SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) reporting_unit country	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2021 USD ($)	Sep. 22, 2021 USD ($)	May 17, 2021 USD ($)
Long-Lived Assets [Line Items]
Net sales	$ 19,628,000,000	$ 17,858,000,000	$ 21,390,000,000
Countries where products are sold (more than) | country	170
Investments in associate companies	$ 777,000,000	680,000,000
Revolving Credit Facility
Long-Lived Assets [Line Items]
Credit facility, maximum borrowing capacity					$ 2,500,000,000	$ 4,500,000,000
Revolving Credit Facility | 364 Day Credit Facility
Long-Lived Assets [Line Items]
Credit facility, maximum borrowing capacity	500,000,000			$ 500,000,000	$ 500,000,000	$ 2,500,000,000
Revolving Credit Facility | Five Year Credit Facility
Long-Lived Assets [Line Items]
Credit facility, maximum borrowing capacity	$ 2,000,000,000			$ 750,000,000
Other postretirement benefits plans
Long-Lived Assets [Line Items]
Defined benefit plan, amortization period of gain (loss)	7 years
Aerospace Segment
Long-Lived Assets [Line Items]
Net sales	$ 2,648,000,000	$ 2,223,000,000	$ 2,480,000,000
Number of reporting units | reporting_unit	2
United States | Pension plans
Long-Lived Assets [Line Items]
Defined benefit plan, amortization period of gain (loss)	23 years
Foreign Plan | Pension plans
Long-Lived Assets [Line Items]
Defined benefit plan, amortization period of gain (loss)	10 years
Patents and technology
Long-Lived Assets [Line Items]
Weighted-average amortization period of finite-lived intangible assets	18 years
Customer relationships
Long-Lived Assets [Line Items]
Weighted-average amortization period of finite-lived intangible assets	18 years
Trademarks
Long-Lived Assets [Line Items]
Weighted-average amortization period of finite-lived intangible assets	18 years
Buildings
Long-Lived Assets [Line Items]
Useful life of property, plant and equipment	40 years
Minimum
Long-Lived Assets [Line Items]
Ownership interest in equity method investment (as a percent)	20.00%
Other postretirement benefits plans, accounting corridor for amortization of net actuarial gains (losses) (as a percent)	8.00%
Minimum | Machinery and equipment
Long-Lived Assets [Line Items]
Useful life of property, plant and equipment	3 years
Minimum | Software
Long-Lived Assets [Line Items]
Useful life of property, plant and equipment	5 years
Maximum
Long-Lived Assets [Line Items]
Ownership interest in equity method investment (as a percent)	50.00%
Other postretirement benefits plans, accounting corridor for amortization of net actuarial gains (losses) (as a percent)	10.00%
Maximum | Machinery and equipment
Long-Lived Assets [Line Items]
Useful life of property, plant and equipment	10 years
Maximum | Software
Long-Lived Assets [Line Items]
Useful life of property, plant and equipment	15 years