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INCOME TAXES - COMPONENTS OF INCOME TAX EXPENSE (BENEFIT) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. $ (102) $ 878 $ 773
Non-U.S. 912 707 1,057
Pretax income 810 1,585 1,830
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal (2) 0 0
U.S. state 66 0 1
Non-U.S. 214 116 171
Total 278 116 172
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal (120) 536 78
U.S. state (159) 297 9
Non-U.S. 101 327 135
Total (178) 1,160 222
Deferred investment tax credits (4) 0 (5)
Total income tax expense 96 1,276 [1] 389 [1]
San Diego Gas and Electric Company [Member]      
Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Pretax income 849 576 845
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal 104 100 0
U.S. state 30 65 22
Total 134 165 22
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal 17 29 223
U.S. state 24 (41) 38
Total 41 (12) 261
Deferred investment tax credits (2) 2 (3)
Total income tax expense 173 155 [1] 280 [1]
Southern California Gas Company [Member]      
Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Pretax income 493 557 493
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal 4 0 0
U.S. state 10 23 40
Total 14 23 40
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal 78 144 123
U.S. state 2 (5) (18)
Total 80 139 105
Deferred investment tax credits (2) (2) (2)
Total income tax expense $ 92 $ 160 [1] $ 143 [1]
[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.