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COMMITMENTS, GUARANTEES, PRODUCT WARRANTIES AND OTHER LOSS CONTINGENCIES - Alstom Legacy Legal Matters (Details)
€ in Millions, $ in Millions
1 Months Ended
Nov. 02, 2015
USD ($)
significant_case
Jan. 31, 2017
USD ($)
Dec. 31, 2014
USD ($)
Jan. 31, 2007
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Loss Contingencies [Line Items]            
Reserve balance         $ 858 $ 875
Alstom Legacy Matters            
Loss Contingencies [Line Items]            
Number of significant cases involving anti-competitive activities and improper payments | significant_case 2          
Damages sought   $ 430   € 65    
Reduced fine | €       € 59    
Penalty paid     $ 772      
Reserve established for legal and compliance matters $ 858