FAIR VALUE MEASUREMENTS 2 (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nuclear decommissioning trusts - equity securities	$ 623		$ 614
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	111		117
Nuclear decomissioning trusts - Municipal debt securities	112		111
Nuclear decommissioning trusts - Other debt securities	178		153
Nuclear decommissioning trusts - Total debt securities	401		381
Total nuclear decommissioning trusts	1,024	[1]	995	[1]
Interest rate instruments, assets	64		56
Commodity contracts subject to rate recovery, assets	137		133
Commodity contracts not subject to rate recovery, assets	20		23
Total fair value of assets measured on a recurring basis	1,245		1,207
Interest rate instruments, liabilities	127		117
Commodity contracts subject to rate recovery, liabilities	15		13
Commodity contracts not subject to rate recovery, liabilities	7		7
Total fair value of liabilities measured on a recurring basis	149		137
San Diego Gas and Electric Company and Subsidiary [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nuclear decommissioning trusts - equity securities	623		614
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	111		117
Nuclear decomissioning trusts - Municipal debt securities	112		111
Nuclear decommissioning trusts - Other debt securities	178		153
Nuclear decommissioning trusts - Total debt securities	401		381
Total nuclear decommissioning trusts	1,024	[1]	995	[1]
Commodity contracts subject to rate recovery, assets	134		130
Commodity contracts not subject to rate recovery, assets	1		1
Total fair value of assets measured on a recurring basis	1,159		1,126
Interest rate instruments, liabilities	53		55
Commodity contracts subject to rate recovery, liabilities	14		12
Total fair value of liabilities measured on a recurring basis	67		67
Southern California Gas Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity contracts subject to rate recovery, assets	3		3
Commodity contracts not subject to rate recovery, assets	2		2
Total fair value of assets measured on a recurring basis	5		5
Commodity contracts subject to rate recovery, liabilities	1		1
Total fair value of liabilities measured on a recurring basis	1		1
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nuclear decommissioning trusts - equity securities	623		614
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	55		59
Nuclear decomissioning trusts - Municipal debt securities	0		0
Nuclear decommissioning trusts - Other debt securities	0		0
Nuclear decommissioning trusts - Total debt securities	55		59
Total nuclear decommissioning trusts	678	[1]	673	[1]
Interest rate instruments, assets	0		0
Commodity contracts subject to rate recovery, assets	7		2
Commodity contracts not subject to rate recovery, assets	1		1
Total fair value of assets measured on a recurring basis	686		676
Interest rate instruments, liabilities	0		0
Commodity contracts subject to rate recovery, liabilities	0		0
Commodity contracts not subject to rate recovery, liabilities	1		4
Total fair value of liabilities measured on a recurring basis	1		4
Level 1 | San Diego Gas and Electric Company and Subsidiary [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nuclear decommissioning trusts - equity securities	623		614
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	55		59
Nuclear decomissioning trusts - Municipal debt securities	0		0
Nuclear decommissioning trusts - Other debt securities	0		0
Nuclear decommissioning trusts - Total debt securities	55		59
Total nuclear decommissioning trusts	678	[1]	673	[1]
Commodity contracts subject to rate recovery, assets	7		1
Commodity contracts not subject to rate recovery, assets	0		0
Total fair value of assets measured on a recurring basis	685		674
Interest rate instruments, liabilities	0		0
Commodity contracts subject to rate recovery, liabilities	0		0
Total fair value of liabilities measured on a recurring basis	0		0
Level 1 | Southern California Gas Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity contracts subject to rate recovery, assets	0		1
Commodity contracts not subject to rate recovery, assets	0		0
Total fair value of assets measured on a recurring basis	0		1
Commodity contracts subject to rate recovery, liabilities	0		0
Total fair value of liabilities measured on a recurring basis	0		0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nuclear decommissioning trusts - equity securities	0		0
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	56		58
Nuclear decomissioning trusts - Municipal debt securities	112		111
Nuclear decommissioning trusts - Other debt securities	178		153
Nuclear decommissioning trusts - Total debt securities	346		322
Total nuclear decommissioning trusts	346	[1]	322	[1]
Interest rate instruments, assets	64		56
Commodity contracts subject to rate recovery, assets	4		1
Commodity contracts not subject to rate recovery, assets	4		5
Total fair value of assets measured on a recurring basis	418		384
Interest rate instruments, liabilities	127		117
Commodity contracts subject to rate recovery, liabilities	15		13
Commodity contracts not subject to rate recovery, liabilities	8		8
Total fair value of liabilities measured on a recurring basis	150		138
Level 2 | San Diego Gas and Electric Company and Subsidiary [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nuclear decommissioning trusts - equity securities	0		0
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	56		58
Nuclear decomissioning trusts - Municipal debt securities	112		111
Nuclear decommissioning trusts - Other debt securities	178		153
Nuclear decommissioning trusts - Total debt securities	346		322
Total nuclear decommissioning trusts	346	[1]	322	[1]
Commodity contracts subject to rate recovery, assets	3		1
Commodity contracts not subject to rate recovery, assets	0		0
Total fair value of assets measured on a recurring basis	349		323
Interest rate instruments, liabilities	53		55
Commodity contracts subject to rate recovery, liabilities	14		12
Total fair value of liabilities measured on a recurring basis	67		67
Level 2 | Southern California Gas Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity contracts subject to rate recovery, assets	1		0
Commodity contracts not subject to rate recovery, assets	0		0
Total fair value of assets measured on a recurring basis	1		0
Commodity contracts subject to rate recovery, liabilities	1		1
Total fair value of liabilities measured on a recurring basis	1		1
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nuclear decommissioning trusts - equity securities	0		0
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	0		0
Nuclear decomissioning trusts - Municipal debt securities	0		0
Nuclear decommissioning trusts - Other debt securities	0		0
Nuclear decommissioning trusts - Total debt securities	0		0
Total nuclear decommissioning trusts	0	[1]	0	[1]
Interest rate instruments, assets	0		0
Commodity contracts subject to rate recovery, assets	95		99
Commodity contracts not subject to rate recovery, assets	0		0
Total fair value of assets measured on a recurring basis	95		99
Interest rate instruments, liabilities	0		0
Commodity contracts subject to rate recovery, liabilities	0		0
Commodity contracts not subject to rate recovery, liabilities	0		0
Total fair value of liabilities measured on a recurring basis	0		0
Level 3 | San Diego Gas and Electric Company and Subsidiary [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nuclear decommissioning trusts - equity securities	0		0
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	0		0
Nuclear decomissioning trusts - Municipal debt securities	0		0
Nuclear decommissioning trusts - Other debt securities	0		0
Nuclear decommissioning trusts - Total debt securities	0		0
Total nuclear decommissioning trusts	0	[1]	0	[1]
Commodity contracts subject to rate recovery, assets	95		99
Commodity contracts not subject to rate recovery, assets	0		0
Total fair value of assets measured on a recurring basis	95		99
Interest rate instruments, liabilities	0		0
Commodity contracts subject to rate recovery, liabilities	0		0
Total fair value of liabilities measured on a recurring basis	0		0
Level 3 | Southern California Gas Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity contracts subject to rate recovery, assets	0		0
Commodity contracts not subject to rate recovery, assets	0		0
Total fair value of assets measured on a recurring basis	0		0
Commodity contracts subject to rate recovery, liabilities	0		0
Total fair value of liabilities measured on a recurring basis	0		0
Collateral Netted [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nuclear decommissioning trusts - equity securities	0	[2]	0	[2]
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	0	[2]	0	[2]
Nuclear decomissioning trusts - Municipal debt securities	0	[2]	0	[2]
Nuclear decommissioning trusts - Other debt securities	0	[2]	0	[2]
Nuclear decommissioning trusts - Total debt securities	0	[2]	0	[2]
Total nuclear decommissioning trusts	0	[1],[2]	0	[1],[2]
Interest rate instruments, assets	0	[2]	0	[2]
Commodity contracts subject to rate recovery, assets	31	[2]	31	[2]
Commodity contracts not subject to rate recovery, assets	15	[2]	17	[2]
Total fair value of assets measured on a recurring basis	46	[2]	48	[2]
Interest rate instruments, liabilities	0	[2]	0	[2]
Commodity contracts subject to rate recovery, liabilities	0	[2]	0	[2]
Commodity contracts not subject to rate recovery, liabilities	(2)	[2]	(5)	[2]
Total fair value of liabilities measured on a recurring basis	(2)	[2]	(5)	[2]
Collateral Netted [Member] | San Diego Gas and Electric Company and Subsidiary [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nuclear decommissioning trusts - equity securities	0	[2]	0	[2]
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	0	[2]	0	[2]
Nuclear decomissioning trusts - Municipal debt securities	0	[2]	0	[2]
Nuclear decommissioning trusts - Other debt securities	0	[2]	0	[2]
Nuclear decommissioning trusts - Total debt securities	0	[2]	0	[2]
Total nuclear decommissioning trusts	0	[1],[2]	0	[1],[2]
Commodity contracts subject to rate recovery, assets	29	[2]	29	[2]
Commodity contracts not subject to rate recovery, assets	1	[2]	1	[2]
Total fair value of assets measured on a recurring basis	30	[2]	30	[2]
Interest rate instruments, liabilities	0	[2]	0	[2]
Commodity contracts subject to rate recovery, liabilities	0	[2]	0	[2]
Total fair value of liabilities measured on a recurring basis	0	[2]	0	[2]
Collateral Netted [Member] | Southern California Gas Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity contracts subject to rate recovery, assets	2	[2]	2	[2]
Commodity contracts not subject to rate recovery, assets	2	[2]	2	[2]
Total fair value of assets measured on a recurring basis	4	[2]	4	[2]
Commodity contracts subject to rate recovery, liabilities	0	[2]	0	[2]
Total fair value of liabilities measured on a recurring basis	$ 0	[2]	$ 0	[2]

[1] Excludes cash balances and cash equivalents.

[2] Includes the effect of the contractual ability to settle contracts under master netting agreements and with cash collateral, as well as cash collateral not offset.