FAIR VALUE MEASUREMENTS 2 (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nuclear decommissioning trusts - equity securities	$ 637		$ 614
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	103		117
Nuclear decomissioning trusts - Municipal debt securities	121		111
Nuclear decommissioning trusts - Other debt securities	200		153
Nuclear decommissioning trusts - Total debt securities	424		381
Total nuclear decommissioning trusts	1,061	[1]	995	[1]
Interest rate instruments, assets	51		56
Commodity contracts subject to rate recovery, assets	120		133
Commodity contracts not subject to rate recovery, assets	26		23
Total fair value of assets measured on a recurring basis	1,258		1,207
Interest rate instruments, liabilities	121		117
Commodity contracts subject to rate recovery, liabilities	10		13
Commodity contracts not subject to rate recovery, liabilities	3		7
Total fair value of liabilities measured on a recurring basis	134		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	637		614
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	103		117
Nuclear decomissioning trusts - Municipal debt securities	121		111
Nuclear decommissioning trusts - Other debt securities	200		153
Nuclear decommissioning trusts - Total debt securities	424		381
Total nuclear decommissioning trusts	1,061	[1]	995	[1]
Commodity contracts subject to rate recovery, assets	117		130
Commodity contracts not subject to rate recovery, assets	1		1
Total fair value of assets measured on a recurring basis	1,179		1,126
Interest rate instruments, liabilities	48		55
Commodity contracts subject to rate recovery, liabilities	10		12
Total fair value of liabilities measured on a recurring basis	58		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	2		3
Commodity contracts not subject to rate recovery, assets	3		2
Total fair value of assets measured on a recurring basis	5		5
Commodity contracts subject to rate recovery, liabilities	0		1
Total fair value of liabilities measured on a recurring basis	0		1
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nuclear decommissioning trusts - equity securities	637		614
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	56		59
Nuclear decomissioning trusts - Municipal debt securities	0		0
Nuclear decommissioning trusts - Other debt securities	0		0
Nuclear decommissioning trusts - Total debt securities	56		59
Total nuclear decommissioning trusts	693	[1]	673	[1]
Interest rate instruments, assets	0		0
Commodity contracts subject to rate recovery, assets	0		2
Commodity contracts not subject to rate recovery, assets	7		1
Total fair value of assets measured on a recurring basis	700		676
Interest rate instruments, liabilities	0		0
Commodity contracts subject to rate recovery, liabilities	3		0
Commodity contracts not subject to rate recovery, liabilities	2		4
Total fair value of liabilities measured on a recurring basis	5		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	637		614
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	56		59
Nuclear decomissioning trusts - Municipal debt securities	0		0
Nuclear decommissioning trusts - Other debt securities	0		0
Nuclear decommissioning trusts - Total debt securities	56		59
Total nuclear decommissioning trusts	693	[1]	673	[1]
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	693		674
Interest rate instruments, liabilities	0		0
Commodity contracts subject to rate recovery, liabilities	3		0
Total fair value of liabilities measured on a recurring basis	3		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	47		58
Nuclear decomissioning trusts - Municipal debt securities	121		111
Nuclear decommissioning trusts - Other debt securities	200		153
Nuclear decommissioning trusts - Total debt securities	368		322
Total nuclear decommissioning trusts	368	[1]	322	[1]
Interest rate instruments, assets	51		56
Commodity contracts subject to rate recovery, assets	3		1
Commodity contracts not subject to rate recovery, assets	4		5
Total fair value of assets measured on a recurring basis	426		384
Interest rate instruments, liabilities	121		117
Commodity contracts subject to rate recovery, liabilities	10		13
Commodity contracts not subject to rate recovery, liabilities	3		8
Total fair value of liabilities measured on a recurring basis	134		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	47		58
Nuclear decomissioning trusts - Municipal debt securities	121		111
Nuclear decommissioning trusts - Other debt securities	200		153
Nuclear decommissioning trusts - Total debt securities	368		322
Total nuclear decommissioning trusts	368	[1]	322	[1]
Commodity contracts subject to rate recovery, assets	2		1
Commodity contracts not subject to rate recovery, assets	0		0
Total fair value of assets measured on a recurring basis	370		323
Interest rate instruments, liabilities	48		55
Commodity contracts subject to rate recovery, liabilities	10		12
Total fair value of liabilities measured on a recurring basis	58		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	0		0
Commodity contracts not subject to rate recovery, assets	1		0
Total fair value of assets measured on a recurring basis	1		0
Commodity contracts subject to rate recovery, liabilities	0		1
Total fair value of liabilities measured on a recurring basis	0		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	87		99
Commodity contracts not subject to rate recovery, assets	0		0
Total fair value of assets measured on a recurring basis	87		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	87		99
Commodity contracts not subject to rate recovery, assets	0		0
Total fair value of assets measured on a recurring basis	87		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	30	[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	45	[2]	48	[2]
Interest rate instruments, liabilities	0	[2]	0	[2]
Commodity contracts subject to rate recovery, liabilities	(3)	[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	(5)	[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	28	[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	29	[2]	30	[2]
Interest rate instruments, liabilities	0	[2]	0	[2]
Commodity contracts subject to rate recovery, liabilities	(3)	[2]	0	[2]
Total fair value of liabilities measured on a recurring basis	(3)	[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.