FAIR VALUE MEASUREMENTS 2 (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nuclear decommissioning trusts - equity securities	$ 666		$ 655
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	111		109
Nuclear decomissioning trusts - Municipal debt securities	142		129
Nuclear decommissioning trusts - Other debt securities	212		207
Nuclear decommissioning trusts - Total debt securities	465		445
Total nuclear decommissioning trusts	1,131	[1]	1,100	[1]
Interest rate instruments, assets	52		48
Commodity contracts not subject to rate recovery, assets	26		33
Commodity contracts subject to rate recovery, assets	122		122
Total fair value of assets measured on a recurring basis	1,331		1,303
Interest rate instruments, liabilities	179		155
Commodity contracts not subject to rate recovery, liabilities	4		8
Commodity contracts subject to rate recovery, liabilities	13		16
Total fair value of liabilities measured on a recurring basis	196		179
San Diego Gas and Electric Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nuclear decommissioning trusts - equity securities	666		655
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	111		109
Nuclear decomissioning trusts - Municipal debt securities	142		129
Nuclear decommissioning trusts - Other debt securities	212		207
Nuclear decommissioning trusts - Total debt securities	465		445
Total nuclear decommissioning trusts	1,131	[1]	1,100	[1]
Commodity contracts not subject to rate recovery, assets	1
Commodity contracts subject to rate recovery, assets	119		119
Total fair value of assets measured on a recurring basis	1,251		1,219
Interest rate instruments, liabilities	48		47
Commodity contracts not subject to rate recovery, liabilities	0		0
Commodity contracts subject to rate recovery, liabilities	13		15
Total fair value of liabilities measured on a recurring basis	61		62
Southern California Gas Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity contracts not subject to rate recovery, assets	1
Commodity contracts subject to rate recovery, assets	3		3
Total fair value of assets measured on a recurring basis	4		3
Commodity contracts not subject to rate recovery, liabilities	0		0
Commodity contracts subject to rate recovery, liabilities			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	666		655
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	58		62
Nuclear decomissioning trusts - Municipal debt securities	0		0
Nuclear decommissioning trusts - Other debt securities	0		0
Nuclear decommissioning trusts - Total debt securities	58		62
Total nuclear decommissioning trusts	724	[1]	717	[1]
Interest rate instruments, assets	0		0
Commodity contracts not subject to rate recovery, assets	2		28
Commodity contracts subject to rate recovery, assets	0		0
Total fair value of assets measured on a recurring basis	726		745
Interest rate instruments, liabilities	0		0
Commodity contracts not subject to rate recovery, liabilities	6		3
Commodity contracts subject to rate recovery, liabilities	0		0
Total fair value of liabilities measured on a recurring basis	6		3
Level 1 | San Diego Gas and Electric Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nuclear decommissioning trusts - equity securities	666		655
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	58		62
Nuclear decomissioning trusts - Municipal debt securities	0		0
Nuclear decommissioning trusts - Other debt securities	0		0
Nuclear decommissioning trusts - Total debt securities	58		62
Total nuclear decommissioning trusts	724	[1]	717	[1]
Commodity contracts not subject to rate recovery, assets	0
Commodity contracts subject to rate recovery, assets	0		0
Total fair value of assets measured on a recurring basis	724		717
Interest rate instruments, liabilities	0		0
Commodity contracts not subject to rate recovery, liabilities	1		1
Commodity contracts subject to rate recovery, liabilities	0		0
Total fair value of liabilities measured on a recurring basis	1		1
Level 1 | Southern California Gas Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity contracts not subject to rate recovery, assets	0
Commodity contracts subject to rate recovery, assets	0		0
Total fair value of assets measured on a recurring basis	0		0
Commodity contracts not subject to rate recovery, liabilities	2		2
Commodity contracts subject to rate recovery, liabilities			0
Total fair value of liabilities measured on a recurring basis	2		2
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	53		47
Nuclear decomissioning trusts - Municipal debt securities	142		129
Nuclear decommissioning trusts - Other debt securities	212		207
Nuclear decommissioning trusts - Total debt securities	407		383
Total nuclear decommissioning trusts	407	[1]	383	[1]
Interest rate instruments, assets	52		48
Commodity contracts not subject to rate recovery, assets	8		16
Commodity contracts subject to rate recovery, assets	1		1
Total fair value of assets measured on a recurring basis	468		448
Interest rate instruments, liabilities	179		155
Commodity contracts not subject to rate recovery, liabilities	9		9
Commodity contracts subject to rate recovery, liabilities	67		52
Total fair value of liabilities measured on a recurring basis	255		216
Level 2 | San Diego Gas and Electric Company [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	53		47
Nuclear decomissioning trusts - Municipal debt securities	142		129
Nuclear decommissioning trusts - Other debt securities	212		207
Nuclear decommissioning trusts - Total debt securities	407		383
Total nuclear decommissioning trusts	407	[1]	383	[1]
Commodity contracts not subject to rate recovery, assets	0
Commodity contracts subject to rate recovery, assets	0		0
Total fair value of assets measured on a recurring basis	407		383
Interest rate instruments, liabilities	48		47
Commodity contracts not subject to rate recovery, liabilities	0		0
Commodity contracts subject to rate recovery, liabilities	67		51
Total fair value of liabilities measured on a recurring basis	115		98
Level 2 | Southern California Gas Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity contracts not subject to rate recovery, assets	0
Commodity contracts subject to rate recovery, assets	1		1
Total fair value of assets measured on a recurring basis	1		1
Commodity contracts not subject to rate recovery, liabilities	0		0
Commodity contracts subject to rate recovery, liabilities			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 not subject to rate recovery, assets	0		0
Commodity contracts subject to rate recovery, assets	102		107
Total fair value of assets measured on a recurring basis	102		107
Interest rate instruments, liabilities	0		0
Commodity contracts not subject to rate recovery, 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 | San Diego Gas and Electric Company [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 not subject to rate recovery, assets	0
Commodity contracts subject to rate recovery, assets	102		107
Total fair value of assets measured on a recurring basis	102		107
Interest rate instruments, liabilities	0		0
Commodity contracts not subject to rate recovery, 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 not subject to rate recovery, assets	0
Commodity contracts subject to rate recovery, assets	0		0
Total fair value of assets measured on a recurring basis	0		0
Commodity contracts not subject to rate recovery, liabilities	0		0
Commodity contracts subject to rate recovery, liabilities			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 not subject to rate recovery, assets	16	[2]	(11)	[2]
Commodity contracts subject to rate recovery, assets	19	[2]	14	[2]
Total fair value of assets measured on a recurring basis	35	[2]	3	[2]
Interest rate instruments, liabilities	0	[2]	0	[2]
Commodity contracts not subject to rate recovery, liabilities	(11)	[2]	(4)	[2]
Commodity contracts subject to rate recovery, liabilities	(54)	[2]	(36)	[2]
Total fair value of liabilities measured on a recurring basis	(65)	[2]	(40)	[2]
Collateral Netted [Member] | San Diego Gas and Electric Company [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 not subject to rate recovery, assets	1	[2]
Commodity contracts subject to rate recovery, assets	17	[2]	12	[2]
Total fair value of assets measured on a recurring basis	18	[2]	12	[2]
Interest rate instruments, liabilities	0	[2]	0	[2]
Commodity contracts not subject to rate recovery, liabilities	(1)	[2]	(1)	[2]
Commodity contracts subject to rate recovery, liabilities	(54)	[2]	(36)	[2]
Total fair value of liabilities measured on a recurring basis	(55)	[2]	(37)	[2]
Collateral Netted [Member] | Southern California Gas Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity contracts not subject to rate recovery, assets	1	[2]
Commodity contracts subject to rate recovery, assets	2	[2]	2	[2]
Total fair value of assets measured on a recurring basis	3	[2]	2	[2]
Commodity contracts not subject to rate recovery, liabilities	(2)	[2]	(2)	[2]
Commodity contracts subject to rate recovery, liabilities			0	[2]
Total fair value of liabilities measured on a recurring basis	$ (2)	[2]	$ (2)	[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.