Consolidated Statements Of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Revenues
Electric	$ 13,124	$ 13,864	$ 13,657
Natural gas	4,011	3,802	3,176
Total operating revenues	17,135	17,666	16,833
Operating Expenses
Cost of electricity	4,309	4,765	5,099
Cost of natural gas	746	615	663
Operating and maintenance	6,270	7,354	6,951
Depreciation, amortization, and decommissioning	2,854	2,755	2,612
Total operating expenses	14,179	15,489	15,325
Operating Income	2,956	2,177	1,508
Interest income	31	23	9
Interest expense	(888)	(829)	(773)
Other income (expense)	72	91	117
Income Before Income Taxes	2,171	1,462	861
Income tax provision (benefit)	511	55	(27)
Net Income	1,660	1,407	888
Preferred stock dividend requirement of subsidiary	14	14	14
Income Available for Common Shareholders	$ 1,646	$ 1,393	$ 874
Weighted Average Common Shares Outstanding, Basic	512	499	484
Weighted Average Common Shares Outstanding, Diluted	513	501	487
Net earnings per common share, basic	$ 3.21	$ 2.79	$ 1.81
Net Earnings Per Common Share, Diluted	$ 3.21	$ 2.78	$ 1.79
Pacific Gas And Electric Company [Member]
Operating Revenues
Electric	$ 13,127	$ 13,865	$ 13,657
Natural gas	4,011	3,802	3,176
Total operating revenues	17,138	17,667	16,833
Operating Expenses
Cost of electricity	4,309	4,765	5,099
Cost of natural gas	746	615	663
Operating and maintenance	6,329	7,352	6,949
Depreciation, amortization, and decommissioning	2,854	2,754	2,611
Total operating expenses	14,238	15,486	15,322
Operating Income	2,900	2,181	1,511
Interest income	30	22	8
Interest expense	(877)	(819)	(763)
Other income (expense)	65	88	87
Income Before Income Taxes	2,118	1,472	843
Income tax provision (benefit)	427	70	(19)
Net Income	1,691	1,402	862
Preferred stock dividend requirement	14	14	14
Income Available for Common Shareholders	$ 1,677	$ 1,388	$ 848