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COMMITMENTS, GUARANTEES, PRODUCT WARRANTIES AND OTHER LOSS CONTINGENCIES - Alstom Legacy Matters (Details)
€ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Nov. 30, 2015
significant_case
Dec. 31, 2014
USD ($)
Jan. 31, 2007
EUR (€)
Dec. 31, 2013
USD ($)
Dec. 31, 2019
USD ($)
Nov. 02, 2015
USD ($)
Alstom Legacy Matters              
Loss Contingencies [Line Items]              
Number of significant cases involving anti-competitive activities and improper payments | significant_case   2          
Damages sought | €       € 65      
Reduced fine | €       € 59      
Amount paid     $ 772        
Reserve established for legal and compliance matters $ 856         $ 875 $ 858
Siemens AG              
Loss Contingencies [Line Items]              
Damages sought         $ 950    
Amount paid $ 47            
ABB Ltd.              
Loss Contingencies [Line Items]              
Damages sought         $ 600