CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 1,471	$ 475	[1]
Restricted cash	57	46	[1]
Other accounts and notes receivable	198	153	[1]
Trade accounts receivable	1,131	1,146	[1]
Inventories	270	408	[1]
Income taxes receivable	73	56	[1]
Deferred income taxes, net current assets	28	148	[1]
Regulatory balancing accounts, undercollected	411	395	[1]
Regulatory assets	42	62	[1]
Fixed-price contracts and other derivatives, current assets	88	95	[1]
Assets Held For Sale Current		296	[1]
U.S. Treasury grants receivable	236	258	[1]
Other current assets	118	157	[1]
Total current assets	4,123	3,695	[1]
Investments And Other Assets [Abstract]
Restricted cash, noncurrent	19	22	[1]
Regulatory assets arising from pension and other postretirement benefit obligations	1,167	1,151	[1]
Regulatory assets arising from wildfire litigation costs	360	364	[1]
Other regulatory assets	1,233	1,227	[1]
Nuclear decommissioning trusts	952	908	[1]
Other investments	1,519	1,516	[1]
Goodwill	1,113	1,111	[1]
Other intangible assets	434	436	[1]
Sundry	895	878	[1]
Total investments and other assets	7,692	7,613	[1]
Property, plant and equipment:
Property, plant and equipment	34,011	33,528	[1]
Less accumulated depreciation and amortization	(8,553)	(8,337)	[1]
Property, plant and equipment, net	25,458	25,191	[1]
Total assets	37,273	36,499	[1]
Current liabilities:
Short-term debt	762	546	[1]
Accounts payable - trade	874	976	[1]
Accounts payable - other	116	134	[1]
Dividends and interest payable	323	266	[1]
Accrued compensation and benefits	217	337	[1]
Regulatory balancing accounts, overcollected	294	141	[1]
Current portion of long-term debt	1,381	725	[1]
Fixed-price contracts and other derivatives, current liabilities	71	77	[1]
Customer deposits	142	143	[1]
Reserve for wildfire litigation (Note 10)	221	305	[1]
Other current liabilities	788	608	[1]
Total current liabilities	5,189	4,258	[1]
Long-term debt	10,680	11,621	[1]
Deferred Credits And Other Liabilities [Abstract]
Customer advances for construction	139	144	[1]
Pension and other postretirement benefit obligations, net of plan assets	1,466	1,456	[1]
Deferred income taxes, net noncurrent liabilities	2,248	2,100	[1]
Deferred investment tax credits	46	46	[1]
Regulatory liabilities arising from removal obligations	2,783	2,720	[1]
Asset retirement obligations	2,056	2,033	[1]
Noncurrent reserve for wildfire litigation (Note 10)	45	22	[1]
Fixed-price contracts and other derivatives, noncurrent liabilities	254	252	[1]
Deferred credits and other	1,027	1,085	[1]
Total deferred credits and other liabilities	10,064	9,858	[1]
Contingently redeemable preferred stock of subsidiary	79	79	[1]
Equity:
Common stock	2,334	2,217	[1]
Retained earnings	8,466	8,441	[1]
Accumulated other comprehensive income (loss)	(377)	(376)	[1]
Total shareholders' equity	10,423	10,282	[1]
Preferred stock of subsidiaries	20	20	[1]
Other noncontrolling interests	818	381	[1]
Total equity	11,261	10,683	[1]
Total liabilities and equity	37,273	36,499	[1]
San Diego Gas and Electric Company and Subsidiary [Member]
Current assets:
Cash and cash equivalents	106	87	[1]
Restricted cash	15	10	[1]
Other accounts and notes receivable	34	21	[1]
Trade accounts receivable	259	252	[1]
Inventories	81	82	[1]
Due from unconsolidated affiliates	1	39	[1]
Income taxes receivable		35	[1]
Deferred income taxes, net current assets	12
Regulatory balancing accounts, net	411	395	[1]
Regulatory assets arising from fixed-price contracts and other derivatives - current	22	39	[1]
Regulatory assets	10	10	[1]
Fixed-price contracts and other derivatives, current assets	45	41	[1]
Other current assets	43	76	[1]
Total current assets	1,039	1,087	[1]
Investments And Other Assets [Abstract]
Restricted cash, noncurrent	19	22	[1]
Deferred taxes recoverable in rates	727	718	[1]
Regulatory assets arising from fixed-price contracts and other derivatives - noncurrent	106	110	[1]
Regulatory assets arising from pension and other postretirement benefit obligations	307	303	[1]
Regulatory assets arising from wildfire litigation costs	360	364	[1]
Other regulatory assets	243	252	[1]
Nuclear decommissioning trusts	952	908	[1]
Sundry	143	117	[1]
Total investments and other assets	2,857	2,794	[1]
Property, plant and equipment:
Property, plant and equipment	14,299	14,124	[1]
Less accumulated depreciation and amortization	(3,343)	(3,261)	[1]
Property, plant and equipment, net	10,956	10,863	[1]
Total assets	14,852	14,744	[1]
Current liabilities:
Accounts payable - trade	239	300	[1]
Due to unconsolidated affiliates	35	19	[1]
Income taxes payable	33
Deferred income taxes, net current liabilities		26	[1]
Dividends and interest payable	55	36	[1]
Accrued compensation and benefits	63	129	[1]
Current portion of long-term debt	16	16	[1]
Fixed-price contracts and other derivatives, current liabilities	47	56	[1]
Customer deposits	58	60	[1]
Construction deposits by large customers	51	51	[1]
Reserve for wildfire litigation (Note 10)	221	305	[1]
Other current liabilities	170	106	[1]
Total current liabilities	988	1,104	[1]
Long-term debt	4,289	4,292	[1]
Deferred Credits And Other Liabilities [Abstract]
Customer advances for construction	18	17	[1]
Pension and other postretirement benefit obligations, net of plan assets	345	340	[1]
Deferred income taxes, net noncurrent liabilities	1,714	1,636	[1]
Deferred investment tax credits	26	25	[1]
Regulatory liabilities arising from removal obligations	1,658	1,603	[1]
Asset retirement obligations	744	733	[1]
Noncurrent reserve for wildfire litigation (Note 10)	45	22	[1]
Fixed-price contracts and other derivatives, noncurrent liabilities	200	209	[1]
Deferred credits and other	361	386	[1]
Total deferred credits and other liabilities	5,111	4,971	[1]
Contingently redeemable preferred stock	79	79	[1]
Equity:
Common stock	1,338	1,338	[1]
Retained earnings	2,986	2,895	[1]
Accumulated other comprehensive income (loss)	(11)	(11)	[1]
Total shareholders' equity	4,313	4,222	[1]
Other noncontrolling interests	72	76	[1]
Total equity	4,385	4,298	[1]
Total liabilities and equity	14,852	14,744	[1]
Southern California Gas Company [Member]
Current assets:
Cash and cash equivalents	72	83	[1]
Other accounts and notes receivable	94	51	[1]
Trade accounts receivable	466	539	[1]
Inventories	34	151	[1]
Due from unconsolidated affiliates	276	24	[1]
Income taxes receivable	96	104	[1]
Deferred income taxes, net current assets		3	[1]
Regulatory assets	4	4	[1]
Other current assets	26	35	[1]
Total current assets	1,068	994	[1]
Investments And Other Assets [Abstract]
Regulatory assets arising from pension and other postretirement benefit obligations	848	835	[1]
Other regulatory assets	155	148	[1]
Sundry	79	77	[1]
Total investments and other assets	1,082	1,060	[1]
Property, plant and equipment:
Property, plant and equipment	11,317	11,187	[1]
Less accumulated depreciation and amortization	(4,244)	(4,170)	[1]
Property, plant and equipment, net	7,073	7,017	[1]
Total assets	9,223	9,071	[1]
Current liabilities:
Accounts payable - trade	282	383	[1]
Accounts payable - other	70	82	[1]
Due to unconsolidated affiliates		37	[1]
Deferred income taxes, net current liabilities	8
Accrued compensation and benefits	94	116	[1]
Regulatory balancing accounts, net credit	294	141	[1]
Current portion of long-term debt	254	4	[1]
Customer deposits	76	76	[1]
Temporary LIFO liquidation	49
Other current liabilities	155	124	[1]
Total current liabilities	1,282	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	867	855	[1]
Deferred income taxes, net noncurrent liabilities	897	881	[1]
Deferred investment tax credits	20	20	[1]
Regulatory liabilities arising from removal obligations	1,110	1,103	[1]
Asset retirement obligations	1,247	1,238	[1]
Deferred credits and other	254	256	[1]
Total deferred credits and other liabilities	4,501	4,464	[1]
Equity:
Preferred stock	22	22	[1]
Common stock	866	866	[1]
Retained earnings	1,411	1,365	[1]
Accumulated other comprehensive income (loss)	(18)	(18)	[1]
Total shareholders' equity	2,281	2,235	[1]
Total equity	2,281	2,235
Total liabilities and equity	$ 9,223	$ 9,071	[1]

[1] Derived from audited financial statements.