FINANCIAL INSTRUMENTS (Schedule of Fair Values of Derivative Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	$ 26	$ 21
Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	222	273
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	104	121
Derivative Asset	118	152
Derivative Liability, Fair Value, Gross Liability	439	512
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	119	140
Derivative Liability	320	372
Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	138	141
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	66	55
Derivative Asset	72	86
Derivative Liability, Fair Value, Gross Liability	331	352
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	79	73
Derivative Liability	252	279
Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	84	132
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	38	66
Derivative Asset	46	66
Derivative Liability, Fair Value, Gross Liability	108	160
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	40	67
Derivative Liability	68	93
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	65	51
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	61	46
Derivative Asset	4	5
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] | Accounts and Notes Receivable Other [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	51	75
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	34	58
Derivative Asset	17	17
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] | Accrued and Other Current Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	99	109
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	61	46
Derivative Liability	38	63
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] | Accounts Payable Other [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	67	107
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	34	58
Derivative Liability	33	49
Fair Value, Inputs, Level 2 [Member] | Commodity Contract [Member] | Other Current Assets [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	13	20
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	2	4
Derivative Asset	11	16
Fair Value, Inputs, Level 2 [Member] | Commodity Contract [Member] | Other Current Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	26	50
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	3	5
Derivative Asset	23	45
Fair Value, Inputs, Level 2 [Member] | Commodity Contract [Member] | Deferred charges and other assets [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	60	70
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	3	5
Derivative Asset	57	65
Fair Value, Inputs, Level 2 [Member] | Commodity Contract [Member] | Deferred charges and other assets [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	7	7
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	1	3
Derivative Asset	6	4
Fair Value, Inputs, Level 2 [Member] | Commodity Contract [Member] | Accrued and Other Current Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	8	96
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	8	15
Derivative Liability	0	81
Fair Value, Inputs, Level 2 [Member] | Commodity Contract [Member] | Accrued and Other Current Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	32	45
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	5	6
Derivative Liability	27	39
Fair Value, Inputs, Level 2 [Member] | Commodity Contract [Member] | Other Noncurrent Obligations [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	221	143
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	10	12
Derivative Liability	211	131
Fair Value, Inputs, Level 2 [Member] | Commodity Contract [Member] | Other Noncurrent Obligations [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	9	8
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	1	3
Derivative Liability	8	5
Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member] | Accrued and Other Current Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	3	4
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	0	0
Derivative Liability	$ 3	$ 4