CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 954	$ 475	[1]
Restricted cash	89	46	[1]
Other accounts and notes receivable	154	153	[1]
Trade accounts receivable	1,007	1,146	[1]
Inventories	357	408	[1]
Income taxes receivable	129	56	[1]
Deferred income taxes, net current assets	76	148	[1]
Regulatory balancing accounts, undercollected	325	395	[1]
Regulatory assets	190	62	[1]
Fixed-price contracts and other derivatives, current assets	81	95	[1]
Assets Held For Sale Current		296	[1]
U.S. Treasury grants receivable	164	258	[1]
Other current assets	135	157	[1]
Total current assets	3,661	3,695	[1]
Investments And Other Assets [Abstract]
Restricted cash, noncurrent	22	22	[1]
Regulatory assets arising from pension and other postretirement benefit obligations	1,170	1,151	[1]
Regulatory assets arising from wildfire litigation costs	352	364	[1]
Other regulatory assets	1,872	1,227	[1]
Nuclear decommissioning trusts	938	908	[1]
Other investments	1,466	1,516	[1]
Goodwill	1,042	1,111	[1]
Other intangible assets	431	436	[1]
Sundry	895	878	[1]
Total investments and other assets	8,188	7,613	[1]
Property, plant and equipment:
Property, plant and equipment	33,728	33,528	[1]
Less accumulated depreciation and amortization	(8,557)	(8,337)	[1]
Property, plant and equipment, net	25,171	25,191	[1]
Total assets	37,020	36,499	[1]
Current liabilities:
Short-term debt	510	546	[1]
Accounts payable - trade	959	976	[1]
Accounts payable - other	114	134	[1]
Dividends and interest payable	271	266	[1]
Accrued compensation and benefits	235	337	[1]
Regulatory balancing accounts, overcollected	290	141	[1]
Current portion of long-term debt	1,540	725	[1]
Fixed-price contracts and other derivatives, current liabilities	71	77	[1]
Customer deposits	142	143	[1]
Reserve for wildfire litigation (Note 10)	182	305	[1]
Other current liabilities	411	608	[1]
Total current liabilities	4,725	4,258	[1]
Long-term debt	10,530	11,621	[1]
Deferred Credits And Other Liabilities [Abstract]
Customer advances for construction	140	144	[1]
Pension and other postretirement benefit obligations, net of plan assets	1,471	1,456	[1]
Deferred income taxes, net noncurrent liabilities	2,389	2,100	[1]
Deferred investment tax credits	44	46	[1]
Regulatory liabilities arising from removal obligations	2,842	2,720	[1]
Asset retirement obligations	1,949	2,033	[1]
Fixed-price contracts and other derivatives, noncurrent liabilities	237	252	[1]
Deferred credits and other	1,066	1,107	[1]
Total deferred credits and other liabilities	10,138	9,858	[1]
Contingently redeemable preferred stock of subsidiary	79	79	[1]
Equity:
Common stock	2,366	2,217	[1]
Retained earnings	8,557	8,441	[1]
Accumulated other comprehensive income (loss)	(219)	(376)	[1]
Total shareholders' equity	10,704	10,282	[1]
Preferred stock of subsidiaries	20	20	[1]
Other noncontrolling interests	824	381	[1]
Total equity	11,548	10,683	[1]
Total liabilities and equity	37,020	36,499	[1]
San Diego Gas and Electric Company and Subsidiary [Member]
Current assets:
Cash and cash equivalents	13	87	[1]
Restricted cash	8	10	[1]
Other accounts and notes receivable	26	21	[1]
Trade accounts receivable	268	252	[1]
Inventories	73	82	[1]
Due from unconsolidated affiliates	1	39	[1]
Income taxes receivable		35	[1]
Deferred income taxes, net current assets	29
Regulatory balancing accounts, net	325	395	[1]
Regulatory assets arising from fixed-price contracts and other derivatives - current	39	39	[1]
Regulatory assets	140	10	[1]
Fixed-price contracts and other derivatives, current assets	25	41	[1]
Other current assets	32	76	[1]
Total current assets	979	1,087	[1]
Investments And Other Assets [Abstract]
Restricted cash, noncurrent	22	22	[1]
Deferred taxes recoverable in rates	760	718	[1]
Regulatory assets arising from fixed-price contracts and other derivatives - noncurrent	104	110	[1]
Regulatory assets arising from pension and other postretirement benefit obligations	299	303	[1]
Regulatory assets arising from wildfire litigation costs	352	364	[1]
Other regulatory assets	740	252	[1]
Nuclear decommissioning trusts	938	908	[1]
Sundry	147	117	[1]
Total investments and other assets	3,362	2,794	[1]
Property, plant and equipment:
Property, plant and equipment	13,862	14,124	[1]
Less accumulated depreciation and amortization	(3,307)	(3,261)	[1]
Property, plant and equipment, net	10,555	10,863	[1]
Total assets	14,896	14,744	[1]
Current liabilities:
Short-term debt	53
Accounts payable - trade	296	300	[1]
Due to unconsolidated affiliates	19	19	[1]
Income taxes payable	28
Deferred income taxes, net current liabilities		26	[1]
Dividends and interest payable	37	36	[1]
Accrued compensation and benefits	64	129	[1]
Current portion of long-term debt	146	16	[1]
Fixed-price contracts and other derivatives, current liabilities	47	56	[1]
Customer deposits	59	60	[1]
Construction deposits by large customers	51	51	[1]
Reserve for wildfire litigation (Note 10)	182	305	[1]
Other current liabilities	132	106	[1]
Total current liabilities	1,114	1,104	[1]
Long-term debt	4,155	4,292	[1]
Deferred Credits And Other Liabilities [Abstract]
Customer advances for construction	20	17	[1]
Pension and other postretirement benefit obligations, net of plan assets	338	340	[1]
Deferred income taxes, net noncurrent liabilities	1,768	1,636	[1]
Deferred investment tax credits	25	25	[1]
Regulatory liabilities arising from removal obligations	1,641	1,603	[1]
Asset retirement obligations	726	733	[1]
Fixed-price contracts and other derivatives, noncurrent liabilities	183	209	[1]
Deferred credits and other	380	408	[1]
Total deferred credits and other liabilities	5,081	4,971	[1]
Contingently redeemable preferred stock	79	79	[1]
Equity:
Common stock	1,338	1,338	[1]
Retained earnings	3,051	2,895	[1]
Accumulated other comprehensive income (loss)	(10)	(11)	[1]
Total shareholders' equity	4,379	4,222	[1]
Other noncontrolling interests	88	76	[1]
Total equity	4,467	4,298	[1]
Total liabilities and equity	14,896	14,744	[1]
Southern California Gas Company [Member]
Current assets:
Cash and cash equivalents	20	83	[1]
Other accounts and notes receivable	56	51	[1]
Trade accounts receivable	373	539	[1]
Inventories	69	151	[1]
Due from unconsolidated affiliates	259	24	[1]
Income taxes receivable	139	104	[1]
Deferred income taxes, net current assets		3	[1]
Regulatory assets	3	4	[1]
Other current assets	48	35	[1]
Total current assets	967	994	[1]
Investments And Other Assets [Abstract]
Regulatory assets arising from pension and other postretirement benefit obligations	858	835	[1]
Other regulatory assets	269	148	[1]
Sundry	118	77	[1]
Total investments and other assets	1,245	1,060	[1]
Property, plant and equipment:
Property, plant and equipment	11,389	11,187	[1]
Less accumulated depreciation and amortization	(4,240)	(4,170)	[1]
Property, plant and equipment, net	7,149	7,017	[1]
Total assets	9,361	9,071	[1]
Current liabilities:
Accounts payable - trade	353	383	[1]
Accounts payable - other	66	82	[1]
Due to unconsolidated affiliates		37	[1]
Deferred income taxes, net current liabilities	31
Accrued compensation and benefits	103	116	[1]
Regulatory balancing accounts, net credit	290	141	[1]
Current portion of long-term debt	252	4	[1]
Customer deposits	75	76	[1]
Other current liabilities	101	124	[1]
Total current liabilities	1,271	963	[1]
Long-term debt	1,159	1,409	[1]
Deferred Credits And Other Liabilities [Abstract]
Customer advances for construction	106	111	[1]
Pension and other postretirement benefit obligations, net of plan assets	877	855	[1]
Deferred income taxes, net noncurrent liabilities	935	881	[1]
Deferred investment tax credits	19	20	[1]
Regulatory liabilities arising from removal obligations	1,187	1,103	[1]
Asset retirement obligations	1,158	1,238	[1]
Deferred credits and other	299	256	[1]
Total deferred credits and other liabilities	4,581	4,464	[1]
Equity:
Preferred stock	22	22	[1]
Common stock	866	866	[1]
Retained earnings	1,479	1,365	[1]
Accumulated other comprehensive income (loss)	(17)	(18)	[1]
Total shareholders' equity	2,350	2,235	[1]
Total equity	2,350	2,235	[1]
Total liabilities and equity	$ 9,361	$ 9,071	[1]

[1] Derived from audited financial statements.