OTHER FINANCIAL DATA - PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Benefits
Net Periodic Benefit Cost
Service cost	$ 26	$ 27
Interest cost	41	37
Expected return on assets	(43)	(40)
Amortization of prior service cost	2	1
Amortization of actuarial loss	5	15
Settlement	3	0
Regulatory adjustment	(24)	(32)
Total net periodic benefit cost	10	8
Pension and Other Postretirement Benefit Contributions [Abstract]
Contributions to pension plans	15
Defined Benefit Plans Estimated Future Employer Contributions	187
Pension Benefits | San Diego Gas and Electric Company and Subsidiary [Member]
Net Periodic Benefit Cost
Service cost	8	8
Interest cost	11	10
Expected return on assets	(14)	(13)
Amortization of prior service cost	0	0
Amortization of actuarial loss	1	4
Regulatory adjustment	(5)	(8)
Total net periodic benefit cost	1	1
Pension and Other Postretirement Benefit Contributions [Abstract]
Contributions to pension plans	1
Defined Benefit Plans Estimated Future Employer Contributions	65
Pension Benefits | Southern California Gas Company [Member]
Net Periodic Benefit Cost
Service cost	16	16
Interest cost	25	23
Expected return on assets	(26)	(25)
Amortization of prior service cost	2	1
Amortization of actuarial loss	2	9
Regulatory adjustment	(19)	(24)
Total net periodic benefit cost	0	0
Pension and Other Postretirement Benefit Contributions [Abstract]
Contributions to pension plans	2
Defined Benefit Plans Estimated Future Employer Contributions	86
Other Postretirement Benefits
Net Periodic Benefit Cost
Service cost	6	7
Interest cost	12	11
Expected return on assets	(16)	(15)
Amortization of prior service cost	(1)	(1)
Amortization of actuarial loss	0	2
Settlement	0	0
Regulatory adjustment	0	2
Total net periodic benefit cost	1	6
Pension and Other Postretirement Benefit Contributions [Abstract]
Contributions to other postretirement benefit plans	1
Defined Benefit Plans Estimated Future Employer Contributions	12
Other Postretirement Benefits | San Diego Gas and Electric Company and Subsidiary [Member]
Net Periodic Benefit Cost
Service cost	2	2
Interest cost	2	2
Expected return on assets	(3)	(2)
Amortization of prior service cost	1	1
Amortization of actuarial loss	0	0
Regulatory adjustment	(2)	0
Total net periodic benefit cost	0	3
Pension and Other Postretirement Benefit Contributions [Abstract]
Contributions to other postretirement benefit plans	0
Defined Benefit Plans Estimated Future Employer Contributions	9
Other Postretirement Benefits | Southern California Gas Company [Member]
Net Periodic Benefit Cost
Service cost	4	4
Interest cost	9	9
Expected return on assets	(13)	(12)
Amortization of prior service cost	(2)	(2)
Amortization of actuarial loss	0	2
Regulatory adjustment	2	2
Total net periodic benefit cost	0	3
Pension and Other Postretirement Benefit Contributions [Abstract]
Contributions to other postretirement benefit plans	0
Defined Benefit Plans Estimated Future Employer Contributions	$ 0