FINANCIAL INSTRUMENTS - Effects of Derivative Financial Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total revenues	$ 17,118	$ 19,490
Cost of sales	12,538	14,426
Interest and other financial charges	500	561
SG&A	2,891	3,061
Other income (Note 23)	626	6,869
Fair Value Hedges
Gain (loss) excluded for cash flow hedges	(16)	15
Revenues
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total effect of cash flow hedges	(21)	(21)
Fair Value Hedges
Total effect of derivatives not designated as hedges	305	(547)
Cost of sales
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total effect of cash flow hedges	(4)	(25)
Fair Value Hedges
Total effect of derivatives not designated as hedges	0	13
Interest Expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total effect of cash flow hedges	(8)	(10)
Fair Value Hedges
Hedged items	1,843	(2,480)
Derivatives designated as hedging instruments	(1,899)	2,511
Total effect of fair value hedges	(56)	31
Total effect of derivatives not designated as hedges	(9)	(9)
SG&A
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total effect of cash flow hedges	0	(3)
Fair Value Hedges
Total effect of derivatives not designated as hedges	114	(106)
Other Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total effect of cash flow hedges	0	0
Fair Value Hedges
Total effect of derivatives not designated as hedges	56	(12)
Interest rate contracts | Revenues
Fair Value Hedges
Total effect of derivatives not designated as hedges	1	(26)
Interest rate contracts | Cost of sales
Fair Value Hedges
Total effect of derivatives not designated as hedges	0	0
Interest rate contracts | Interest Expense
Fair Value Hedges
Total effect of derivatives not designated as hedges	(9)	(9)
Interest rate contracts | SG&A
Fair Value Hedges
Total effect of derivatives not designated as hedges	0	0
Interest rate contracts | Other Income
Fair Value Hedges
Total effect of derivatives not designated as hedges	(1)	0
Currency exchange contracts | Revenues
Fair Value Hedges
Total effect of derivatives not designated as hedges	303	(521)
Currency exchange contracts | Cost of sales
Fair Value Hedges
Total effect of derivatives not designated as hedges	0	13
Currency exchange contracts | Interest Expense
Fair Value Hedges
Total effect of derivatives not designated as hedges	0	0
Currency exchange contracts | SG&A
Fair Value Hedges
Total effect of derivatives not designated as hedges	59	54
Currency exchange contracts | Other Income
Fair Value Hedges
Total effect of derivatives not designated as hedges	38	11
Other | Revenues
Fair Value Hedges
Total effect of derivatives not designated as hedges	0	0
Other | Cost of sales
Fair Value Hedges
Total effect of derivatives not designated as hedges	0	0
Other | Interest Expense
Fair Value Hedges
Total effect of derivatives not designated as hedges	0	0
Other | SG&A
Fair Value Hedges
Total effect of derivatives not designated as hedges	55	(160)
Other | Other Income
Fair Value Hedges
Total effect of derivatives not designated as hedges	$ 19	$ (22)