FINANCIAL INSTRUMENTS (Summary of Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Cash Equivalents, at Carrying Value	$ 628	$ 566
Cash Equivalents, Accumulated Gross Unrealized Loss, Before Tax	0	0
Cash Equivalents, Accumulated Gross Unrealized Loss, Before Tax	0	0
Cash Equivalents, Fair Value	628	566
Total, Amortized Cost	1,477	1,740
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	113	29
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(21)	(86)
Debt Securities, Available-for-sale	1,569	1,683
Other Investments and Securities, at Cost	1,487	1,756
Other Investments and Securities, Accumulated Gross Unrealized Gain, Before Tax	119	30
Other Investments and Securities, Accumulated Gross Unrealized Loss, Before Tax	(22)	(87)
Other Investments	1,584	1,699
Cash Equivalents, Marketable Securities and Other Investments, Amortized Cost Basis	2,136	2,422
Cash Equivalents, Marketable Securities and Other Investments, Accumulated Gross Unrealized Gain, Before Tax	119	30
Cash Equivalents, Marketable Securities and Other Investments, Accumulated Gross Unrealized Loss, Before Tax	(22)	(87)
Cash Equivalents, Marketable Securities and Other Investments, Fair Value	2,233	2,365
Long-term Debt	(16,410)	(19,591)
Long Term Debt, Accumulated Gross Unrealized Gain, Before Tax	7	351
Long Term Debt, Accumulated Gross Unrealized Loss, Before Tax	(2,258)	(972)
Long-term debt	(18,661)	(20,212)
Derivative Assets (Liabilities), Accumulated Gross Unrealized Gain, Before Tax	168	211
Derivative Assets (Liabilities), Accumulated Gross Unrealized Loss, Before Tax	(419)	(285)
Derivative Assets (Liabilities), at Fair Value, Net	(251)	(74)
Long Term Debt, Accumulated Fair Value Adjustment	1	18
Derivative, Amount of Hedged Item	3,490	2,290
Interest rates 6
Debt Securities, Available-for-sale [Line Items]
Derivative Assets (Liabilities), Accumulated Gross Unrealized Gain, Before Tax	8	0
Derivative Assets (Liabilities), Accumulated Gross Unrealized Loss, Before Tax	(283)	(64)
Derivative Assets (Liabilities), at Fair Value, Net	(275)	(64)
Foreign currency
Debt Securities, Available-for-sale [Line Items]
Derivative Assets (Liabilities), Accumulated Gross Unrealized Gain, Before Tax	101	120
Derivative Assets (Liabilities), Accumulated Gross Unrealized Loss, Before Tax	(21)	(43)
Derivative Assets (Liabilities), at Fair Value, Net	80	77
Commodities
Debt Securities, Available-for-sale [Line Items]
Derivative Assets (Liabilities), Accumulated Gross Unrealized Gain, Before Tax	59	91
Derivative Assets (Liabilities), Accumulated Gross Unrealized Loss, Before Tax	(115)	(178)
Derivative Assets (Liabilities), at Fair Value, Net	(56)	(87)
Government debt
Debt Securities, Available-for-sale [Line Items]
Total, Amortized Cost	533	714
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	33	9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(11)	(23)
Debt Securities, Available-for-sale	555	700
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total, Amortized Cost	944	1,026
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	80	20
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(10)	(63)
Debt Securities, Available-for-sale	1,014	983
Equity securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis	10	16
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	6	1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	(1)	(1)
Equity securities	15	16
Held-to-maturity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Cash Equivalents, at Carrying Value	220	410
Cash Equivalents, Accumulated Gross Unrealized Loss, Before Tax	0	0
Cash Equivalents, Accumulated Gross Unrealized Loss, Before Tax	0	0
Cash Equivalents, Fair Value	220	410
Money Market Funds [Member]
Debt Securities, Available-for-sale [Line Items]
Cash Equivalents, at Carrying Value	408	156
Cash Equivalents, Accumulated Gross Unrealized Loss, Before Tax	0	0
Cash Equivalents, Accumulated Gross Unrealized Loss, Before Tax	0	0
Cash Equivalents, Fair Value	408	156
Marketable securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis, Current	21	100
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, Current, before Tax	0	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, Current, before Tax	0	0
Debt Securities, Available-for-sale, Current	$ 21	$ 100