Condensed Consolidated Statements Of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Operating Revenues
Electric	$ 3,323	$ 3,465	$ 6,388	$ 6,596
Natural gas	927	704	2,130	1,547
Total operating revenues	4,250	4,169	8,518	8,143
Operating Expenses
Cost of electricity	1,123	1,156	1,970	2,106
Cost of natural gas	121	75	446	297
Operating and maintenance	1,546	1,838	3,050	3,848
Depreciation, amortization, and decommissioning	712	699	1,424	1,396
Total operating expenses	3,502	3,768	6,890	7,647
Operating Income	748	401	1,628	496
Interest income	8	5	13	9
Interest expense	(225)	(207)	(443)	(410)
Other income, net	13	23	34	50
Income Before Income Taxes	544	222	1,232	145
Income tax provision (benefit)	134	12	243	(175)
Net Income	410	210	989	320
Preferred stock dividend requirement of subsidiary	4	4	7	7
Income Available for Common Shareholders	$ 406	$ 206	$ 982	$ 313
Weighted Average Common Shares Outstanding, Basic	511	497	510	495
Weighted Average Common Shares Outstanding, Diluted	513	498	512	497
Net Earnings Per Common Share, Basic	$ 0.79	$ 0.41	$ 1.93	$ 0.63
Net Earnings Per Common Share, Diluted	0.79	0.41	1.92	0.63
Dividends Declared Per Common Share	$ 0.53	$ 0.49	$ 1.02	$ 0.95
Pacific Gas And Electric Company [Member]
Operating Revenues
Electric	$ 3,324	$ 3,465	$ 6,391	$ 6,597
Natural gas	926	704	2,130	1,547
Total operating revenues	4,250	4,169	8,521	8,144
Operating Expenses
Cost of electricity	1,123	1,156	1,970	2,106
Cost of natural gas	121	75	446	297
Operating and maintenance	1,545	1,837	3,049	3,848
Depreciation, amortization, and decommissioning	712	700	1,424	1,396
Total operating expenses	3,501	3,768	6,889	7,647
Operating Income	749	401	1,632	497
Interest income	7	4	12	8
Interest expense	(222)	(204)	(438)	(405)
Other income, net	11	21	28	45
Income Before Income Taxes	545	222	1,234	145
Income tax provision (benefit)	136	13	256	(172)
Net Income	409	209	978	317
Preferred stock dividend requirement	4	4	7	7
Income Available for Common Shareholders	$ 405	$ 205	$ 971	$ 310