OTHER CONTINGENCIES AND COMMITMENTS (Order Instituting Investigation Narrative) (Details) $ in Millions	Jan. 04, 2021 party	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 08, 2020 party	Apr. 20, 2020 USD ($)	Dec. 17, 2019 USD ($)
Loss Contingencies [Line Items]
Expenses and capital expenditures, disallowed costs			$ 1,625
Expenses and capital expenditures, disallowed capital, approved					$ 198
Shareholder-funded system enhancement initiatives, approved					64
Fine payable to general fund, suspended					200
Number of parties filed separate applications for rehearing | party				2
Wildfire mitigation plan memorandum account
Loss Contingencies [Line Items]
Expenses and capital expenditures, disallowed capital, approved					$ 198
Subsequent Event
Loss Contingencies [Line Items]
Number of parties filed petition for review of the CUPC decision | party	1
Pacific Gas & Electric Co (Utility)
Loss Contingencies [Line Items]
Expenses and capital expenditures			1,625
Pacific Gas & Electric Co (Utility) | Wildfire mitigation plan memorandum account
Loss Contingencies [Line Items]
Expenses and capital expenditures, charges recorded			$ 152
Pacific Gas & Electric Co (Utility) | Forecast | Wildfire mitigation plan memorandum account
Loss Contingencies [Line Items]
Expenses and capital expenditures, charges recorded		$ 46
Pacific Gas & Electric Co (Utility) | Pending Litigation | Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Expenses and capital expenditures						$ 1,625
Shareholder-funded system enhancement initiatives, amount						$ 50