FINANCIAL INSTRUMENTS - Effects of Derivative Financial Instruments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Revenues	$ 17,750,000,000	$ 23,414,000,000	$ 38,273,000,000	$ 45,616,000,000
Cost of sales	15,083,000,000	17,412,000,000	30,778,000,000	33,620,000,000
Interest and other financial charges	997,000,000	929,000,000	1,791,000,000	1,993,000,000
SG&A	3,079,000,000	3,425,000,000	6,144,000,000	6,827,000,000
Other income (Note 22)	2,078,000,000	164,000,000	8,947,000,000	1,012,000,000
Fair Value Hedges
Amount excluded for cash flow hedges	7,000,000	0	22,000,000	0
Revenues
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total effect of cash flow hedges	15,000,000	(15,000,000)	(6,000,000)	5,000,000
Fair Value Hedges
Total effect of derivatives not designated as hedges	(107,000,000)	(447,000,000)	(652,000,000)	(62,000,000)
Cost of sales
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total effect of cash flow hedges	(13,000,000)	(5,000,000)	(38,000,000)	(14,000,000)
Fair Value Hedges
Total effect of derivatives not designated as hedges	16,000,000	(31,000,000)	29,000,000	(22,000,000)
Interest Expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total effect of cash flow hedges	(12,000,000)	(9,000,000)	(23,000,000)	(19,000,000)
Fair Value Hedges
Hedged items	(122,000,000)	(659,000,000)	(2,601,000,000)	(1,186,000,000)
Derivatives designated as hedging instruments	109,000,000	646,000,000	2,620,000,000	1,161,000,000
Total effect of fair value hedges	(12,000,000)	(14,000,000)	19,000,000	(25,000,000)
Total effect of derivatives not designated as hedges	(4,000,000)	13,000,000	(13,000,000)	94,000,000
SG&A
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total effect of cash flow hedges	(2,000,000)	0	(5,000,000)	(1,000,000)
Fair Value Hedges
Total effect of derivatives not designated as hedges	201,000,000	(17,000,000)	95,000,000	(62,000,000)
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	(21,000,000)	(39,000,000)	(32,000,000)	(24,000,000)
Interest rate contracts | Revenues
Fair Value Hedges
Total effect of derivatives not designated as hedges	(12,000,000)	(14,000,000)	(35,000,000)	(18,000,000)
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	(4,000,000)	(14,000,000)	(13,000,000)	(29,000,000)
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	(95,000,000)	(433,000,000)	(616,000,000)	(43,000,000)
Currency exchange contracts | Cost of sales
Fair Value Hedges
Total effect of derivatives not designated as hedges	16,000,000	(31,000,000)	29,000,000	(22,000,000)
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	104,000,000	(17,000,000)	159,000,000	(62,000,000)
Currency exchange contracts | Other Income
Fair Value Hedges
Total effect of derivatives not designated as hedges	(32,000,000)	(27,000,000)	(21,000,000)	(25,000,000)
Other | Revenues
Fair Value Hedges
Total effect of derivatives not designated as hedges	0	0	0	0
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	27,000,000	0	123,000,000
Other | SG&A
Fair Value Hedges
Total effect of derivatives not designated as hedges	97,000,000	0	(63,000,000)	0
Other | Other Income
Fair Value Hedges
Total effect of derivatives not designated as hedges	$ 11,000,000	$ (12,000,000)	$ (11,000,000)	$ 1,000,000