SCHEDULE I – CONDENSED FINANCIAL INFORMATION OF PARENT (Schedule of Condensed Income Statement and Comprehensive Income) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating expenses	$ (27,223)	$ (26,459)	$ (14,230)
Interest income	82	76	31
Interest expense	(934)	(929)	(888)
Other income, net	250	424	123
Reorganization items, net	(346)	0	0
Income (Loss) Before Income Taxes	(11,042)	(10,129)	2,171
Income tax provision (benefit)	(3,400)	(3,292)	511
Income (Loss) Available for Common Shareholders	(7,656)	(6,851)	1,646
Other Comprehensive Income
Pension and other postretirement benefit plans obligations	(1)	4	1
Total other comprehensive income (loss)	$ (1)	$ 4	$ 1
Weighted Average Common Shares Outstanding, Basic (in shares)	528	517	512
Weighted Average Common Shares Outstanding, Diluted (in shares)	528	517	513
Net Earnings (Loss) Per Common Share, Basic (in dollars per share)	$ (14.50)	$ (13.25)	$ 3.21
Net Earnings (Loss) Per Common Share, Diluted (in dollars per share)	$ (14.50)	$ (13.25)	$ 3.21
Pension and other postretirement benefit plans obligations, tax	$ 0	$ 2	$ 0
PG&E Corporation
Operating expenses	(114)	(91)	(5)
Interest income	1	2	1
Interest expense	(21)	(15)	(11)
Other income, net	10	(2)	4
Reorganization items, net	(26)	0	0
Equity in earnings of subsidiaries	(7,622)	(6,832)	1,667
Income (Loss) Before Income Taxes	(7,634)	(6,848)	1,719
Income tax provision (benefit)	8	3	73
Income (Loss) Available for Common Shareholders	(7,642)	(6,851)	1,646
Other Comprehensive Income
Pension and other postretirement benefit plans obligations	(1)	4	1
Total other comprehensive income (loss)	(1)	4	1
Comprehensive Income	$ (7,643)	$ (6,847)	$ 1,647
Weighted Average Common Shares Outstanding, Basic (in shares)	528	517	512
Weighted Average Common Shares Outstanding, Diluted (in shares)	528	513	513
Net Earnings (Loss) Per Common Share, Basic (in dollars per share)	$ (14.50)	$ (13.25)	$ 3.21
Net Earnings (Loss) Per Common Share, Diluted (in dollars per share)	$ (14.50)	$ (13.25)	$ 3.21
Pension and other postretirement benefit plans obligations, tax	$ 0	$ 0	$ 0
Administrative service revenue | PG&E Corporation
Revenue	$ 138	$ 90	$ 63