DEBT AND CREDIT FACILITIES - MATURITIES OF LONG-TERM DEBT (5 YEAR SCHEDULE) (Details)	Dec. 31, 2017 USD ($)
Schedule Of Long Term Debt Maturities [Line Items]
2018	$ 1,412,000,000
2019	1,419,000,000
2020	1,033,000,000
2021	1,346,000,000
2022	647,000,000
Thereafter	11,282,000,000
Long-term Debt Maturities, Total Repayments Of Principal	17,139,000,000
San Diego Gas and Electric Company [Member]
Schedule Of Long Term Debt Maturities [Line Items]
2018	207,000,000
2019	321,000,000
2020	36,000,000
2021	385,000,000
2022	18,000,000
Thereafter	3,901,000,000
Long-term Debt Maturities, Total Repayments Of Principal	4,868,000,000
Southern California Gas Company [Member]
Schedule Of Long Term Debt Maturities [Line Items]
2018	500,000,000
2019	0
2020	0
2021	0
2022	0
Thereafter	2,509,000,000
Long-term Debt Maturities, Total Repayments Of Principal	3,009,000,000
Other Sempra Energy [Member]
Schedule Of Long Term Debt Maturities [Line Items]
2018	705,000,000
2019	1,098,000,000
2020	997,000,000
2021	961,000,000
2022	629,000,000
Thereafter	4,872,000,000
Long-term Debt Maturities, Total Repayments Of Principal	$ 9,262,000,000