FINANCIAL INSTRUMENTS - Effects of Derivative Financial Instruments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Revenues	$ 19,417	$ 23,360	$ 57,690	$ 68,976
Cost of sales	15,275	17,328	46,054	50,949
Interest and other financial charges	745	1,279	2,536	3,272
SG&A	3,227	3,293	9,371	10,120
Other income (Note 22)	(517)	158	8,430	1,170
Fair Value Hedges
Amount excluded for cash flow hedges	8	0	30	0
Revenues
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total effect of cash flow hedges	68	(24)	62	(18)
Fair Value Hedges
Total effect of derivatives not designated as hedges	174	(172)	(478)	(234)
Cost of sales
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total effect of cash flow hedges	(14)	(1)	(52)	(14)
Fair Value Hedges
Total effect of derivatives not designated as hedges	10	(8)	39	(29)
Interest Expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total effect of cash flow hedges	(9)	(8)	(31)	(27)
Fair Value Hedges
Hedged items	311	(1,000)	(2,290)	(2,186)
Derivatives designated as hedging instruments	(330)	1,011	2,290	2,172
Total effect of fair value hedges	(19)	10	0	(14)
Total effect of derivatives not designated as hedges	(3)	(11)	(16)	83
SG&A
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total effect of cash flow hedges	6	(2)	1	(3)
Fair Value Hedges
Total effect of derivatives not designated as hedges	(81)	60	14	(2)
Other Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total effect of cash flow hedges	0	0	0	0
Fair Value Hedges
Total effect of derivatives not designated as hedges	85	(18)	53	(42)
Interest rate contracts | Revenues
Fair Value Hedges
Total effect of derivatives not designated as hedges	0	(7)	(35)	(25)
Interest rate contracts | Cost of sales
Fair Value Hedges
Total effect of derivatives not designated as hedges	0	0	0	0
Interest rate contracts | Interest Expense
Fair Value Hedges
Total effect of derivatives not designated as hedges	(3)	(10)	(16)	(40)
Interest rate contracts | SG&A
Fair Value Hedges
Total effect of derivatives not designated as hedges	0	0	0	0
Interest rate contracts | Other Income
Fair Value Hedges
Total effect of derivatives not designated as hedges	0	0	0	0
Currency exchange contracts | Revenues
Fair Value Hedges
Total effect of derivatives not designated as hedges	174	(165)	(443)	(208)
Currency exchange contracts | Cost of sales
Fair Value Hedges
Total effect of derivatives not designated as hedges	10	(8)	39	(29)
Currency exchange contracts | Interest Expense
Fair Value Hedges
Total effect of derivatives not designated as hedges	0	0	0	0
Currency exchange contracts | SG&A
Fair Value Hedges
Total effect of derivatives not designated as hedges	(130)	60	29	(2)
Currency exchange contracts | Other Income
Fair Value Hedges
Total effect of derivatives not designated as hedges	35	(28)	14	(52)
Other | Revenues
Fair Value Hedges
Total effect of derivatives not designated as hedges	0	(1)	0	(1)
Other | Cost of sales
Fair Value Hedges
Total effect of derivatives not designated as hedges	0	0	0	0
Other | Interest Expense
Fair Value Hedges
Total effect of derivatives not designated as hedges	0	0	0	123
Other | SG&A
Fair Value Hedges
Total effect of derivatives not designated as hedges	48	0	(15)	0
Other | Other Income
Fair Value Hedges
Total effect of derivatives not designated as hedges	$ 50	$ 9	$ 39	$ 10