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OTHER CONTINGENCIES AND COMMITMENTS (Other Matters) (Details) - USD ($)
$ in Millions
Jun. 23, 2016
Dec. 31, 2018
Pacific Gas & Electric Co    
Loss Contingencies [Line Items]    
Accrued legal liabilities   $ 98
Disallowance of Plant Costs    
Loss Contingencies [Line Items]    
Gas transmission and storage capital disallowance $ 696  
Permanently disallowed capital 120  
Amount subject to audit $ 576