CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities
Net income (Loss)	$ (1,304)	$ (7,642)	$ (6,837)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and decommissioning	3,468	3,234	3,036
Allowance for equity funds used during construction	(140)	(79)	(129)
Deferred income taxes and tax credits, net	1,097	(2,948)	(2,532)
Reorganization items, net	1,458	108	0
Wildfire fund expense	413	0	0
Disallowed capital expenditures	17	581	(45)
Other	399	207	332
Effect of changes in operating assets and liabilities:
Accounts receivable	(1,182)	(104)	(121)
Wildfire-related insurance receivable	1,564	35	(1,698)
Inventories	6	(80)	(73)
Accounts payable	58	516	409
Wildfire-related claims	(16,525)	(114)	13,665
Income taxes receivable/payable	0	23	(23)
Other current assets and liabilities	(1,079)	77	(281)
Regulatory assets, liabilities, and balancing accounts, net	(2,451)	(1,417)	(800)
Liabilities subject to compromise	413	12,222	0
Contributions to wildfire fund	(5,200)	0	0
Other noncurrent assets and liabilities	(142)	197	(151)
Net cash provided by (used in) operating activities	(19,130)	4,816	4,752
Cash Flows from Investing Activities
Capital expenditures	(7,690)	(6,313)	(6,514)
Proceeds from sales and maturities of nuclear decommissioning trust investments	1,518	956	1,412
Purchases of nuclear decommissioning trust investments	(1,590)	(1,032)	(1,485)
Other	14	11	23
Net cash used in investing activities	(7,748)	(6,378)	(6,564)
Cash Flows from Financing Activities
Proceeds from debtor-in-possession credit facility	500	1,850	0
Repayments of debtor-in-possession credit facility	(2,000)	(350)	0
Debtor-in-possession credit facility debt issuance costs	(6)	(113)	0
Bridge facility financing fees	(73)	0	0
Repayment of long-term debt	(764)	0	(795)
Borrowings under credit facilities	8,554	0	3,960
Repayments under credit facilities	(3,949)	0	(775)
Credit facilities financing fees	(22)	0	0
Net repayments of commercial paper, net of discount	0	0	(182)
Short-term debt financing, net of issuance costs of $2, $0, and $0 at respective dates	1,448	0	600
Short-term debt matured	0	0	(750)
Proceeds from issuance of long-term debt, net of premium, discount and issuance costs	13,497	0	793
Exchanged debt financing fees	(103)	0	0
Common stock issued	7,582	85	200
Equity Units issued	1,304	0	0
Other	(40)	(8)	(20)
Net cash provided by financing activities	25,928	1,464	3,031
Net change in cash, cash equivalents, and restricted cash	(950)	(98)	1,219
Cash, cash equivalents, and restricted cash at January 1	1,577	1,675	456
Cash, cash equivalents, and restricted cash at December 31	627	1,577	1,675
Less: Restricted cash and restricted cash equivalents	(143)	(7)	(7)
Cash and cash equivalents at December 31	484	1,570	1,668
Cash paid for:
Interest, net of amounts capitalized	(1,563)	(10)	(786)
Income taxes, net	0	0	(49)
Supplemental disclosures of noncash investing and financing activities
Capital expenditures financed through accounts payable	515	826	368
Operating lease liabilities arising from obtaining ROU assets	13	2,816	0
Common stock issued in satisfaction of liabilities	8,276	0	0
Pacific Gas & Electric Co (Utility)
Cash Flows from Operating Activities
Net income (Loss)	411	(7,622)	(6,818)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and decommissioning	3,469	3,233	3,036
Allowance for equity funds used during construction	(140)	(79)	(129)
Deferred income taxes and tax credits, net	1,141	(2,952)	(2,548)
Reorganization items, net	(90)	97	0
Wildfire fund expense	413	0	0
Disallowed capital expenditures	17	581	(45)
Other	370	167	258
Effect of changes in operating assets and liabilities:
Accounts receivable	(1,160)	(132)	(122)
Wildfire-related insurance receivable	1,564	35	(1,698)
Inventories	6	(80)	(73)
Accounts payable	(24)	579	421
Wildfire-related claims	(16,525)	(114)	13,665
Income taxes receivable/payable	0	5	(5)
Other current assets and liabilities	(1,141)	101	(301)
Regulatory assets, liabilities, and balancing accounts, net	(2,451)	(1,417)	(800)
Liabilities subject to compromise	401	12,194	0
Contributions to wildfire fund	(5,200)	0	0
Other noncurrent assets and liabilities	(108)	214	(137)
Net cash provided by (used in) operating activities	(19,047)	4,810	4,704
Cash Flows from Investing Activities
Capital expenditures	(7,690)	(6,313)	(6,514)
Proceeds from sales and maturities of nuclear decommissioning trust investments	1,518	956	1,412
Purchases of nuclear decommissioning trust investments	(1,590)	(1,032)	(1,485)
Other	14	11	23
Net cash used in investing activities	(7,748)	(6,378)	(6,564)
Cash Flows from Financing Activities
Proceeds from debtor-in-possession credit facility	500	1,850	0
Repayments of debtor-in-possession credit facility	(2,000)	(350)	0
Debtor-in-possession credit facility debt issuance costs	(6)	(97)	0
Bridge facility financing fees	(33)	0	0
Repayment of long-term debt	(100)		(445)
Borrowings under credit facilities	8,554	0	3,535
Repayments under credit facilities	(3,949)	0	(650)
Credit facilities financing fees	(22)	0	0
Net repayments of commercial paper, net of discount	0	0	(50)
Short-term debt financing, net of issuance costs of $2, $0, and $0 at respective dates	1,448	0	250
Short-term debt matured	0	0	(750)
Proceeds from issuance of long-term debt, net of premium, discount and issuance costs	8,837	0	793
Exchanged debt financing fees	(103)	0	0
Equity contribution from PG&E Corporation	12,986	0	45
Other	(42)	(8)	(20)
Net cash provided by financing activities	26,070	1,395	2,708
Net change in cash, cash equivalents, and restricted cash	(725)	(173)	848
Cash, cash equivalents, and restricted cash at January 1	1,129	1,302	454
Cash, cash equivalents, and restricted cash at December 31	404	1,129	1,302
Less: Restricted cash and restricted cash equivalents	(143)	(7)	(7)
Cash and cash equivalents at December 31	261	1,122	1,295
Cash paid for:
Interest, net of amounts capitalized	(1,458)	(7)	(773)
Income taxes, net	0	0	(59)
Supplemental disclosures of noncash investing and financing activities
Capital expenditures financed through accounts payable	515	826	368
Operating lease liabilities arising from obtaining ROU assets	13	2,807	0
Common stock equity infusion from PG&E Corporation used to satisfy liabilities	$ 6,750	$ 0	$ 0