SCHEDULE I – CONDENSED FINANCIAL INFORMATION OF PARENT (Schedule of Condensed Statement of Cash Flows) (Details) - USD ($) $ in Millions			1 Months Ended	12 Months Ended
	Jul. 01, 2020	Jun. 25, 2020	Jul. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities
Net Loss				$ (1,304)	$ (7,642)	$ (6,837)
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income taxes and tax credits, net				1,097	(2,948)	(2,532)
Reorganization items, net				1,458	108	0
Liabilities subject to compromise				413	12,222	0
Net cash provided by (used in) operating activities				(19,130)	4,816	4,752
Cash Flows from Investing Activities
Net cash used in investing activities				(7,748)	(6,378)	(6,564)
Cash Flows From Financing Activities:
Debtor-in-possession credit facility debt issuance costs				(6)	(113)	0
Bridge facility financing fees				(73)	0	0
Borrowings under credit facilities				8,554	0	3,960
Repayments under credit facilities				(3,949)	0	(775)
Net repayments of commercial paper				0	0	(182)
Repayment of long-term debt				(764)	0	(795)
Equity Units issued	$ 9,000	$ 3,970	$ 9,000	1,304	0	0
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
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
Operating lease liabilities arising from obtaining ROU assets				13	2,816	0
Common stock issued in satisfaction of liabilities				8,276	0	0
PG&E Corporation
Cash Flows from Operating Activities
Net Loss				(1,304)	(7,642)	(6,851)
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation amortization				28	43	78
Equity in earnings of subsidiaries				(412)	7,622	6,833
Deferred income taxes and tax credits, net				(50)	0	(62)
Reorganization items, net				1,548	11	0
Current income taxes receivable/payable				0	6	9
Liabilities subject to compromise				12	28	0
Other				97	(62)	41
Net cash provided by (used in) operating activities				(81)	6	48
Cash Flows from Investing Activities
Investment in subsidiaries				(12,986)	0	(45)
Net cash used in investing activities				(12,986)	0	(45)
Cash Flows From Financing Activities:
Debtor-in-possession credit facility debt issuance costs				0	(16)	0
Bridge facility financing fees				(40)	0	0
Borrowings under credit facilities				0	0	425
Repayments under credit facilities				0	0	(125)
Net repayments of commercial paper				0	0	(132)
Short-term debt financing				0	0	350
Proceeds from issuance of long-term debt				4,660	0	0
Repayment of long-term debt				(664)	0	(350)
Common stock issued				7,582	85	200
Equity Units issued				1,304	0	0
Net cash provided by financing activities				12,842	69	368
Net change in cash, cash equivalents, and restricted cash				(225)	75	371
Cash, cash equivalents, and restricted cash at January 1				448	373	2
Cash, cash equivalents, and restricted cash at December 31				223	448	373
Cash paid for:
Interest, net of amounts capitalized				(105)	(3)	(13)
Income taxes, net				0	0	10
Supplemental disclosures of noncash investing and financing activities
Operating lease liabilities arising from obtaining ROU assets				0	9	0
Common stock issued in satisfaction of liabilities				$ 8,276	$ 0	$ 0