BANKRUPTCY FILING (Narrative) (Details)				3 Months Ended
	Oct. 11, 2019 USD ($)	Sep. 23, 2019 USD ($)	Sep. 22, 2019 USD ($)	Mar. 31, 2020 USD ($) proofOfClaim structure shares	Mar. 31, 2019 USD ($)	Feb. 14, 2020 USD ($)	Feb. 13, 2020 USD ($)	Jan. 22, 2020 USD ($)	Dec. 30, 2019 USD ($)	Dec. 06, 2019 USD ($)	Jan. 31, 2019 USD ($)
Debt Instrument [Line Items]
TCC claims settlement, amount		$ 11,000,000,000.0
Subrogation claims, professional fees			$ 55,000,000
TCC RSA settlement										$ 13,500,000,000
Payment for settlement of claims										1,000,000,000.0
Professional fees								$ 99,000,000
Equity raise		$ 9,000,000,000.0
Insurance from wildfire events										2,200,000,000
Debt commitment letters, required equity funding	$ 12,000,000,000.0
Backstop commitment letters, tax benefits				$ 1,350,000,000
Reorganization, weighted average earning base rate				0.95
Reorganization, weighted average earnings				$ 48,000,000,000
Aggregate liability for prepetition wildfire related claims, cannot exceed amount				$ 25,500,000,000
Number of days for effective date for confirmation order				60 days
Asserted administrative expense claims, maximum				$ 250,000,000
Maximum number of structures that can be destroyed in wildfire in 2020 | structure				500
Backstop commitment letters, cash proceeds				$ 3,000,000,000.0
Backstop commitment premium, common stock, shares | shares				119,000,000.0
Backstop commitment letters, common stock, value				$ 12,000,000,000
Backstop commitment premium, common stock, market value change				$ 764,000,000
Backstop commitment premium, common stock, additional share cap (in shares) | shares				19,909,091
Backstop commitment premium, expense				$ 1,000,000,000
Professional fees reimbursement				34,000,000
Professional fees, legal, reimbursement				19,000,000
Probable of recovery				$ 18,000,000
Number of proofs of claim | proofOfClaim				100,000
Interest rate on trade payable				10.00%
Bridge Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 10,825,000,000
Debt instrument, term (in days)	364 days
Expected debt fees payable	$ 75,000,000
Bridge Loan | Secured debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	5,825,000,000
Bridge Loan | Unsecured debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 5,000,000,000.0
Pacific Gas & Electric Co
Debt Instrument [Line Items]
TCC claims settlement, amount			$ 11,000,000,000.0
Subrogation claims, professional fees				$ 47,500,000
Amendment, debt and equity, amount						$ 33,350,000,000	$ 30,000,000,000
Amendment, other funding, increase amount						6,000,000,000.0
Facility fees				14,000,000
Payments for reorganization items				117,000,000	$ 91,000,000
DIP Credit Agreement
Debt Instrument [Line Items]
Debt, face value									$ 11,900,000,000
Post-petition interest rate									2.59%
DIP Credit Agreement | Line of Credit | Secured debt
Debt Instrument [Line Items]
Amount arranged											$ 5,500,000,000
Fire Victim Trust
Debt Instrument [Line Items]
Issuance										6,750,000,000
New PG&E Corporation Debt
Debt Instrument [Line Items]
Issuance										4,750,000,000
Utility Reinstated Senior Notes
Debt Instrument [Line Items]
Debt, face value									$ 9,580,000,000
PG&E Corporation
Debt Instrument [Line Items]
Maximum amount able to be drawn										12,000,000,000.0
Legal fees								6,000,000
Amendment, debt and equity, amount						5,000,000,000.0	$ 7,000,000,000.0
Amendment, other funding, increase amount						$ 2,000,000,000.0
Facility fees				36,000,000
Payments for reorganization items				$ 57,000,000	$ 17,000,000
PG&E Corporation | New Utility Debt
Debt Instrument [Line Items]
Issuance										23,775,000,000
PG&E Corporation | New Utility Short-Term Notes
Debt Instrument [Line Items]
Issuance										1,750,000,000
Debt, face value								$ 875,000,000
Stated interest rate								3.75%
PG&E Corporation | New Debt Securities or Bank Debt
Debt Instrument [Line Items]
Issuance										11,925,000,000
Expected repayment										6,000,000,000.0
PG&E Corporation | Utility Short-Term Senior Notes
Debt Instrument [Line Items]
Debt, face value								$ 1,750,000,000
PG&E Corporation | Utility Short-Term Secured Notes Due 2025
Debt Instrument [Line Items]
Debt, face value								$ 875,000,000
Stated interest rate								3.45%
PG&E Corporation | Senior Note Due March 1, 2034
Debt Instrument [Line Items]
Stated interest rate								6.05%
PG&E Corporation | Utility Long-Term Senior Notes
Debt Instrument [Line Items]
Debt, face value								$ 6,200,000,000
Stated interest rate								5.00%
PG&E Corporation | Utility Long-Term Secured Notes Due 2030
Debt Instrument [Line Items]
Debt, face value								$ 3,100,000,000
Stated interest rate								4.55%
PG&E Corporation | New Utility Long-Term Notes
Debt Instrument [Line Items]
Issuance										6,200,000,000
Debt, face value								$ 3,100,000,000
Stated interest rate								4.95%
PG&E Corporation | Senior Note Due December 1, 2047
Debt Instrument [Line Items]
Stated interest rate								3.95%
PG&E Corporation | Utility Reinstated Senior Notes
Debt Instrument [Line Items]
Debt, outstanding								$ 9,575,000,000		9,575,000,000
PG&E Corporation | Utility Funded Debt
Debt Instrument [Line Items]
Debt, face value								$ 1,949,000,000
Stated interest rate								3.15%
PG&E Corporation | New Utility Funded Debt Exchange Notes
Debt Instrument [Line Items]
Issuance										$ 3,900,000,000
Debt, face value								$ 1,949,000,000
Stated interest rate								4.50%