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ACQUISITIONS - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions					12 Months Ended
	Mar. 31, 2021	Sep. 12, 2019	Aug. 09, 2019	Feb. 25, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	May 06, 2019	Apr. 30, 2019	Feb. 22, 2019
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares)					185,800,000	188,900,000
Preferred stock, shares outstanding (in shares)					0
Stock and cash paid					$ 440	$ 41	$ 10,116
Common stock, shares issued (in shares)					226,900,000	226,900,000
Preferred stock, shares issued (in shares)					0	0
Common Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)								3,515,500
General Electric Company
Business Acquisition [Line Items]
Stock and cash paid				$ 2,885
Common stock, shares issued (in shares)				19,018,207
Preferred stock, shares issued (in shares)				10,000
General Electric Company | General Electric Company
Business Acquisition [Line Items]
Common stock, shares issued (in shares)				46,763,975
Nordco
Business Acquisition [Line Items]
Percentage of voting interests acquired	100.00%
Business combination, consideration transferred	$ 410
GE Transportation
Business Acquisition [Line Items]
Business combination, consideration transferred				$ 10,300
Consideration transferred				2,875
Stock and cash paid				$ 470	$ 99	$ 115
Purchase price per share (in euros per share)										$ 73.36
Change in estimated fair values for assets acquired					$ 3	$ 48	$ 63
GE Transportation | General Electric Company
Business Acquisition [Line Items]
Percentage of outstanding shares transferred				9.90%
GE Transportation | GE and Pre-Merger Holders
Business Acquisition [Line Items]
Percentage of outstanding shares transferred				49.20%
GE Transportation | SpinCo Class B Preferred Stock
Business Acquisition [Line Items]
Stock and cash paid				$ 10
GE Transportation | Convertible Preferred Stock
Business Acquisition [Line Items]
Shares issuable (in shares)				10,000
GE Transportation | Convertible Preferred Stock | General Electric Company
Business Acquisition [Line Items]
Percentage of outstanding shares transferred				15.00%
GE Transportation | General Electric Company | SpinCo Common Stock
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares)				8,700,000,000
GE Transportation | General Electric Company | SpinCo Class A Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)				15,000
GE Transportation | General Electric Company | SpinCo Class B Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)				10,000
GE Transportation | General Electric Company | SpinCo Class C Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)				1
GE Transportation | General Electric Company | Series A Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)								8,780
GE Transportation | General Electric Company | Common Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)								25,300,000
Number of shares issued in transaction (in shares)		2,048,515	16,969,656
GE Transportation | Pre-merger Wabtec Stockholders
Business Acquisition [Line Items]
Percentage of outstanding shares transferred				50.80%
GE Transportation | Wabtec | SpinCo Class B Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)				10,000
GET Brazil
Business Acquisition [Line Items]
Noncontrolling interest acquired									$ 56
General Electric Company
Business Acquisition [Line Items]
Noncontrolling interest acquired				$ 88
Other noncurrent liabilities				667
General Electric Company | Customer Contracts
Business Acquisition [Line Items]
Other noncurrent liabilities				$ 525

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