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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($)
$ / shares in Units, shares in Thousands
 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]
Selected Quarterly Financial Information [Line Items]                      
Revenues $ 3,221,000,000 $ 2,940,000,000 $ 2,564,000,000 $ 2,962,000,000 $ 2,964,000,000 $ 2,679,000,000 $ 2,533,000,000 $ 3,031,000,000 $ 11,687,000,000 $ 11,207,000,000 $ 10,183,000,000
Expenses and other income 2,160,000,000 2,513,000,000 3,673,000,000 2,295,000,000 2,567,000,000 2,674,000,000 2,136,000,000 2,279,000,000      
Operating revenues                 10,046,000,000 9,776,000,000 9,261,000,000
Net income 964,000,000 334,000,000 (530,000,000) 358,000,000 (451,000,000) 102,000,000 248,000,000 452,000,000 1,126,000,000 351,000,000 1,519,000,000
(Earnings) losses attributable to noncontrolling interest                 (76,000,000) (94,000,000) (148,000,000)
Earnings attributable to common shares                 $ 924,000,000 $ 256,000,000 $ 1,370,000,000
Earnings $ 864,000,000 $ 274,000,000 $ (561,000,000) $ 347,000,000 $ (501,000,000) $ 57,000,000 $ 259,000,000 $ 441,000,000      
Basic earnings per common share (in dollars per share) $ 3.51 $ 1.22 $ (1.99) $ 1.39 $ (1.80) $ 0.41 $ 0.99 $ 1.80 $ 3.45 $ 1.02 $ 5.48
Basic earnings per common share attributable to Sempra Energy (in dollars per share) $ 3.15 $ 1.00 $ (2.11) $ 1.34 $ (1.99) $ 0.23 $ 1.03 $ 1.76      
Weighted-average number of shares outstanding, basic (in shares) 274,300 273,900 265,800 257,900 251,900 251,700 251,400 251,100 268,072 251,545 250,217
Diluted earnings per common share (in dollars per share) $ 3.25 $ 1.21 $ (1.99) $ 1.38 $ (1.80) $ 0.41 $ 0.98 $ 1.79 $ 3.42 $ 1.01 $ 5.46
Diluted earnings per common share attributable to Sempra Energy (in dollars per share) $ 3.03 $ 0.99 $ (2.11) $ 1.33 $ (1.99) $ 0.22 $ 1.03 $ 1.75      
Weighted-average number of shares outstanding, diluted (in shares) 296,400 275,900 265,800 259,500 251,900 253,400 252,800 252,200 269,852 252,300 251,155
Dividends on preferred stock $ (36,000,000)               $ (125,000,000) $ 0 $ 0
San Diego Gas and Electric Company [Member]                      
Selected Quarterly Financial Information [Line Items]                      
Operating revenues 1,163,000,000 $ 1,299,000,000 $ 1,051,000,000 $ 1,055,000,000 $ 1,125,000,000 $ 1,236,000,000 $ 1,058,000,000 $ 1,057,000,000 4,568,000,000 4,476,000,000 4,253,000,000
Operating expenses 916,000,000 999,000,000 836,000,000 807,000,000 869,000,000 1,294,000,000 821,000,000 783,000,000 3,558,000,000 3,767,000,000 3,277,000,000
Operating income 247,000,000 300,000,000 215,000,000 248,000,000 256,000,000 (58,000,000) 237,000,000 274,000,000 1,010,000,000 709,000,000 976,000,000
Net income 145,000,000 216,000,000 146,000,000 169,000,000 130,000,000 (19,000,000) 153,000,000 157,000,000 676,000,000 421,000,000 565,000,000
(Earnings) losses attributable to noncontrolling interest 3,000,000 (11,000,000) 0 1,000,000 1,000,000 (9,000,000) (4,000,000) (2,000,000) (7,000,000) (14,000,000) 5,000,000
Earnings attributable to common shares 148,000,000 205,000,000 146,000,000 170,000,000 131,000,000 (28,000,000) 149,000,000 155,000,000 669,000,000 407,000,000 570,000,000
Southern California Gas Company [Member]                      
Selected Quarterly Financial Information [Line Items]                      
Operating revenues 1,262,000,000 802,000,000 772,000,000 1,126,000,000 1,090,000,000 684,000,000 770,000,000 1,241,000,000 3,962,000,000 3,785,000,000 3,471,000,000
Operating expenses 1,023,000,000 797,000,000 703,000,000 848,000,000 860,000,000 679,000,000 690,000,000 929,000,000 3,371,000,000 3,158,000,000 2,920,000,000
Operating income 239,000,000 5,000,000 69,000,000 278,000,000 230,000,000 5,000,000 80,000,000 312,000,000 591,000,000 627,000,000 551,000,000
Net income 156,000,000 (14,000,000) 34,000,000 225,000,000 128,000,000 7,000,000 59,000,000 203,000,000 401,000,000 397,000,000 350,000,000
Earnings attributable to common shares 156,000,000 (14,000,000) 33,000,000 225,000,000 128,000,000 7,000,000 58,000,000 203,000,000 400,000,000 396,000,000 349,000,000
Dividends on preferred stock $ 0 $ 0 $ (1,000,000) $ 0 $ 0 $ 0 $ (1,000,000) $ 0 $ (1,000,000) $ (1,000,000) $ (1,000,000)
[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.