BANKRUPTCY FILING (Schedule of Liabilities Subject to Compromise) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Feb. 18, 2021	Dec. 31, 2019
Liabilities Subject to Compromise, Period Increase (Decrease) [Roll Forward]
Financing debt, beginning balance	$ 23,116.0	$ 23,116.0
Wildfire-related claims, beginning balance	25,548.0	25,548.0
Trade creditors, beginning balance	1,188.0	1,188.0
Non-qualified benefit plan, beginning balance	157.0	157.0
2001 bankruptcy disputed claims, beginning balance	234.0	234.0
Customer deposits & advances, beginning balance	71.0	71.0
Other, beginning balance	232.0	232.0
Liabilities Subject to Compromise, beginning balance	50,546.0	50,546.0
Financing debt, ending balance		0.0
Wildfire-related claims, ending balance		0.0
Trade creditors, ending balance		0.0
Non-qualified benefit plan, ending balance		0.0
2001 bankruptcy disputed claims, ending balance		0.0
Customer deposits & advances, ending balance		0.0
Other, ending balance		0.0
Liabilities Subject to Compromise, ending balance		0.0
Accounts payable - other		580.0		$ 566.0
Disputed claims and customer refunds		242.0		0.0
Interest payable		498.0		4.0
Short-term borrowings		3,547.0		0.0
Long-term debt, classified as current		28.0		0.0
Other		2,256.0		1,254.0
Other non-current liabilities		3,848.0		2,573.0
Pension and other postretirement benefits		2,444.0		1,884.0
Accounts payable - trade creditors		2,402.0		1,954.0
Wildfire-related claims		2,250.0		0.0
Change in Estimated Allowed Claim
Liabilities Subject to Compromise, Period Increase (Decrease) [Roll Forward]
Financing debt, change		351.0
Wildfire-related claims, change		18.0
Trade creditors, change		6.0
Non-qualified benefit plan, change		0.0
2011 bankruptcy disputed claims, change		4.0
Customer deposits & advances, change		12.0
Other, change		59.0
Liabilities Subject to Compromise, change		450.0
Cash Payment
Liabilities Subject to Compromise, Period Increase (Decrease) [Roll Forward]
Financing debt, change		0.0
Wildfire-related claims, change		(23.0)
Trade creditors, change		(14.0)
Non-qualified benefit plan, change		0.0
2011 bankruptcy disputed claims, change		0.0
Customer deposits & advances, change		0.0
Other, change		0.0
Liabilities Subject to Compromise, change		(37.0)
Reclassified
Liabilities Subject to Compromise, Period Increase (Decrease) [Roll Forward]
Financing debt, change	(23,467.0)
Wildfire-related claims, change	(25,543.0)
Trade creditors, change	(1,180.0)
Non-qualified benefit plan, change	(157.0)
2011 bankruptcy disputed claims, change	(238.0)
Customer deposits & advances, change	(83.0)
Other, change	(291.0)
Liabilities Subject to Compromise, change	(50,959.0)
Accounts payable - other	8.6
Disputed claims and customer refunds	237.6
Interest payable	1,347.4
Debt financial instrument	21,425.7
Short-term borrowings	300.0
Long-term debt, classified as current	450.0
Other	301.0
Other non-current liabilities	97.9
Pension and other postretirement benefits	121.3
Accounts payable - trade creditors	1,126.9
Wildfire-related claims	25,542.7
Pacific Gas & Electric Co (Utility)
Liabilities Subject to Compromise, Period Increase (Decrease) [Roll Forward]
Financing debt, beginning balance	22,450.0	22,450.0
Wildfire-related claims, beginning balance	25,548.0	25,548.0
Trade creditors, beginning balance	1,183.0	1,183.0
Non-qualified benefit plan, beginning balance	20.0	20.0
2001 bankruptcy disputed claims, beginning balance	234.0	234.0
Customer deposits & advances, beginning balance	71.0	71.0
Other, beginning balance	230.0	230.0
Liabilities Subject to Compromise, beginning balance	49,736.0	49,736.0
Financing debt, ending balance		0.0
Wildfire-related claims, ending balance		0.0
Trade creditors, ending balance		0.0
Non-qualified benefit plan, ending balance		0.0
2001 bankruptcy disputed claims, ending balance		0.0
Customer deposits & advances, ending balance		0.0
Other, ending balance		0.0
Liabilities Subject to Compromise, ending balance		0.0
Accounts payable - other		624.0		675.0
Disputed claims and customer refunds		242.0		0.0
Interest payable		444.0		4.0
Short-term borrowings		3,547.0		0.0
Other		2,248.0		1,263.0
Other non-current liabilities		3,886.0		2,626.0
Pension and other postretirement benefits		2,328.0		1,884.0
Accounts payable - trade creditors		2,366.0		1,949.0
Wildfire-related claims		2,250.0		0.0
Pacific Gas & Electric Co (Utility) | Subsequent Event
Liabilities Subject to Compromise, Period Increase (Decrease) [Roll Forward]
Accounts payable, trade			$ 941.0
PG&E Corporation
Liabilities Subject to Compromise, Period Increase (Decrease) [Roll Forward]
Financing debt, beginning balance	666.0	666.0
Wildfire-related claims, beginning balance	0.0	0.0
Trade creditors, beginning balance	5.0	5.0
Non-qualified benefit plan, beginning balance	137.0	137.0
2001 bankruptcy disputed claims, beginning balance	0.0	0.0
Customer deposits & advances, beginning balance	0.0	0.0
Other, beginning balance	2.0	2.0
Liabilities Subject to Compromise, beginning balance	$ 810.0	810.0
Financing debt, ending balance		0.0
Wildfire-related claims, ending balance		0.0
Trade creditors, ending balance		0.0
Non-qualified benefit plan, ending balance		0.0
2001 bankruptcy disputed claims, ending balance		0.0
Customer deposits & advances, ending balance		0.0
Other, ending balance		0.0
Liabilities Subject to Compromise, ending balance		0.0
Long-term debt, classified as current		28.0		0.0
Other		72.0		3.0
Other non-current liabilities		$ 191.0		$ 58.0
PG&E Corporation | Subsequent Event
Liabilities Subject to Compromise, Period Increase (Decrease) [Roll Forward]
Accounts payable, trade			$ 5.0