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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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