v3.6.0.2
INCOME TAXES - COMPONENTS OF INCOME TAX EXPENSE (BENEFIT) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal $ 0 $ 3 $ (10)
U.S. state 1 (24) (7)
Non-U.S. 171 123 171
Total 172 102 154
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal 78 242 237
U.S. state 9 34 4
Non-U.S. 135 (32) (91)
Total 222 244 150
Deferred investment tax credits (5) (5) (4)
Total income tax expense 389 341 300
Parent Company [Member]      
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Total income tax expense (181) (150) (133)
San Diego Gas and Electric Company [Member]      
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal 0 12 (5)
U.S. state 22 77 52
Total 22 89 47
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal 223 233 220
U.S. state 38 (35) 5
Total 261 198 225
Deferred investment tax credits (3) (3) (2)
Total income tax expense 280 284 270
Southern California Gas Company [Member]      
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal 0 (1) 2
U.S. state 40 12 7
Total 40 11 9
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal 123 122 117
U.S. state (18) 7 15
Total 105 129 132
Deferred investment tax credits (2) (2) (2)
Total income tax expense $ 143 $ 138 $ 139