FINANCIAL INSTRUMENTS (Notional Amounts) (Details) bbl in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) MWh bbl	Dec. 31, 2018 USD ($) MWh bbl
Derivatives designated as hedging instruments: | Interest rates
Derivative [Line Items]
Derivative, Notional Amount	$ 922	$ 2,049
Derivatives designated as hedging instruments: | Foreign currency
Derivative [Line Items]
Derivative, Notional Amount	$ 6,253	$ 4,457
Derivatives designated as hedging instruments: | Hydrocarbon derivatives
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | bbl	6.1	39.9
Derivatives not designated as hedging instruments: | Interest rates
Derivative [Line Items]
Derivative, Notional Amount	$ 145	$ 5
Derivatives not designated as hedging instruments: | Foreign currency
Derivative [Line Items]
Derivative, Notional Amount	$ 5,567	$ 19,285
Derivatives not designated as hedging instruments: | Hydrocarbon derivatives
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | bbl	0.1	1.2
Derivatives not designated as hedging instruments: | Power derivatives
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MWh	87.5	73.9