FINANCIAL INSTRUMENTS - Summary of Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 1,396	$ 1,888
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	49	138
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(37)	(67)
Available-for-sale Securities	1,408	1,959
Long-term Debt	(20,582)	(21,091)
Long Term Debt, Accumulated Gross Unrealized Gain, Before Tax	0	129
Long Term Debt, Accumulated Gross Unrealized Loss, Before Tax	(2,175)	(1,845)
Long-term Debt, Fair Value	(22,757)	(22,807)
Long Term Debt, Fair Value Adjustment	12	18
Interest Rate Swap [Member]
Schedule of Available-for-sale Securities [Line Items]
Financial Instruments Amortized Cost	0	0
Derivative Liability, Accumulated Unrealized Gain, Before Tax	0	0
Derivative Liability, Accumulated Unrealized Loss, Before Tax	(4)	(5)
Derivative Assets (Liabilities), at Fair Value, Net	(4)	(5)
Commodity Contract [Member]
Schedule of Available-for-sale Securities [Line Items]
Financial Instruments Amortized Cost	0	0
Derivative Liability, Accumulated Unrealized Gain, Before Tax	124	56
Derivative Liability, Accumulated Unrealized Loss, Before Tax	(277)	(213)
Derivative Assets (Liabilities), at Fair Value, Net	(153)	(157)
Foreign Exchange Contract [Member]
Schedule of Available-for-sale Securities [Line Items]
Financial Instruments Amortized Cost	0	0
Derivative Assets (Liabilities), at Fair Value, Net	(77)	54
Derivative Asset,Accumulated Unrealized Gain, Before Tax	55	84
Derivative Asset, Accumulated Unrealized Loss, Before Tax	(132)	(30)
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	597	607
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	14	13
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(8)	(12)
Available-for-sale Securities	603	608
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,227	1,230
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	46	40
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(10)	(17)
Available-for-sale Securities	1,263	1,253
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	630	623
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	32	27
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(2)	(5)
Available-for-sale Securities	660	645
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	169	658
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	3	98
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(27)	(50)
Available-for-sale Securities	$ 145	$ 706