FAIR VALUE MEASUREMENTS 2 (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nuclear decommissioning trusts - equity securities		$ 665	$ 655
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies		98	109
Nuclear decomissioning trusts - Municipal debt securities		152	129
Nuclear decommissioning trusts - Other debt securities		209	207
Nuclear decommissioning trusts - Total debt securities		459	445
Total nuclear decommissioning trusts	[1]	1,124	1,100
Interest rate instruments, assets		43	48
Commodity contracts not subject to rate recovery, assets		36	33
Commodity contracts subject to rate recovery, assets		115	122
Total fair value of assets measured on a recurring basis		1,318	1,303
Interest rate instruments, liabilities		172	155
Commodity contracts not subject to rate recovery, liabilities		2	8
Commodity contracts subject to rate recovery, liabilities		57	16
Total fair value of liabilities measured on a recurring basis		231	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		665	655
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies		98	109
Nuclear decomissioning trusts - Municipal debt securities		152	129
Nuclear decommissioning trusts - Other debt securities		209	207
Nuclear decommissioning trusts - Total debt securities		459	445
Total nuclear decommissioning trusts	[1]	1,124	1,100
Commodity contracts not subject to rate recovery, assets		1
Commodity contracts subject to rate recovery, assets		113	119
Total fair value of assets measured on a recurring basis		1,238	1,219
Interest rate instruments, liabilities		43	47
Commodity contracts not subject to rate recovery, liabilities		0	0
Commodity contracts subject to rate recovery, liabilities		57	15
Total fair value of liabilities measured on a recurring basis		100	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		2
Commodity contracts subject to rate recovery, assets		2	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		665	655
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies		50	62
Nuclear decomissioning trusts - Municipal debt securities		0	0
Nuclear decommissioning trusts - Other debt securities		0	0
Nuclear decommissioning trusts - Total debt securities		50	62
Total nuclear decommissioning trusts	[1]	715	717
Interest rate instruments, assets		0	0
Commodity contracts not subject to rate recovery, assets		6	28
Commodity contracts subject to rate recovery, assets		0	0
Total fair value of assets measured on a recurring basis		721	745
Interest rate instruments, liabilities		0	0
Commodity contracts not subject to rate recovery, liabilities		4	3
Commodity contracts subject to rate recovery, liabilities		0	0
Total fair value of liabilities measured on a recurring basis		4	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		665	655
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies		50	62
Nuclear decomissioning trusts - Municipal debt securities		0	0
Nuclear decommissioning trusts - Other debt securities		0	0
Nuclear decommissioning trusts - Total debt securities		50	62
Total nuclear decommissioning trusts	[1]	715	717
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		715	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		1	2
Commodity contracts subject to rate recovery, liabilities			0
Total fair value of liabilities measured on a recurring basis		1	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		48	47
Nuclear decomissioning trusts - Municipal debt securities		152	129
Nuclear decommissioning trusts - Other debt securities		209	207
Nuclear decommissioning trusts - Total debt securities		409	383
Total nuclear decommissioning trusts	[1]	409	383
Interest rate instruments, assets		43	48
Commodity contracts not subject to rate recovery, assets		13	16
Commodity contracts subject to rate recovery, assets		1	1
Total fair value of assets measured on a recurring basis		466	448
Interest rate instruments, liabilities		172	155
Commodity contracts not subject to rate recovery, liabilities		4	9
Commodity contracts subject to rate recovery, liabilities		54	52
Total fair value of liabilities measured on a recurring basis		230	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		48	47
Nuclear decomissioning trusts - Municipal debt securities		152	129
Nuclear decommissioning trusts - Other debt securities		209	207
Nuclear decommissioning trusts - Total debt securities		409	383
Total nuclear decommissioning trusts	[1]	409	383
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		409	383
Interest rate instruments, liabilities		43	47
Commodity contracts not subject to rate recovery, liabilities		0	0
Commodity contracts subject to rate recovery, liabilities		54	51
Total fair value of liabilities measured on a recurring basis		97	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	[1]	0	0
Interest rate instruments, assets		0	0
Commodity contracts not subject to rate recovery, assets		0	0
Commodity contracts subject to rate recovery, assets		87	107
Total fair value of assets measured on a recurring basis		87	107
Interest rate instruments, liabilities		0	0
Commodity contracts not subject to rate recovery, liabilities		0	0
Commodity contracts subject to rate recovery, liabilities		45	0
Total fair value of liabilities measured on a recurring basis		45	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	[1]	0	0
Commodity contracts not subject to rate recovery, assets		0
Commodity contracts subject to rate recovery, assets		87	107
Total fair value of assets measured on a recurring basis		87	107
Interest rate instruments, liabilities		0	0
Commodity contracts not subject to rate recovery, liabilities		0	0
Commodity contracts subject to rate recovery, liabilities		45	0
Total fair value of liabilities measured on a recurring basis		45	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	[2]	0	0
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	[2]	0	0
Nuclear decomissioning trusts - Municipal debt securities	[2]	0	0
Nuclear decommissioning trusts - Other debt securities	[2]	0	0
Nuclear decommissioning trusts - Total debt securities	[2]	0	0
Total nuclear decommissioning trusts	[1],[2]	0	0
Interest rate instruments, assets	[2]	0	0
Commodity contracts not subject to rate recovery, assets	[2]	17	(11)
Commodity contracts subject to rate recovery, assets	[2]	27	14
Total fair value of assets measured on a recurring basis	[2]	44	3
Interest rate instruments, liabilities	[2]	0	0
Commodity contracts not subject to rate recovery, liabilities	[2]	(6)	(4)
Commodity contracts subject to rate recovery, liabilities	[2]	(42)	(36)
Total fair value of liabilities measured on a recurring basis	[2]	(48)	(40)
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	[2]	0	0
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	[2]	0	0
Nuclear decomissioning trusts - Municipal debt securities	[2]	0	0
Nuclear decommissioning trusts - Other debt securities	[2]	0	0
Nuclear decommissioning trusts - Total debt securities	[2]	0	0
Total nuclear decommissioning trusts	[1],[2]	0	0
Commodity contracts not subject to rate recovery, assets	[2]	1
Commodity contracts subject to rate recovery, assets	[2]	26	12
Total fair value of assets measured on a recurring basis	[2]	27	12
Interest rate instruments, liabilities	[2]	0	0
Commodity contracts not subject to rate recovery, liabilities	[2]	(1)	(1)
Commodity contracts subject to rate recovery, liabilities	[2]	(42)	(36)
Total fair value of liabilities measured on a recurring basis	[2]	(43)	(37)
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	[2]	2
Commodity contracts subject to rate recovery, assets	[2]	1	2
Total fair value of assets measured on a recurring basis	[2]	3	2
Commodity contracts not subject to rate recovery, liabilities	[2]	(1)	(2)
Commodity contracts subject to rate recovery, liabilities	[2]		0
Total fair value of liabilities measured on a recurring basis	[2]	$ (1)	$ (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.