WILDFIRE-RELATED CONTINGENCIES (Insurance) (Details) - USD ($) $ in Millions		6 Months Ended
	Jul. 01, 2020	Jun. 30, 2020	Jul. 31, 2020
Insurance Coverage For Wildfire and Non-Wildfire Events | Subsequent event
Loss Contingencies [Line Items]
Costs for insurance coverage	$ 749.0
Insurance Coverage For Wildfire and Non-Wildfire Events | August 1, 2019 - September 2, 2020
Loss Contingencies [Line Items]
Costs for insurance coverage		$ 212.0
Insurance Coverage for Wildfire Events
Loss Contingencies [Line Items]
Liability insurance coverage		430.0
Initial self-insured retention per occurrence		10.0
Insurance Coverage for Wildfire Events | Subsequent event
Loss Contingencies [Line Items]
Liability insurance coverage			$ 757.5
Initial self-insured retention per occurrence			60.0
Insurance Coverage for Wildfire Events | August 1, 2020 - July 31, 2021 | Subsequent event
Loss Contingencies [Line Items]
Liability insurance coverage			715.0
Insurance Coverage for Wildfire Events | July 1, 2020 - June 30, 2021 | Subsequent event
Loss Contingencies [Line Items]
Reinsurance			42.5
Insurance Coverage For Non-Wildfire Events
Loss Contingencies [Line Items]
Liability insurance coverage		1,000.0
Initial self-insured retention per occurrence		10.0
Insurance Coverage For Non-Wildfire Events | August 1, 2019 - July 31, 2020
Loss Contingencies [Line Items]
Liability insurance coverage		520.0
Insurance Coverage For Non-Wildfire Events | September 3, 2019 - September 2, 2020
Loss Contingencies [Line Items]
Liability insurance coverage		480.0
Insurance Coverage For Non-Wildfire Events | August 1, 2020 - July 31, 2021 | Subsequent event
Loss Contingencies [Line Items]
Liability insurance coverage			700.0
Initial self-insured retention per occurrence			$ 10.0
2018 Camp Fire
Loss Contingencies [Line Items]
Estimated insurance recoveries		1,380.0
2017 Northern California wildfires
Loss Contingencies [Line Items]
Estimated insurance recoveries		$ 843.0