FAIR VALUE MEASUREMENTS (Basis of Fair Value Measurements on a Recurring Basis) (Details) - USD ($) $ in Millions		Sep. 30, 2016		Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral Already Posted, Aggregate Fair Value		$ 14		$ 26
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]	34		53
Long-term Debt, Fair Value	[1],[5]	0		0
Liabilities, Fair Value Disclosure	[1]	40		66
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		16	[10]	5	[11]
Foreign currency, Asset		0	[10]	0	[11]
Assets, Fair Value Disclosure		633		569
Long-term Debt, Fair Value		0	[5]	0	[12]
Interest Rate Derivative Liabilities, at Fair Value		0	[10]	0	[11]
Commodities, Liability		9	[10]	6	[11]
Foreign currency, Liability		0	[10]	0	[11]
Liabilities, Fair Value Disclosure		9		6
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		617	[6]	564	[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		1,155	[2]	5,043	[8]
Carrying value of interests held		0	[3]	0	[9]
Commodities, Asset		4	[10]	2	[11]
Foreign currency, Asset		46	[10]	161	[11]
Assets, Fair Value Disclosure		2,599		6,508
Long-term Debt, Fair Value		23,578	[5]	18,000	[12]
Interest Rate Derivative Liabilities, at Fair Value		8	[10]	4	[11]
Commodities, Liability		249	[10]	256	[11]
Foreign currency, Liability		65	[10]	84	[11]
Liabilities, Fair Value Disclosure		23,900		18,344
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		91	[6]	39	[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		635	[6],[7]	612	[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		668	[6]	651	[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		1,500	[3]	943	[9]
Commodities, Asset		0	[10]	0	[11]
Foreign currency, Asset		0	[10]	0	[11]
Assets, Fair Value Disclosure		1,500		943
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]	(29)		(52)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1],[10]	(29)		(52)
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]	(5)		(1)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1],[10]	(11)		(14)
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]	1,155		5,043
Carrying value of interests held	[3]	1,500		943
Commodities, Asset	[10]	15		6
Foreign currency, Asset	[10]	17		109
Assets, Fair Value Disclosure		4,698		7,967
Long-term Debt, Fair Value	[5]	23,578		18,000
Interest Rate Derivative Liabilities, at Fair Value	[10]	8		4
Commodities, Liability	[10]	247		248
Foreign currency, Liability	[10]	36		32
Liabilities, Fair Value Disclosure		23,869		18,284
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]	708		603
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]	635		612
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]	$ 668		$ 651

[1] 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 payable or receivable for cash collateral held or 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 12 for additional information on transfers of financial assets.

[4] 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 payable or receivable for cash collateral held or placed with the same counterparty.

[5] See Note 8 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 12 for additional information on transfers of financial assets.

[10] See Note 8 for the classification of derivatives in the consolidated balance sheets.

[11] See Note 8 for the classification of derivatives in the consolidated balance sheets.

[12] See Note 8 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.