FINANCIAL INSTRUMENTS (Derivatives) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	$ 6		$ 6		$ 21
Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(30)		(30)		(3)
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	(1)		(1)
Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	9		9
Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months	(22)		(22)
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,536		2,536
Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	458		458		273
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(116)		(116)		(121)
Derivative Asset	342		342		152
Derivative Liability, Fair Value, Gross Liability	403		403		512
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	117		117		140
Derivative Liability	286		286		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	316		316		141
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(49)		(49)		(55)
Derivative Asset	267		267		86
Derivative Liability, Fair Value, Gross Liability	293		293		352
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	50		50		73
Derivative Liability	243		243		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	142		142		132
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(67)		(67)		(66)
Derivative Asset	75		75		66
Derivative Liability, Fair Value, Gross Liability	110		110		160
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	67		67		67
Derivative Liability	43		43		93
Deferred charges and other assets [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	1		1
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(1)		(1)
Deferred charges and other assets [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	104		104		70
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(2)		(2)		(5)
Derivative Asset	102		102		65
Deferred charges and other assets [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	6		6		7
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(1)		(1)		(3)
Derivative Asset	5		5		4
Accounts and Notes Receivable Other [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	129		129		75
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(62)		(62)		(58)
Derivative Asset	67		67		17
Other Current Assets [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	158		158		51
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(42)		(42)		(46)
Derivative Asset	116		116		5
Other Current Assets [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	53		53		20
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(4)		(4)		(4)
Derivative Asset	49		49		16
Other Current Assets [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	7		7		50
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(4)		(4)		(5)
Derivative Asset	3		3		45
Accrued and Other Current Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	40		40		4
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	1		1		0
Derivative Liability	39		39		4
Accrued and Other Current Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	44		44		109
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	42		42		46
Derivative Liability	2		2		63
Accrued and Other Current Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	94		94		96
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	5		5		15
Derivative Liability	89		89		81
Accrued and Other Current Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	6		6		45
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	4		4		6
Derivative Liability	2		2		39
Other Noncurrent Obligations [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	115		115		143
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	2		2		12
Derivative Liability	113		113		131
Other Noncurrent Obligations [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	9		9		8
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	1		1		3
Derivative Liability	8		8		5
Accounts Payable Other [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	95		95		107
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	62		62		58
Derivative Liability	33		33		$ 49
Other Nonoperating Income (Expense) [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 82	$ (193)	$ 65	$ (160)