FAIR VALUE MEASUREMENTS (Basis of Fair Value Measurements on a Recurring Basis) (Details) - USD ($) $ in Millions		Jun. 30, 2017		Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral Already Posted, Aggregate Fair Value		$ 44		$ 1
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	[1],[2]	0		0
Carrying value of interests held	[1],[3]	0		0
Assets, Fair Value Disclosure	[4]	166		130
Long-term Debt, Fair Value	[1],[5]	0		0
Liabilities, Fair Value Disclosure	[1]	188		130
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[1],[6]	0		0
US Treasury and Government [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[1],[6],[7]	0		0
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[1],[6]	0		0
Quoted Prices in Active Markets for Identical Items (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure		0	[2]	0	[8]
Carrying value of interests held		0	[3]	0	[9]
Commodities, Asset		23	[10]	48	[11]
Foreign currency, Asset		0	[10]	0	[11]
Assets, Fair Value Disclosure		679		667
Long-term Debt, Fair Value		0	[5]	0	[12]
Interest Rate Derivative Liabilities, at Fair Value		0	[10]	0	[11]
Commodities, Liability		28	[10]	20	[11]
Foreign currency, Liability		0	[10]	0	[11]
Liabilities, Fair Value Disclosure		28		20
Quoted Prices in Active Markets for Identical Items (Level 1) [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		656	[6]	619	[13]
Quoted Prices in Active Markets for Identical Items (Level 1) [Member] | US Treasury and Government [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	[6],[7]	0	[13],[14]
Quoted Prices in Active Markets for Identical Items (Level 1) [Member] | Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	[6]	0	[13]
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure		1,159	[2]	500	[8]
Carrying value of interests held		0	[3]	0	[9]
Commodities, Asset		54	[10]	29	[11]
Foreign currency, Asset		175	[10]	193	[11]
Assets, Fair Value Disclosure		2,731		2,062
Long-term Debt, Fair Value		23,239	[5]	22,807	[12]
Interest Rate Derivative Liabilities, at Fair Value		5	[10]	5	[11]
Commodities, Liability		279	[10]	214	[11]
Foreign currency, Liability		332	[10]	139	[11]
Liabilities, Fair Value Disclosure		23,855		23,165
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		89	[6]	87	[13]
Fair Value, Inputs, Level 2 [Member] | US Treasury and Government [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		617	[6],[7]	608	[13],[14]
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		637	[6]	645	[13]
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure		0	[2]	0	[8]
Carrying value of interests held		1,684	[3]	1,237	[9]
Commodities, Asset		0	[10]	0	[11]
Foreign currency, Asset		0	[10]	0	[11]
Assets, Fair Value Disclosure		1,684		1,237
Long-term Debt, Fair Value		0	[5]	0	[12]
Interest Rate Derivative Liabilities, at Fair Value		0	[10]	0	[11]
Commodities, Liability		0	[10]	0	[11]
Foreign currency, Liability		0	[10]	0	[11]
Liabilities, Fair Value Disclosure		0		0
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	[6]	0	[13]
Significant Unobservable Inputs (Level 3) [Member] | US Treasury and Government [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	[6],[7]	0	[13],[14]
Significant Unobservable Inputs (Level 3) [Member] | Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	[6]	0	[13]
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1],[10]	0		0
Foreign Currency Contract [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1],[10]	(150)		(109)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1],[10]	(150)		(109)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1],[10]	(16)		(21)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1],[10]	(38)		(21)
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	[2]	1,159		500
Carrying value of interests held	[3]	1,684		1,237
Commodities, Asset	[10]	61		56
Foreign currency, Asset	[10]	25		84
Assets, Fair Value Disclosure		4,928		3,836
Long-term Debt, Fair Value	[5]	23,239		22,807
Interest Rate Derivative Liabilities, at Fair Value	[10]	5		5
Commodities, Liability	[10]	269		213
Foreign currency, Liability	[10]	182		30
Liabilities, Fair Value Disclosure		23,695		23,055
Estimate of Fair Value Measurement [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[6]	745		706
Estimate of Fair Value Measurement [Member] | US Treasury and Government [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[6],[7]	617		608
Estimate of Fair Value Measurement [Member] | Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	[6]	$ 637		$ 645

[1] Counterparty and cash collateral amounts represent the estimated net settlement amount when applying netting and set-off rights included in master netting arrangements between the Company and its counterparties and the cash collateral placed with the same counterparty.

[2] Treasury Bills and money market funds included in "Cash and cash equivalents" in the consolidated balance sheets and held at amortized cost, which approximates fair value.

[3] Included in “Accounts and notes receivable – Other” in the consolidated balance sheets. See Note 11 for additional information on transfers of financial assets.

[4] Counterparty and cash collateral amounts represent the estimated net settlement amount when applying netting and set-off rights included in master netting arrangements between the Company and its counterparties and the cash collateral placed with the same counterparty.

[5] See Note 7 for information on fair value measurements of long-term debt.

[6] The Company’s investments in equity and debt securities are primarily classified as available-for-sale and are included in “Other investments” in the consolidated balance sheets.

[7] U.S. Treasury obligations, U.S. agency obligations, agency mortgage-backed securities and other municipalities’ obligations.

[8] Treasury Bills and money market funds included in "Cash and cash equivalents" in the consolidated balance sheets and held at amortized cost, which approximates fair value.

[9] Included in “Accounts and notes receivable – Other” in the consolidated balance sheets. See Note 11 for additional information on transfers of financial assets.

[10] See Note 7 for the classification of derivatives in the consolidated balance sheets.

[11] See Note 7 for the classification of derivatives in the consolidated balance sheets.

[12] See Note 7 for information on fair value measurements of long-term debt.

[13] The Company’s investments in equity and debt securities are primarily classified as available-for-sale and are included in “Other investments” in the consolidated balance sheets.

[14] U.S. Treasury obligations, U.S. agency obligations, agency mortgage-backed securities and other municipalities’ obligations.