Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows from Operating Activities
Net income	$ 989	$ 320
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and decommissioning	1,424	1,396
Allowance for equity funds used during construction	(34)	(54)
Deferred income taxes and tax credits, net	516	350
Disallowed capital expenditures	47	425
Other	121	179
Effect of changes in operating assets and liabilities:
Accounts receivable	111	(75)
Inventories	(38)	(30)
Accounts payable	19	179
Income taxes receivable/payable	67	(79)
Other current assets and liabilities	(92)	(7)
Regulatory assets, liabilities, and balancing accounts, net	(353)	(769)
Other noncurrent assets and liabilities	41	(106)
Butte-related insurance receivable	54	(263)
Butte-related third-party claims	(116)	349
Net cash provided by operating activities	2,756	1,815
Cash Flows from Investing Activities
Capital expenditures	(2,474)	(2,651)
Proceeds from sales and maturities of nuclear decommissioning trust investments	794	721
Purchases of nuclear decommissioning trust investments	(817)	(762)
Other	8	6
Net cash used in investing activities	(2,489)	(2,686)
Cash Flows from Financing Activities
Net issuances (repayments) of commercial paper, net of discount of $3 at respective dates	(339)	257
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	247	289
Common stock dividends paid	(488)	(440)
Other	(75)	(13)
Net cash provided by financing activities	(266)	937
Net change in cash and cash equivalents	1	66
Cash and cash equivalents at January 1	177	123
Cash and cash equivalents at June 30	178	189
Supplemental disclosures of cash flow information
Interest, net of amounts capitalized	(395)	(357)
Income taxes, net	68	54
Supplemental disclosures of noncash investing and financing activities
Common stock dividends declared but not yet paid	271	244
Capital expenditures financed through accounts payable	268	309
Noncash common stock issuances	10	10
Pacific Gas And Electric Company [Member]
Cash Flows from Operating Activities
Net income	978	317
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and decommissioning	1,424	1,396
Allowance for equity funds used during construction	(34)	(54)
Deferred income taxes and tax credits, net	534	352
Disallowed capital expenditures	47	425
Other	127	144
Effect of changes in operating assets and liabilities:
Accounts receivable	113	(76)
Inventories	(38)	(30)
Accounts payable	45	190
Income taxes receivable/payable	75	(78)
Other current assets and liabilities	(72)	(5)
Regulatory assets, liabilities, and balancing accounts, net	(353)	(769)
Other noncurrent assets and liabilities	40	(95)
Butte-related insurance receivable	54	(263)
Butte-related third-party claims	(116)	349
Net cash provided by operating activities	2,824	1,803
Cash Flows from Investing Activities
Capital expenditures	(2,474)	(2,651)
Proceeds from sales and maturities of nuclear decommissioning trust investments	794	721
Purchases of nuclear decommissioning trust investments	(817)	(762)
Other	8	6
Net cash used in investing activities	(2,489)	(2,686)
Cash Flows from Financing Activities
Net issuances (repayments) of commercial paper, net of discount of $3 at respective dates	(339)	257
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	(7)	(7)
Common stock dividends paid	(514)	(423)
Equity contribution from PG&E Corporation	190	280
Other	(68)	(7)
Net cash provided by financing activities	(349)	944
Net change in cash and cash equivalents	(14)	61
Cash and cash equivalents at January 1	71	59
Cash and cash equivalents at June 30	57	120
Supplemental disclosures of cash flow information
Interest, net of amounts capitalized	(390)	(352)
Income taxes, net	76	54
Supplemental disclosures of noncash investing and financing activities
Capital expenditures financed through accounts payable	$ 268	$ 309