Condensed Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Operating Revenues
Electric	$ 3,059	$ 2,931	$ 5,858	$ 5,703
Natural gas	717	662	1,590	1,531
Total operating revenues	3,776	3,593	7,448	7,234
Operating Expenses
Cost of electricity	1,189	962	2,172	1,821
Cost of natural gas	179	132	525	475
Operating and maintenance	1,256	1,426	2,594	2,794
Depreciation, amortization, and decommissioning	516	606	1,019	1,190
Total operating expenses	3,140	3,126	6,310	6,280
Operating Income	636	467	1,138	954
Interest income	2	3	4	4
Interest expense	(177)	(176)	(353)	(350)
Other income, net	24	32	52	58
Income Before Income Taxes	485	326	841	666
Income tax provision	153	87	267	191
Net Income	332	239	574	475
Preferred stock dividend requirement of subsidiary	4	4	7	7
Income Available for Common Shareholders	328	235	567	468
Weighted average common shares outstanding, basic	442	423	438	419
Weighted Average Common Shares Outstanding, Diluted	443	425	439	421
Net Earnings Per Common Share, Basic	$ 0.74	$ 0.56	$ 1.29	$ 1.12
Net Earnings Per Common Share, Diluted	$ 0.74	$ 0.55	$ 1.29	$ 1.11
Dividends Declared Per Common Share	$ 0.46	$ 0.46	$ 0.91	$ 0.91
Pacific Gas And Electric Company [Member]
Operating Revenues
Electric	3,057	2,930	5,855	5,701
Natural gas	718	662	1,591	1,531
Total operating revenues	3,775	3,592	7,446	7,232
Operating Expenses
Cost of electricity	1,189	962	2,172	1,821
Cost of natural gas	179	132	525	475
Operating and maintenance	1,256	1,425	2,592	2,791
Depreciation, amortization, and decommissioning	516	606	1,019	1,190
Total operating expenses	3,140	3,125	6,308	6,277
Operating Income	635	467	1,138	955
Interest income	3	2	4	3
Interest expense	(171)	(171)	(341)	(339)
Other income, net	22	22	46	45
Income Before Income Taxes	489	320	847	664
Income tax provision	160	93	281	206
Net Income	329	227	566	458
Preferred stock dividend requirement	4	4	7	7
Income Available for Common Shareholders	$ 325	$ 223	$ 559	$ 451