Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current Assets
Cash and cash equivalents	$ 281	$ 401
Restricted cash	301	330
Accounts receivable
Customers (net of allowance for doubtful accounts of $81 and $87 at respective dates)	1,099	937
Accrued unbilled revenue	809	761
Regulatory balancing accounts	1,004	936
Other	286	365
Regulatory assets	483	564
Inventories
Gas stored underground and fuel oil	184	135
Materials and supplies	316	309
Income taxes receivable	377	211
Other	382	172
Total current assets	5,522	5,121
Property, Plant, and Equipment
Electric	41,939	39,701
Gas	13,381	12,571
Construction work in progress	1,996	1,894
Other	1	1
Total property, plant, and equipment	57,317	54,167
Accumulated depreciation	(17,560)	(16,644)
Net property, plant, and equipment	39,757	37,523
Other Noncurrent Assets
Regulatory assets	6,827	6,809
Nuclear decommissioning trusts	2,272	2,161
Income taxes receivable	163	176
Other	673	659
Total other noncurrent assets	9,935	9,805
TOTAL ASSETS	55,214	52,449
Current Liabilities
Short-term borrowings	953	492
Long-term debt, classified as current	1,288	400
Accounts payable
Trade creditors	1,303	1,241
Disputed claims and customer refunds	156	157
Regulatory balancing accounts	1,002	634
Other	388	444
Interest payable	852	870
Income taxes payable	39	6
Deferred income taxes	1,663	2,012
Other	7,644	6,256
Total current liabilities
Noncurrent Liabilities
Long-term debt	11,918	12,517
Regulatory liabilities	5,343	5,088
Pension and other postretirement benefits	3,711	3,575
Asset retirement obligations	2,946	2,919
Deferred income taxes	7,275	6,748
Other	2,117	2,020
Total noncurrent liabilities	33,310	32,867
Commitments and Contingencies (Note 10)
Shareholders' Equity
Preferred stock	0	0
Common stock	9,212	8,428
Reinvested earnings	4,866	4,747
Accumulated other comprehensive loss	(70)	(101)
Total shareholders' equity	14,008	13,074
Noncontrolling Interest - Preferred Stock of Subsidiary	252	252
Total equity	14,260	13,326
TOTAL LIABILITIES AND EQUITY	55,214	52,449
Pacific Gas And Electric Company [Member]
Current Assets
Cash and cash equivalents	60	194
Restricted cash	301	330
Accounts receivable
Customers (net of allowance for doubtful accounts of $81 and $87 at respective dates)	1,099	937
Accrued unbilled revenue	809	761
Regulatory balancing accounts	1,004	936
Other	289	366
Regulatory assets	483	564
Inventories
Gas stored underground and fuel oil	184	135
Materials and supplies	316	309
Income taxes receivable	377	186
Other	344	160
Total current assets	5,266	4,878
Property, Plant, and Equipment
Electric	41,939	39,701
Gas	13,381	12,571
Construction work in progress	1,996	1,894
Total property, plant, and equipment	57,316	54,166
Accumulated depreciation	(17,559)	(16,643)
Net property, plant, and equipment	39,757	37,523
Other Noncurrent Assets
Regulatory assets	6,827	6,809
Nuclear decommissioning trusts	2,272	2,161
Income taxes receivable	158	171
Other	411	381
Total other noncurrent assets	9,668	9,522
TOTAL ASSETS	54,691	51,923
Current Liabilities
Short-term borrowings	693	372
Long-term debt, classified as current	938	400
Accounts payable
Trade creditors	1,303	1,241
Disputed claims and customer refunds	156	157
Regulatory balancing accounts	1,002	634
Other	404	419
Interest payable	841	865
Income taxes payable	49	12
Deferred income taxes	1,443	1,794
Other	6,829	5,894
Total current liabilities
Noncurrent Liabilities
Long-term debt	11,918	12,167
Regulatory liabilities	5,343	5,088
Pension and other postretirement benefits	3,628	3,497
Asset retirement obligations	2,946	2,919
Deferred income taxes	7,484	6,939
Other	2,055	1,959
Total noncurrent liabilities	33,374	32,569
Commitments and Contingencies (Note 10)
Shareholders' Equity
Preferred stock	258	258
Common stock	1,322	1,322
Additional paid-in capital	5,516	4,682
Reinvested earnings	7,472	7,291
Accumulated other comprehensive loss	(80)	(93)
Total shareholders' equity	14,488	13,460
TOTAL LIABILITIES AND EQUITY	$ 54,691	$ 51,923