OTHER FINANCIAL DATA - COMPREHENSIVE INCOME AND EQUITY 3 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Reclassifications From Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified From Accumulated Other Comprehensive Income Loss	$ 12		$ 5
Interest Expense [Member] | Interest Rate Instruments [Member]
Reclassifications From Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified From Accumulated Other Comprehensive Income Loss	3		3
Interest Expense [Member] | Interest Rate Instruments [Member] | San Diego Gas and Electric Company and Subsidiary [Member]
Reclassifications From Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified From Accumulated Other Comprehensive Income Loss	3		2
Cost of Natural Gas, Electric Fuel and Purchased Power [Member] | Commodity Contracts Not Subject To Rate Recovery [Member]
Reclassifications From Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified From Accumulated Other Comprehensive Income Loss	10		0
Equity Earnings Before Income Tax [Member] | Interest Rate Instruments [Member]
Reclassifications From Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified From Accumulated Other Comprehensive Income Loss	3		2
Income Before Tax [Member] | Interest Rate Instruments [Member]
Reclassifications From Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified From Accumulated Other Comprehensive Income Loss	18		5
Income Before Tax [Member] | Amortization of Actuarial Loss [Member]
Reclassifications From Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified From Accumulated Other Comprehensive Income Loss	5	[1]	5	[1]
Income Tax Expense [Member] | Interest Rate Instruments [Member]
Reclassifications From Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified From Accumulated Other Comprehensive Income Loss	(6)		(1)
Income Tax Expense [Member] | Amortization of Actuarial Loss [Member]
Reclassifications From Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified From Accumulated Other Comprehensive Income Loss	(2)	[1]	(2)	[1]
Gain On Sale Of Assets [Member] | Interest Rate Instruments [Member]
Reclassifications From Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified From Accumulated Other Comprehensive Income Loss	2		0
Income After Tax [Member] | Interest Rate Instruments [Member]
Reclassifications From Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified From Accumulated Other Comprehensive Income Loss	12		4
Income After Tax [Member] | Amortization of Actuarial Loss [Member]
Reclassifications From Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified From Accumulated Other Comprehensive Income Loss	3	[1]	3	[1]
Earnings Attributable To Noncontrolling Interests [Member] | Interest Rate Instruments [Member]
Reclassifications From Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified From Accumulated Other Comprehensive Income Loss	(3)		(2)
Earnings Attributable To Noncontrolling Interests [Member] | Interest Rate Instruments [Member] | San Diego Gas and Electric Company and Subsidiary [Member]
Reclassifications From Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified From Accumulated Other Comprehensive Income Loss	(3)		(2)
Total [Member] | San Diego Gas and Electric Company and Subsidiary [Member]
Reclassifications From Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified From Accumulated Other Comprehensive Income Loss	0		0
Total [Member] | Interest Rate Instruments [Member]
Reclassifications From Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified From Accumulated Other Comprehensive Income Loss	$ 9		$ 2

[1] Amounts are included in the computation of net periodic benefit cost (see "Pension and Other Postretirement Benefits" above).