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Proposed Merger With GE Transportation (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Oct. 12, 2018
Sep. 14, 2018
Jun. 08, 2018
Business Acquisition [Line Items]        
Debt issued     $ 2,500,000,000.0  
Floating Rate Senior Notes | Senior Notes        
Business Acquisition [Line Items]        
Debt issued     500,000,000  
Senior Notes due 2024 | Senior Notes        
Business Acquisition [Line Items]        
Debt issued     750,000,000.0  
Senior Notes due 2028 | Senior Notes        
Business Acquisition [Line Items]        
Debt issued     $ 1,250,000,000.00  
Delayed Draw Term Loan | Line of Credit        
Business Acquisition [Line Items]        
Delayed draw term loan       $ 400,000,000
Scenario Forecast | GE Transportation        
Business Acquisition [Line Items]        
Cash payment for acquisition $ 2,900,000,000      
Outstanding shares retained (as a percent) 49.90%      
Equity issued in acquisition $ 9,398,000,000      
Business combination, consideration transferred $ 12,800,000,000      
Scenario Forecast | GE and Pre-Merger Holders | GE Transportation        
Business Acquisition [Line Items]        
Outstanding shares transferred (as a percent) 50.10%      
Scenario Forecast | General Electric Company | GE Transportation        
Business Acquisition [Line Items]        
Outstanding shares transferred (as a percent) 9.90%      
Cash to be received $ 3,370,000,000      
Subsequent Event | GE Transportation        
Business Acquisition [Line Items]        
Closing sale price (in dollars per share)   $ 95.43    
Minimum | Scenario Forecast | General Electric Company | GE Transportation        
Business Acquisition [Line Items]        
Period for reverting shares 2 years      
Maximum | Scenario Forecast | General Electric Company | GE Transportation        
Business Acquisition [Line Items]        
Period for reverting shares 3 years