EMPLOYEE BENEFIT PLANS - EMPLOYEE BENEFIT PLANS (Details) - USD ($)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]
Noncurrent liabilities	$ (1,208,000,000)	$ (1,152,000,000)
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]
Future amortization of gain (loss) in 2017	10,000,000
Future amortization of prior service cost (credit) in 2017	$ 1,000,000
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Expected return on plan assets	7.00%
Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	$ 3,649,000,000	3,839,000,000
Service cost	107,000,000	114,000,000	$ 101,000,000
Interest cost	160,000,000	154,000,000	161,000,000
Contributions from plan participants	0	0
Actuarial loss (gain)	116,000,000	(180,000,000)
Benefit payments	(217,000,000)	(273,000,000)
Divestiture of EnergySouth	(61,000,000)	0
Plan amendments	0	5,000,000
Special termination benefits	0	0
Settlements	(75,000,000)	(10,000,000)
Ending balance	3,679,000,000	3,649,000,000	3,839,000,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	2,484,000,000	2,807,000,000
Actual return on plan assets	207,000,000	(73,000,000)
Employer contributions	104,000,000	33,000,000
Contributions from plan participants	0	0
Benefit payments	(217,000,000)	(273,000,000)
Divestiture of EnergySouth	(44,000,000)	0
Settlements	(75,000,000)	(10,000,000)
Ending balance	2,459,000,000	2,484,000,000	2,807,000,000
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status	(1,220,000,000)	(1,165,000,000)
Net recorded liability	(1,220,000,000)	(1,165,000,000)
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]
Noncurrent assets	0	0
Current liabilities	(56,000,000)	(43,000,000)
Noncurrent liabilities	(1,164,000,000)	(1,122,000,000)
Net recorded (liability) asset	(1,220,000,000)	(1,165,000,000)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax [Abstract]
Net actuarial (loss) gain	(95,000,000)	(84,000,000)
Prior service cost	(4,000,000)	(5,000,000)
Total	(99,000,000)	(89,000,000)
Accumulated benefit obligation	3,465,000,000	3,397,000,000
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation	3,431,000,000	3,410,000,000
Accumulated benefit obligation	3,227,000,000	3,183,000,000
Fair value of plan assets	2,459,000,000	2,484,000,000
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	107,000,000	114,000,000	101,000,000
Interest cost	160,000,000	154,000,000	161,000,000
Expected return on assets	(166,000,000)	(173,000,000)	(171,000,000)
Amortization of Prior service cost (credit)	11,000,000	11,000,000	11,000,000
Amortization of actuarial loss (gain)	30,000,000	38,000,000	18,000,000
Settlement and curtailment charges	16,000,000	4,000,000	31,000,000
Special termination benefits	0	0	0
Regulatory adjustment	(57,000,000)	(110,000,000)	(31,000,000)
Defined Benefit Plan, Net Periodic Benefit Cost, Total	101,000,000	38,000,000	120,000,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]
Net loss (gain)	26,000,000	17,000,000	38,000,000
Prior service (credit) cost	(1,000,000)	4,000,000	4,000,000
Amortization of actuarial loss	(10,000,000)	(14,000,000)	(23,000,000)
Total recognized in other comprehensive income (loss)	15,000,000	7,000,000	19,000,000
Total recognized in net periodic benefit cost and other comprehensive income (loss)	$ 116,000,000	$ 45,000,000	$ 139,000,000
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.08%	4.46%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.46%	4.09%	4.85%
Expected return on plan assets	7.00%	7.00%	7.00%
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Expected employer contributions	$ 180,000,000
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2017	347,000,000
2018	317,000,000
2019	304,000,000
2020	291,000,000
20121	295,000,000
2022-2026	$ 1,254,000,000
Pension Plan [Member] \| Maximum [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	10.00%	10.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	10.00%	10.00%	10.00%
Pension Plan [Member] \| Minimum [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	2.00%	2.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	2.00%	2.00%	3.50%
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	$ 963,000,000	$ 1,115,000,000
Service cost	20,000,000	26,000,000	$ 24,000,000
Interest cost	42,000,000	44,000,000	49,000,000
Contributions from plan participants	20,000,000	19,000,000
Actuarial loss (gain)	(81,000,000)	(172,000,000)
Benefit payments	(61,000,000)	(60,000,000)
Divestiture of EnergySouth	(6,000,000)	0
Plan amendments	0	(9,000,000)
Special termination benefits	26,000,000	0
Settlements	(1,000,000)	0
Ending balance	922,000,000	963,000,000	1,115,000,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	1,003,000,000	1,054,000,000
Actual return on plan assets	94,000,000	(21,000,000)
Employer contributions	6,000,000	11,000,000
Contributions from plan participants	20,000,000	19,000,000
Benefit payments	(61,000,000)	(60,000,000)
Divestiture of EnergySouth	(4,000,000)	0
Settlements	(1,000,000)	0
Ending balance	1,057,000,000	1,003,000,000	1,054,000,000
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status	135,000,000	40,000,000
Net recorded liability	135,000,000	40,000,000
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]
Noncurrent assets	179,000,000	70,000,000
Current liabilities	0	0
Noncurrent liabilities	(44,000,000)	(30,000,000)
Net recorded (liability) asset	135,000,000	40,000,000
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax [Abstract]
Net actuarial (loss) gain	3,000,000	2,000,000
Prior service cost	0	0
Total	3,000,000	2,000,000
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	20,000,000	26,000,000	24,000,000
Interest cost	42,000,000	44,000,000	49,000,000
Expected return on assets	(69,000,000)	(68,000,000)	(63,000,000)
Amortization of Prior service cost (credit)	0	(4,000,000)	(5,000,000)
Amortization of actuarial loss (gain)	(1,000,000)	0	0
Settlement and curtailment charges	0	0	(1,000,000)
Special termination benefits	26,000,000	0	5,000,000
Regulatory adjustment	(11,000,000)	12,000,000	6,000,000
Defined Benefit Plan, Net Periodic Benefit Cost, Total	7,000,000	10,000,000	15,000,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]
Net loss (gain)	(2,000,000)	(4,000,000)	1,000,000
Prior service (credit) cost	0	0	0
Amortization of actuarial loss	0	0	0
Total recognized in other comprehensive income (loss)	(2,000,000)	(4,000,000)	1,000,000
Total recognized in net periodic benefit cost and other comprehensive income (loss)	$ 5,000,000	$ 6,000,000	$ 16,000,000
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.19%	4.49%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.49%	4.15%	4.95%
Expected return on plan assets	6.98%	6.98%	6.97%
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Effect of 1% increase on total of service and interest cost components of net periodic postretirement health care benefit cost	$ 5,000,000
Effect of 1% decrease on total of service and interest cost components of net periodic postretirement health care benefit cost	(4,000,000)
Effect of 1% increase on the health care component of the accumulated other postretirement benefit obligations	62,000,000
Effect of 1% decrease on the health care component of the accumulated other postretirement benefit obligations	(52,000,000)
Expected employer contributions	8,000,000
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2017	47,000,000
2018	51,000,000
2019	53,000,000
2020	56,000,000
20121	55,000,000
2022-2026	$ 277,000,000
Other Postretirement Benefit Plan [Member] \| Pre-65Retiree [Member]
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Health care cost trend rate assumed for next year	8.00%	8.10%	7.75%
Rate to which the cost trend rate is assumed to decline (the ultimate trend)	5.00%	5.00%	5.00%
Year the rate reaches the ultimate trend	2022	2022	2020
Other Postretirement Benefit Plan [Member] \| Retiree Aged 65 or Older [Member]
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Health care cost trend rate assumed for next year	5.50%	5.50%	5.25%
Rate to which the cost trend rate is assumed to decline (the ultimate trend)	4.50%	4.50%	4.50%
Year the rate reaches the ultimate trend	2022	2022	2020
Other Postretirement Benefit Plan [Member] \| Maximum [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	10.00%	10.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	10.00%	10.00%	10.00%
Other Postretirement Benefit Plan [Member] \| Minimum [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	2.00%	2.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	2.00%	2.00%	3.50%
San Diego Gas and Electric Company [Member]
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]
Noncurrent liabilities	$ (232,000,000)	$ (212,000,000)
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]
Future amortization of gain (loss) in 2017	1,000,000
Future amortization of prior service cost (credit) in 2017	0
San Diego Gas and Electric Company [Member] \| Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	965,000,000	1,011,000,000
Service cost	29,000,000	29,000,000	$ 30,000,000
Interest cost	41,000,000	39,000,000	43,000,000
Contributions from plan participants	0	0
Actuarial loss (gain)	7,000,000	(52,000,000)
Benefit payments	(25,000,000)	(56,000,000)
Special termination benefits	0	0
Settlements	(75,000,000)	0
Transfer of liability to other plans	(7,000,000)	(6,000,000)
Ending balance	935,000,000	965,000,000	1,011,000,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	752,000,000	828,000,000
Actual return on plan assets	59,000,000	(24,000,000)
Employer contributions	3,000,000	2,000,000
Contributions from plan participants	0	0
Benefit payments	(25,000,000)	(56,000,000)
Transfer of assets from other plans	0	2,000,000
Settlements	(75,000,000)	0
Ending balance	714,000,000	752,000,000	828,000,000
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status	(221,000,000)	(213,000,000)
Net recorded liability	(221,000,000)	(213,000,000)
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]
Current liabilities	(10,000,000)	(5,000,000)
Noncurrent liabilities	(211,000,000)	(208,000,000)
Net recorded (liability) asset	(221,000,000)	(213,000,000)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax [Abstract]
Net actuarial (loss) gain	(8,000,000)	(8,000,000)
Prior service cost	0	0
Total	(8,000,000)	(8,000,000)
Accumulated benefit obligation	904,000,000	939,000,000
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation	902,000,000	927,000,000
Accumulated benefit obligation	874,000,000	906,000,000
Fair value of plan assets	714,000,000	752,000,000
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	29,000,000	29,000,000	30,000,000
Interest cost	41,000,000	39,000,000	43,000,000
Expected return on assets	(49,000,000)	(54,000,000)	(55,000,000)
Amortization of Prior service cost (credit)	1,000,000	8,000,000	2,000,000
Amortization of actuarial loss (gain)	10,000,000	2,000,000	4,000,000
Settlement charge	16,000,000	0	19,000,000
Special termination benefits	0	0	0
Regulatory adjustment	(45,000,000)	(20,000,000)	12,000,000
Defined Benefit Plan, Net Periodic Benefit Cost, Total	3,000,000	4,000,000	55,000,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]
Net loss (gain)	1,000,000	(6,000,000)	8,000,000
Amortization of actuarial loss	(1,000,000)	(1,000,000)	(3,000,000)
Total recognized in other comprehensive income (loss)	0	(7,000,000)	5,000,000
Total recognized in net periodic benefit cost and other comprehensive income (loss)	$ 3,000,000	$ (3,000,000)	$ 60,000,000
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.08%	4.35%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.35%	4.00%	4.69%
Expected return on plan assets	7.00%	7.00%	7.00%
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Expected employer contributions	$ 38,000,000
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2017	94,000,000
2018	84,000,000
2019	81,000,000
2020	77,000,000
20121	73,000,000
2022-2026	$ 322,000,000
San Diego Gas and Electric Company [Member] \| Pension Plan [Member] \| Maximum [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	10.00%	10.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	10.00%	10.00%	10.00%
San Diego Gas and Electric Company [Member] \| Pension Plan [Member] \| Minimum [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	2.00%	2.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	2.00%	2.00%	3.50%
San Diego Gas and Electric Company [Member] \| Other Postretirement Benefit Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	$ 165,000,000	$ 200,000,000
Service cost	5,000,000	7,000,000	$ 7,000,000
Interest cost	7,000,000	8,000,000	9,000,000
Contributions from plan participants	7,000,000	7,000,000
Actuarial loss (gain)	6,000,000	(43,000,000)
Benefit payments	(14,000,000)	(14,000,000)
Special termination benefits	14,000,000	0
Settlements	0	0
Transfer of liability to other plans	0	0
Ending balance	190,000,000	165,000,000	200,000,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	161,000,000	164,000,000
Actual return on plan assets	13,000,000	(3,000,000)
Employer contributions	2,000,000	7,000,000
Contributions from plan participants	7,000,000	7,000,000
Benefit payments	(14,000,000)	(14,000,000)
Transfer of assets from other plans	0	0
Settlements	0	0
Ending balance	169,000,000	161,000,000	164,000,000
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status	(21,000,000)	(4,000,000)
Net recorded liability	(21,000,000)	(4,000,000)
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]
Current liabilities	0	0
Noncurrent liabilities	(21,000,000)	(4,000,000)
Net recorded (liability) asset	(21,000,000)	(4,000,000)
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	5,000,000	7,000,000	7,000,000
Interest cost	7,000,000	8,000,000	9,000,000
Expected return on assets	(12,000,000)	(11,000,000)	(10,000,000)
Amortization of Prior service cost (credit)	3,000,000	3,000,000	2,000,000
Amortization of actuarial loss (gain)	(1,000,000)	0	0
Settlement charge	0	0	0
Special termination benefits	14,000,000	0	5,000,000
Regulatory adjustment	(14,000,000)	0	1,000,000
Defined Benefit Plan, Net Periodic Benefit Cost, Total	2,000,000	7,000,000	14,000,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]
Net loss (gain)	0	0	0
Amortization of actuarial loss	0	0	0
Total recognized in other comprehensive income (loss)	0	0	0
Total recognized in net periodic benefit cost and other comprehensive income (loss)	$ 2,000,000	$ 7,000,000	$ 14,000,000
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.15%	4.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.50%	4.15%	5.00%
Expected return on plan assets	6.90%	6.91%	6.88%
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Effect of 1% increase on total of service and interest cost components of net periodic postretirement health care benefit cost	$ 1,000,000
Effect of 1% decrease on total of service and interest cost components of net periodic postretirement health care benefit cost	(1,000,000)
Effect of 1% increase on the health care component of the accumulated other postretirement benefit obligations	6,000,000
Effect of 1% decrease on the health care component of the accumulated other postretirement benefit obligations	(5,000,000)
Expected employer contributions	5,000,000
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2017	10,000,000
2018	11,000,000
2019	11,000,000
2020	12,000,000
20121	12,000,000
2022-2026	$ 61,000,000
San Diego Gas and Electric Company [Member] \| Other Postretirement Benefit Plan [Member] \| Maximum [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	10.00%	10.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	10.00%	10.00%	10.00%
San Diego Gas and Electric Company [Member] \| Other Postretirement Benefit Plan [Member] \| Minimum [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	2.00%	2.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	2.00%	2.00%	3.50%
Southern California Gas Company [Member]
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]
Future amortization of gain (loss) in 2017	$ 1,000,000
Future amortization of prior service cost (credit) in 2017	1,000,000
Southern California Gas Company [Member] \| Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	2,255,000,000	$ 2,398,000,000
Service cost	67,000,000	74,000,000	$ 60,000,000
Interest cost	101,000,000	98,000,000	100,000,000
Contributions from plan participants	0	0
Actuarial loss (gain)	77,000,000	(131,000,000)
Benefit payments	(158,000,000)	(187,000,000)
Plan amendments	0	3,000,000
Special termination benefits	0	0
Transfer of liability to other plans	1,000,000	0
Ending balance	2,343,000,000	2,255,000,000	2,398,000,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	1,537,000,000	1,763,000,000
Actual return on plan assets	128,000,000	(45,000,000)
Employer contributions	72,000,000	6,000,000
Contributions from plan participants	0	0
Benefit payments	(158,000,000)	(187,000,000)
Ending balance	1,579,000,000	1,537,000,000	1,763,000,000
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status	(764,000,000)	(718,000,000)
Net recorded liability	(764,000,000)	(718,000,000)
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]
Noncurrent assets	0	0
Current liabilities	(2,000,000)	(2,000,000)
Noncurrent liabilities	(762,000,000)	(716,000,000)
Net recorded (liability) asset	(764,000,000)	(718,000,000)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax [Abstract]
Net actuarial (loss) gain	(6,000,000)	(4,000,000)
Prior service cost	(3,000,000)	(1,000,000)
Total	(9,000,000)	(5,000,000)
Accumulated benefit obligation	2,167,000,000	2,056,000,000
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation	2,320,000,000	2,236,000,000
Accumulated benefit obligation	2,148,000,000	2,039,000,000
Fair value of plan assets	1,579,000,000	1,537,000,000
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	67,000,000	74,000,000	60,000,000
Interest cost	101,000,000	98,000,000	100,000,000
Expected return on assets	(103,000,000)	(106,000,000)	(104,000,000)
Amortization of Prior service cost (credit)	9,000,000	9,000,000	9,000,000
Amortization of actuarial loss (gain)	11,000,000	21,000,000	6,000,000
Settlement charge	0	0	4,000,000
Special termination benefits	0	0	0
Regulatory adjustment	(12,000,000)	(90,000,000)	(43,000,000)
Defined Benefit Plan, Net Periodic Benefit Cost, Total	73,000,000	6,000,000	32,000,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]
Net loss (gain)	4,000,000	0	5,000,000
Prior service (credit) cost	2,000,000	2,000,000	0
Amortization of actuarial loss	0	0	(5,000,000)
Total recognized in other comprehensive income (loss)	6,000,000	2,000,000	0
Total recognized in net periodic benefit cost and other comprehensive income (loss)	$ 79,000,000	$ 8,000,000	$ 32,000,000
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.10%	4.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.50%	4.15%	4.94%
Expected return on plan assets	7.00%	7.00%	7.00%
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Expected employer contributions	$ 90,000,000
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2017	194,000,000
2018	189,000,000
2019	184,000,000
2020	175,000,000
20121	177,000,000
2022-2026	$ 804,000,000
Southern California Gas Company [Member] \| Pension Plan [Member] \| Maximum [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	10.00%	10.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	10.00%	10.00%	10.00%
Southern California Gas Company [Member] \| Pension Plan [Member] \| Minimum [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	2.00%	2.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	2.00%	2.00%	3.50%
Southern California Gas Company [Member] \| Other Postretirement Benefit Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	$ 752,000,000	$ 866,000,000
Service cost	14,000,000	17,000,000	$ 16,000,000
Interest cost	32,000,000	34,000,000	38,000,000
Contributions from plan participants	13,000,000	12,000,000
Actuarial loss (gain)	(86,000,000)	(125,000,000)
Benefit payments	(45,000,000)	(43,000,000)
Plan amendments	0	(9,000,000)
Special termination benefits	11,000,000	0
Transfer of liability to other plans	0	0
Ending balance	691,000,000	752,000,000	866,000,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	822,000,000	870,000,000
Actual return on plan assets	79,000,000	(18,000,000)
Employer contributions	1,000,000	1,000,000
Contributions from plan participants	13,000,000	12,000,000
Benefit payments	(45,000,000)	(43,000,000)
Ending balance	870,000,000	822,000,000	870,000,000
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status	179,000,000	70,000,000
Net recorded liability	179,000,000	70,000,000
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]
Noncurrent assets	179,000,000	70,000,000
Current liabilities	0	0
Noncurrent liabilities	0	0
Net recorded (liability) asset	179,000,000	70,000,000
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	14,000,000	17,000,000	16,000,000
Interest cost	32,000,000	34,000,000	38,000,000
Expected return on assets	(56,000,000)	(56,000,000)	(51,000,000)
Amortization of Prior service cost (credit)	(4,000,000)	(7,000,000)	(8,000,000)
Amortization of actuarial loss (gain)	0	0	0
Settlement charge	0	0	0
Special termination benefits	11,000,000	0	0
Regulatory adjustment	3,000,000	12,000,000	5,000,000
Defined Benefit Plan, Net Periodic Benefit Cost, Total	0	0	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]
Net loss (gain)	0	0	0
Prior service (credit) cost	0	0	0
Amortization of actuarial loss	0	0	0
Total recognized in other comprehensive income (loss)	0	0	0
Total recognized in net periodic benefit cost and other comprehensive income (loss)	$ 0	$ 0	$ 0
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.20%	4.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.50%	4.15%	4.95%
Expected return on plan assets	7.00%	7.00%	7.00%
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Effect of 1% increase on total of service and interest cost components of net periodic postretirement health care benefit cost	$ 4,000,000
Effect of 1% decrease on total of service and interest cost components of net periodic postretirement health care benefit cost	(3,000,000)
Effect of 1% increase on the health care component of the accumulated other postretirement benefit obligations	55,000,000
Effect of 1% decrease on the health care component of the accumulated other postretirement benefit obligations	(46,000,000)
Expected employer contributions	1,000,000
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2017	35,000,000
2018	37,000,000
2019	38,000,000
2020	39,000,000
20121	40,000,000
2022-2026	$ 203,000,000
Southern California Gas Company [Member] \| Other Postretirement Benefit Plan [Member] \| Maximum [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	10.00%	10.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	10.00%	10.00%	10.00%
Southern California Gas Company [Member] \| Other Postretirement Benefit Plan [Member] \| Minimum [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	2.00%	2.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	2.00%	2.00%	3.50%
Mobile Gas [Member] \| Other Postretirement Benefit Plan [Member]
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Health care cost trend rate assumed for next year		8.10%	7.75%
Rate to which the cost trend rate is assumed to decline (the ultimate trend)		5.00%	5.00%
Year the rate reaches the ultimate trend		2022	2020
Chilquinta Energia [Member] \| Other Postretirement Benefit Plan [Member]
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Health care cost trend rate assumed for next year	3.00%	3.00%	3.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend)	3.00%	3.00%	3.00%

Defined benefit plan, net periodic benefit cost and other comprehensive income, total.

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Defined benefit plan, special termination benefits.

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Defined benefit plan, regulatory adjustment.

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Defined benefit plan, transfers, benefit obligation.

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The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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After tax net amount of gain (loss) that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases (decreases) in other comprehensive income as they arise.

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No definition available.

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Amount after tax of cost (credit) due to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as a component of net periodic benefit cost.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The amount of gains or losses recognized in net periodic benefit cost.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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Fair value of assets transferred into (out of) a defined benefit pension plan.

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No definition available.

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The interest rate used to adjust for the time value of money for the plan.

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Expected rate of compensation increases (for pay-related plans).

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The interest rate used to adjust for the time value of money.

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Expected Long-Term Rate of Return on Plan Assets
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Expected rate of compensation increases (for pay-related plans).

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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-URI http://asc.fasb.org/extlink&oid=6503904

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The increase in the fair value of plan assets from contributions made by the employer.

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The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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The amount of decrease in the plan benefit obligation attributed to the sale, liquidation, spin-off or other divestiture of a corporate division or subsidiary.

+ References

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The amount of decrease in the plan assets attributed to the sale, liquidation, spin-off or other divestiture of a corporate division or subsidiary.

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- References

No definition available.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

+ References

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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No definition available.

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Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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No definition available.

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Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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No definition available.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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No definition available.

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No definition available.

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If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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Amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6525008

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The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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The amount that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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The amount of increase related to special termination benefits offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. A situation involving termination benefits may also involve a curtailment.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The ultimate trend rate for health care costs.

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- References

No definition available.

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No definition available.

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Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

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- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

+ References

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- Definition

Amount before tax of cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount before tax, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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Amount before tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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