OTHER CONTINGENCIES AND COMMITMENTS (Order Instituting Investigation Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Apr. 20, 2020	Dec. 17, 2019
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
Wildfire mitigation plan memorandum account
Loss Contingencies [Line Items]
Expenses and capital expenditures, disallowed capital, approved	198
Pacific Gas & Electric Co (Utility)
Loss Contingencies [Line Items]
Expenses and capital expenditures	1,625
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