SCHEDULE I – CONDENSED FINANCIAL INFORMATION OF PARENT (Schedule of Condensed Statement of Cash Flows) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended									12 Months Ended
	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Jan. 31, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Operating Activities
Net income										$ (6,837)	$ 1,660	$ 1,407
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income taxes and tax credits, net										(2,532)	1,254	1,030
Net cash provided by operating activities										4,752	5,977	4,409
Cash Flows from Investing Activities
Net cash used in investing activities										(6,564)	(5,650)	(5,753)
Cash Flows From Financing Activities:
Borrowings under revolving credit facilities										3,960	0	0
Repayments under revolving credit facilities										(775)	0	0
Net issuances (repayments) of commercial paper, net of discount of $1 in 2017										(182)	(840)	(9)
Short-term debt financing										600	750	500
Long-term debt matured or repurchased										(795)	(1,445)	(160)
Common stock issued										200	395	822
Common stock dividends paid										0	(1,021)	(921)
Net cash provided by (used in) financing activities										3,031	(55)	1,171
Cash and cash equivalents, beginning of period				$ 177						449	177
Cash and cash equivalents, end of period										1,668	449	177
Cash received (paid) for:
Interest, net of amounts capitalized										(786)	(790)	(726)
Income taxes, net										(49)	162	231
Supplemental disclosure of noncash investing and financing activities
Common stock dividends declared but not yet paid										0	0	248
Noncash common stock issuances										0	21	20
Discount on net issuances of commercial paper										1	5	6
PG&E Corporation
Cash Flows from Operating Activities
Net income										(6,851)	1,646	1,393
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation amortization										78	20	74
Equity in earnings of subsidiaries										6,833	(1,667)	(1,388)
Deferred income taxes and tax credits, net										(62)	139	11
Current income taxes receivable/payable										9	(2)	(1)
Other										41	(75)	(24)
Net cash provided by operating activities										48	61	65
Cash Flows from Investing Activities
Investment in subsidiaries										(45)	(455)	(835)
Dividends received from subsidiaries										0	784	911
Net cash used in investing activities										(45)	329	76
Cash Flows From Financing Activities:
Borrowings under revolving credit facilities										425	0	0
Repayments under revolving credit facilities										(125)	0	0
Net issuances (repayments) of commercial paper, net of discount of $1 in 2017										(132)	132	0
Short-term debt financing										350	0	0
Long-term debt matured or repurchased										(350)	0	0
Common stock issued										200	395	822
Common stock dividends paid										0	(1,021)	(921)
Net cash provided by (used in) financing activities										368	(494)	(99)
Net change in cash, cash equivalents, and restricted cash										371	(104)	42
Cash and cash equivalents, beginning of period				$ 106				$ 64		2	106	64
Cash and cash equivalents, end of period										373	2	106
Cash received (paid) for:
Interest, net of amounts capitalized										(13)	(9)	(9)
Income taxes, net										10	0	(13)
Supplemental disclosure of noncash investing and financing activities
Common stock dividends declared but not yet paid										0	0	248
Noncash common stock issuances										$ 0	21	$ 20
Common stock dividends paid per share (in dollars per share)	$ 0.53	$ 0.53	$ 0.49	$ 0.49	$ 0.49	$ 0.49	$ 0.455	$ 0.455	$ 0.455
Discount on net issuances of commercial paper											$ 1