Condensed Consolidated Statements Of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating Revenues
Electric	$ 3,648	$ 3,994	$ 10,036	$ 10,590
Natural gas	869	816	2,999	2,363
Total operating revenues	4,517	4,810	13,035	12,953
Operating Expenses
Cost of electricity	1,466	1,613	3,436	3,719
Cost of natural gas	78	80	524	377
Operating and maintenance	1,364	1,783	4,414	5,631
Depreciation, amortization, and decommissioning	710	694	2,134	2,090
Total operating expenses	3,618	4,170	10,508	11,817
Operating Income	899	640	2,527	1,136
Interest income	9	8	22	17
Interest expense	(220)	(211)	(663)	(621)
Other income, net	25	24	59	74
Income Before Income Taxes	713	461	1,945	606
Income tax provision (benefit)	160	70	403	(105)
Net Income	553	391	1,542	711
Preferred stock dividend requirement of subsidiary	3	3	10	10
Income Available for Common Shareholders	$ 550	$ 388	$ 1,532	$ 701
Weighted Average Common Shares Outstanding, Basic	513	501	511	497
Weighted Average Common Shares Outstanding, Diluted	516	503	514	500
Net Earnings Per Common Share, Basic	$ 1.07	$ 0.77	$ 3.00	$ 1.41
Net Earnings Per Common Share, Diluted	1.07	0.77	2.98	1.40
Dividends Declared Per Common Share	$ 0.53	$ 0.49	$ 1.55	$ 1.44
Pacific Gas And Electric Company [Member]
Operating Revenues
Electric	$ 3,647	$ 3,993	$ 10,038	$ 10,590
Natural gas	869	816	2,999	2,363
Total operating revenues	4,516	4,809	13,037	12,953
Operating Expenses
Cost of electricity	1,466	1,613	3,436	3,719
Cost of natural gas	78	80	524	377
Operating and maintenance	1,428	1,782	4,477	5,630
Depreciation, amortization, and decommissioning	710	694	2,134	2,090
Total operating expenses	3,682	4,169	10,571	11,816
Operating Income	834	640	2,466	1,137
Interest income	10	8	22	16
Interest expense	(217)	(209)	(655)	(614)
Other income, net	24	23	52	68
Income Before Income Taxes	651	462	1,885	607
Income tax provision (benefit)	138	73	394	(99)
Net Income	513	389	1,491	706
Preferred stock dividend requirement	3	3	10	10
Income Available for Common Shareholders	$ 510	$ 386	$ 1,481	$ 696