INCOME TAXES (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Total UTB that, if recognized, would impact the effective income tax rate as of the end of the year	$ 5,000,000
Decrease in unrecognized tax benefits is reasonably possible	50,000,000
Income tax examination, penalties and interest expense (immaterial)	0	$ 0	$ 0
Pacific Gas & Electric Co
Income Tax Contingency [Line Items]
Tax Cuts and Jobs Act, measurement period adjustment, income tax benefit	$ 13,000,000