The net result for the period of deducting operating expenses from operating revenues.

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Name:	us-gaap_OperatingIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

OTHER CONTINGENCIES AND COMMITMENTS (Tax Matters) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Decrease in net operating loss	$ (304)	$ (398)	$ (1,242)	$ (1,335)
Fire Victim Trust
Disaggregation of Revenue [Line Items]
Cash transferred					$ 5,400
Common stock transferred					4,540
Aggregate transferred					10,000
Decrease in net operating loss					10,000
Deferred tax assets charge					$ 1,300