Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows from Operating Activities
Net income	$ 1,542	$ 711
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and decommissioning	2,134	2,090
Allowance for equity funds used during construction	(63)	(84)
Deferred income taxes and tax credits, net	848	644
Disallowed capital expenditures	47	517
Other	204	293
Effect of changes in operating assets and liabilities:
Accounts receivable	(58)	(283)
Inventories	(35)	(38)
Accounts payable	76	189
Income taxes receivable/payable	135	(63)
Other current assets and liabilities	23	(32)
Regulatory assets, liabilities, and balancing accounts, net	(30)	(634)
Other noncurrent assets and liabilities	68	(85)
Butte-related insurance receivable	(166)	(263)
Butte-related third-party claims	12	321
Net cash provided by operating activities	4,737	3,283
Cash Flows from Investing Activities
Capital expenditures	(3,938)	(4,128)
Decrease in restricted cash	0	66
Proceeds from sales and maturities of nuclear decommissioning trust investments	1,043	1,019
Purchases of nuclear decommissioning trust investments	(1,071)	(1,050)
Other	16	10
Net cash used in investing activities	(3,950)	(4,083)
Cash Flows from Financing Activities
Net issuances (repayments) of commercial paper, net of discount of $4 and $5 at respective dates	(652)	(128)
Short-term debt financing	250	250
Short-term debt matured	(250)	0
Proceeds from issuance of long-term debt, net of discount and issuance costs of $11 and $6 at respective dates	734	594
Long-term debt matured or repurchased	(345)	0
Common stock issued	345	727
Common stock dividends paid	(754)	(678)
Other	(101)	(17)
Net cash provided by financing activities	(773)	748
Net change in cash and cash equivalents	14	(52)
Cash and cash equivalents at January 1	177	123
Cash and cash equivalents at September 30	191	71
Supplemental disclosures of cash flow information
Interest, net of amounts capitalized	(644)	(611)
Income taxes, net	158	154
Supplemental disclosures of noncash investing and financing activities
Common stock dividends declared but not yet paid	272	248
Capital expenditures financed through accounts payable	301	325
Noncash common stock issuances	16	15
Pacific Gas And Electric Company [Member]
Cash Flows from Operating Activities
Net income	1,491	706
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and decommissioning	2,134	2,090
Allowance for equity funds used during construction	(63)	(84)
Deferred income taxes and tax credits, net	848	648
Disallowed capital expenditures	47	517
Other	196	234
Effect of changes in operating assets and liabilities:
Accounts receivable	(58)	(283)
Inventories	(35)	(38)
Accounts payable	76	194
Income taxes receivable/payable	135	(64)
Other current assets and liabilities	36	(28)
Regulatory assets, liabilities, and balancing accounts, net	(30)	(634)
Other noncurrent assets and liabilities	69	(75)
Butte-related insurance receivable	(166)	(263)
Butte-related third-party claims	12	321
Net cash provided by operating activities	4,692	3,241
Cash Flows from Investing Activities
Capital expenditures	(3,938)	(4,128)
Decrease in restricted cash	0	66
Proceeds from sales and maturities of nuclear decommissioning trust investments	1,043	1,019
Purchases of nuclear decommissioning trust investments	(1,071)	(1,050)
Other	16	10
Net cash used in investing activities	(3,950)	(4,083)
Cash Flows from Financing Activities
Net issuances (repayments) of commercial paper, net of discount of $4 and $5 at respective dates	(652)	(293)
Short-term debt financing	250	250
Short-term debt matured	(250)	0
Proceeds from issuance of long-term debt, net of discount and issuance costs of $11 and $6 at respective dates	734	594
Long-term debt matured or repurchased	(345)	0
Preferred stock dividends paid	(10)	(10)
Common stock dividends paid	(784)	(423)
Equity contribution from PG&E Corporation	405	740
Other	(91)	(7)
Net cash provided by financing activities	(743)	851
Net change in cash and cash equivalents	(1)	9
Cash and cash equivalents at January 1	71	59
Cash and cash equivalents at September 30	70	68
Supplemental disclosures of cash flow information
Interest, net of amounts capitalized	(636)	(602)
Income taxes, net	158	151
Supplemental disclosures of noncash investing and financing activities
Common stock dividends declared but not yet paid	0	244
Capital expenditures financed through accounts payable	$ 301	$ 325