  | 495 |  |
Total revenues | $ 3,221 | $ 2,940 | $ 2,564 | $ 2,962 | $ 2,964 | $ 2,679 | $ 2,533 | $ 3,031 | 11,687 | $ 11,207 | $ 10,183
Over time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 10,756 |  |
Point in time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 271 |  |
Utilities service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 9,881 |  |
Midstream service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 716 |  |
Renewables service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 154 |  |
Other service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 276 |  |
Electric market [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 6,227 |  |
Gas market [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 4,800 |  |
Operating Segments [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 4,788 |  |
Utilities regulatory revenues |  |  |  |  |  |  |  |  | (220) |  |
Other revenues |  |  |  |  |  |  |  |  | 0 |  |
Total revenues |  |  |  |  |  |  |  |  | 4,568 |  |
Operating Segments [Member] | San Diego Gas and Electric Company [Member] | Over time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 4,677 |  |
Operating Segments [Member] | San Diego Gas and Electric Company [Member] | Point in time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 111 |  |
Operating Segments [Member] | San Diego Gas and Electric Company [Member] | Utilities service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 4,788 |  |
Operating Segments [Member] | San Diego Gas and Electric Company [Member] | Midstream service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 |  |
Operating Segments [Member] | San Diego Gas and Electric Company [Member] | Renewables service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 |  |
Operating Segments [Member] | San Diego Gas and Electric Company [Member] | Other service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 |  |
Operating Segments [Member] | San Diego Gas and Electric Company [Member] | Electric market [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 4,297 |  |
Operating Segments [Member] | San Diego Gas and Electric Company [Member] | Gas market [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 491 |  |
Operating Segments [Member] | Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 3,577 |  |
Utilities regulatory revenues |  |  |  |  |  |  |  |  | 385 |  |
Other revenues |  |  |  |  |  |  |  |  | 0 |  |
Total revenues |  |  |  |  |  |  |  |  | 3,962 |  |
Operating Segments [Member] | Southern California Gas Company [Member] | Over time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 3,454 |  |
Operating Segments [Member] | Southern California Gas Company [Member] | Point in time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 123 |  |
Operating Segments [Member] | Southern California Gas Company [Member] | Utilities service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 3,577 |  |
Operating Segments [Member] | Southern California Gas Company [Member] | Midstream service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 |  |
Operating Segments [Member] | Southern California Gas Company [Member] | Renewables service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 |  |
Operating Segments [Member] | Southern California Gas Company [Member] | Other service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 |  |
Operating Segments [Member] | Southern California Gas Company [Member] | Electric market [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 |  |
Operating Segments [Member] | Southern California Gas Company [Member] | Gas market [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 3,577 |  |
Operating Segments [Member] | Sempra South American Utilities [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 1,580 |  |
Utilities regulatory revenues |  |  |  |  |  |  |  |  | 0 |  |
Other revenues |  |  |  |  |  |  |  |  | 5 |  |
Total revenues |  |  |  |  |  |  |  |  | 1,585 |  |
Operating Segments [Member] | Sempra South American Utilities [Member] | Over time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 1,554 |  |
Operating Segments [Member] | Sempra South American Utilities [Member] | Point in time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 26 |  |
Operating Segments [Member] | Sempra South American Utilities [Member] | Utilities service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 1,507 |  |
Operating Segments [Member] | Sempra South American Utilities [Member] | Midstream service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 |  |
Operating Segments [Member] | Sempra South American Utilities [Member] | Renewables service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 |  |
Operating Segments [Member] | Sempra South American Utilities [Member] | Other service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 73 |  |
Operating Segments [Member] | Sempra South American Utilities [Member] | Electric market [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 1,580 |  |
Operating Segments [Member] | Sempra South American Utilities [Member] | Gas market [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 |  |
Operating Segments [Member] | Sempra Mexico [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 1,019 |  |
Utilities regulatory revenues |  |  |  |  |  |  |  |  | 0 |  |
Other revenues |  |  |  |  |  |  |  |  | 357 |  |
Total revenues |  |  |  |  |  |  |  |  | 1,376 |  |
Operating Segments [Member] | Sempra Mexico [Member] | Over time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 1,019 |  |
Operating Segments [Member] | Sempra Mexico [Member] | Point in time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 |  |
Operating Segments [Member] | Sempra Mexico [Member] | Utilities service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 78 |  |
Operating Segments [Member] | Sempra Mexico [Member] | Midstream service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 630 |  |
Operating Segments [Member] | Sempra Mexico [Member] | Renewables service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 108 |  |
Operating Segments [Member] | Sempra Mexico [Member] | Other service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 203 |  |
Operating Segments [Member] | Sempra Mexico [Member] | Electric market [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 308 |  |
Operating Segments [Member] | Sempra Mexico [Member] | Gas market [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 711 |  |
Operating Segments [Member] | Sempra Renewables [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 46 |  |
Utilities regulatory revenues |  |  |  |  |  |  |  |  | 0 |  |
Other revenues |  |  |  |  |  |  |  |  | 78 |  |
Total revenues |  |  |  |  |  |  |  |  | 124 |  |
Operating Segments [Member] | Sempra Renewables [Member] | Over time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 46 |  |
Operating Segments [Member] | Sempra Renewables [Member] | Point in time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 |  |
Operating Segments [Member] | Sempra Renewables [Member] | Utilities service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 |  |
Operating Segments [Member] | Sempra Renewables [Member] | Midstream service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 |  |
Operating Segments [Member] | Sempra Renewables [Member] | Renewables service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 46 |  |
Operating Segments [Member] | Sempra Renewables [Member] | Other service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 |  |
Operating Segments [Member] | Sempra Renewables [Member] | Electric market [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 46 |  |
Operating Segments [Member] | Sempra Renewables [Member] | Gas market [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 |  |
Operating Segments [Member] | Sempra LNG & Midstream [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 232 |  |
Utilities regulatory revenues |  |  |  |  |  |  |  |  | 0 |  |
Other revenues |  |  |  |  |  |  |  |  | 240 |  |
Total revenues |  |  |  |  |  |  |  |  | 472 |  |
Operating Segments [Member] | Sempra LNG & Midstream [Member] | Over time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 210 |  |
Operating Segments [Member] | Sempra LNG & Midstream [Member] | Point in time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 22 |  |
Operating Segments [Member] | Sempra LNG & Midstream [Member] | Utilities service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 |  |
Operating Segments [Member] | Sempra LNG & Midstream [Member] | Midstream service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 224 |  |
Operating Segments [Member] | Sempra LNG & Midstream [Member] | Renewables service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 2 |  |
Operating Segments [Member] | Sempra LNG & Midstream [Member] | Other service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 6 |  |
Operating Segments [Member] | Sempra LNG & Midstream [Member] | Electric market [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 8 |  |
Operating Segments [Member] | Sempra LNG & Midstream [Member] | Gas market [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 224 |  |
Consolidating Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | (215) |  |
Utilities regulatory revenues |  |  |  |  |  |  |  |  | 0 |  |
Other revenues |  |  |  |  |  |  |  |  | (185) |  |
Total revenues |  |  |  |  |  |  |  |  | (400) |  |
Consolidating Adjustments [Member] | Over time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | (204) |  |
Consolidating Adjustments [Member] | Point in time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | (11) |  |
Consolidating Adjustments [Member] | Utilities service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | (69) |  |
Consolidating Adjustments [Member] | Midstream service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | (138) |  |
Consolidating Adjustments [Member] | Renewables service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | (2) |  |
Consolidating Adjustments [Member] | Other service line [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | (6) |  |
Consolidating Adjustments [Member] | Electric market [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | (12) |  |
Consolidating Adjustments [Member] | Gas market [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | $ (203) |  |
[1] | As adjusted for the retrospective adoption of ASU 2017-07, which we discuss in Note 2, and a reclassification to conform to current year presentation, which we discuss in Note 1.

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