OTHER FINANCIAL DATA - PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pension Benefits
Net Periodic Benefit Cost
Service cost	$ 26	$ 27	$ 52	$ 54
Interest cost	41	39	82	76
Expected return on assets	(43)	(42)	(86)	(82)
Amortization of prior service cost	3	1	5	2
Amortization of actuarial loss	5	15	10	30
Settlement	6	0	9	0
Regulatory adjustment	0	(19)	(24)	(51)
Total net periodic benefit cost	38	21	48	29
Pension and Other Postretirement Benefit Contributions [Abstract]
Contributions to pension plans	58
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	7	8	15	16
Interest cost	11	11	22	21
Expected return on assets	(14)	(13)	(28)	(26)
Amortization of prior service cost	1	1	1	1
Amortization of actuarial loss	1	3	2	7
Settlement	2	0	2	0
Regulatory adjustment	6	2	1	(6)
Total net periodic benefit cost	14	12	15	13
Pension and Other Postretirement Benefit Contributions [Abstract]
Contributions to pension plans	17
Defined Benefit Plans Estimated Future Employer Contributions	65
Pension Benefits | Southern California Gas Company [Member]
Net Periodic Benefit Cost
Service cost	16	17	32	33
Interest cost	26	23	51	46
Expected return on assets	(26)	(24)	(52)	(49)
Amortization of prior service cost	2	0	4	1
Amortization of actuarial loss	2	8	4	17
Regulatory adjustment	(6)	(21)	(25)	(45)
Total net periodic benefit cost	14	3	14	3
Pension and Other Postretirement Benefit Contributions [Abstract]
Contributions to pension plans	16
Defined Benefit Plans Estimated Future Employer Contributions	86
Other Postretirement Benefits
Net Periodic Benefit Cost
Service cost	6	6	12	13
Interest cost	12	12	24	23
Expected return on assets	(16)	(14)	(32)	(29)
Amortization of prior service cost	(1)	(1)	(2)	(2)
Amortization of actuarial loss	0	3	0	5
Settlement	0	0	0	0
Regulatory adjustment	0	2	0	4
Total net periodic benefit cost	1	8	2	14
Pension and Other Postretirement Benefit Contributions [Abstract]
Contributions to other postretirement benefit plans	2
Defined Benefit Plans Estimated Future Employer Contributions	11
Other Postretirement Benefits | San Diego Gas and Electric Company and Subsidiary [Member]
Net Periodic Benefit Cost
Service cost	1	2	3	4
Interest cost	2	2	4	4
Expected return on assets	(3)	(2)	(6)	(4)
Amortization of prior service cost	1	1	2	2
Amortization of actuarial loss	0	0	0	0
Settlement	0	0	0	0
Regulatory adjustment	(1)	0	(3)	0
Total net periodic benefit cost	0	3	0	6
Pension and Other Postretirement Benefit Contributions [Abstract]
Contributions to other postretirement benefit plans	0
Defined Benefit Plans Estimated Future Employer Contributions	8
Other Postretirement Benefits | Southern California Gas Company [Member]
Net Periodic Benefit Cost
Service cost	4	4	8	8
Interest cost	10	9	19	18
Expected return on assets	(13)	(12)	(26)	(24)
Amortization of prior service cost	(2)	(2)	(4)	(4)
Amortization of actuarial loss	0	2	0	4
Regulatory adjustment	1	2	3	4
Total net periodic benefit cost	0	3	0	6
Pension and Other Postretirement Benefit Contributions [Abstract]
Contributions to other postretirement benefit plans	0
Defined Benefit Plans Estimated Future Employer Contributions	$ 0