REVENUES - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	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.