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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
Nov. 02, 2015
USD ($)
significant_case
Dec. 31, 2014
USD ($)
Jan. 31, 2007
EUR (€)
Dec. 31, 2013
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Alstom Legacy Matters            
Loss Contingencies [Line Items]            
Number of significant cases involving anti-competitive activities and improper payments | significant_case 2          
Fine for participating in gas insulated switchgear cartel | €     € 65      
Reduced fine | €     € 59      
Criminal penalty paid   $ 772        
Reserve established for legal and compliance matters $ 858       $ 846 $ 875
Siemens AG            
Loss Contingencies [Line Items]            
Fine for participating in gas insulated switchgear cartel       $ 950    
ABB Ltd.            
Loss Contingencies [Line Items]            
Fine for participating in gas insulated switchgear cartel       $ 600