Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current Assets
Cash and cash equivalents	$ 281	$ 401
Restricted cash	305	330
Accounts receivable
Customers (net of allowance for doubtful accounts of $80 and $87 at respective dates)	1,034	937
Accrued unbilled revenue	766	761
Regulatory balancing accounts	1,205	936
Other	272	365
Regulatory assets	508	564
Inventories
Gas stored underground and fuel oil	148	135
Materials and supplies	327	309
Income taxes receivable	365	211
Other	231	172
Total current assets	5,442	5,121
Property, Plant, and Equipment
Electric	41,227	39,701
Gas	13,162	12,571
Construction work in progress	2,030	1,894
Other	1	1
Total property, plant, and equipment	56,420	54,167
Accumulated depreciation	(17,353)	(16,644)
Net property, plant, and equipment	39,067	37,523
Other Noncurrent Assets
Regulatory assets	6,786	6,809
Nuclear decommissioning trusts	2,214	2,161
Income taxes receivable	126	176
Other	689	659
Total other noncurrent assets	9,815	9,805
TOTAL ASSETS	54,324	52,449
Current Liabilities
Short-term borrowings	952	492
Long-term debt, classified as current	1,288	400
Accounts payable
Trade creditors	1,155	1,241
Disputed claims and customer refunds	156	157
Regulatory balancing accounts	1,002	634
Other	456	444
Interest payable	877	870
Income taxes payable	17	6
Deferred income taxes	106	0
Other	1,373	2,012
Total current liabilities	7,382	6,256
Noncurrent Liabilities
Long-term debt	11,917	12,517
Regulatory liabilities	5,226	5,088
Pension and other postretirement benefits	3,665	3,575
Asset retirement obligations	2,932	2,919
Deferred income taxes	6,988	6,748
Other	2,092	2,020
Total noncurrent liabilities	32,820	32,867
Commitments and Contingencies (Note 10)
Shareholders' Equity
Preferred stock	0	0
Common stock	9,032	8,428
Reinvested earnings	4,909	4,747
Accumulated other comprehensive loss	(71)	(101)
Total shareholders' equity	13,870	13,074
Noncontrolling Interest - Preferred Stock of Subsidiary	252	252
Total equity	14,122	13,326
TOTAL LIABILITIES AND EQUITY	54,324	52,449
Pacific Gas And Electric Company [Member]
Current Assets
Cash and cash equivalents	61	194
Restricted cash	305	330
Accounts receivable
Customers (net of allowance for doubtful accounts of $80 and $87 at respective dates)	1,034	937
Accrued unbilled revenue	766	761
Regulatory balancing accounts	1,205	936
Other	275	366
Regulatory assets	508	564
Inventories
Gas stored underground and fuel oil	148	135
Materials and supplies	327	309
Income taxes receivable	361	186
Other	169	160
Total current assets	5,159	4,878
Property, Plant, and Equipment
Electric	41,227	39,701
Gas	13,162	12,571
Construction work in progress	2,030	1,894
Total property, plant, and equipment	56,419	54,166
Accumulated depreciation	(17,352)	(16,643)
Net property, plant, and equipment	39,067	37,523
Other Noncurrent Assets
Regulatory assets	6,786	6,809
Nuclear decommissioning trusts	2,214	2,161
Income taxes receivable	122	171
Other	417	381
Total other noncurrent assets	9,539	9,522
TOTAL ASSETS	53,765	51,923
Current Liabilities
Short-term borrowings	692	372
Long-term debt, classified as current	938	400
Accounts payable
Trade creditors	1,155	1,241
Disputed claims and customer refunds	156	157
Regulatory balancing accounts	1,002	634
Other	471	419
Interest payable	872	865
Income taxes payable	25	12
Deferred income taxes	85	0
Other	1,155	1,794
Total current liabilities	6,551	5,894
Noncurrent Liabilities
Long-term debt	11,917	12,167
Regulatory liabilities	5,226	5,088
Pension and other postretirement benefits	3,583	3,497
Asset retirement obligations	2,932	2,919
Deferred income taxes	7,191	6,939
Other	2,031	1,959
Total noncurrent liabilities	32,880	32,569
Commitments and Contingencies (Note 10)
Shareholders' Equity
Preferred stock	258	258
Common stock	1,322	1,322
Additional paid-in capital	5,346	4,682
Reinvested earnings	7,492	7,291
Accumulated other comprehensive loss	(84)	(93)
Total shareholders' equity	14,334	13,460
TOTAL LIABILITIES AND EQUITY	$ 53,765	$ 51,923