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CONTINGENCIES AND COMMITMENTS (Detail) - USD ($)
1 Months Ended 3 Months Ended
Jan. 04, 2018
Oct. 10, 2013
Oct. 31, 2017
Mar. 31, 2018
Dec. 31, 2017
Mar. 29, 2017
Loss Contingencies [Line Items]            
Surety Bond Outstanding       $ 56,000,000    
Damages sought       1,000,000,000    
Malpractice Loss Contingency, Claims Incurred in Period     $ 400,000,000      
Failure to Meet Contractual Obligations [Member]            
Loss Contingencies [Line Items]            
Damages sought   $ 25,000,000        
Standby Letters Of Credit [Member]            
Loss Contingencies [Line Items]            
Letters of credit, outstanding       20,700,000 $ 21,300,000  
FinancialStandbyLetterOfCreditMember            
Loss Contingencies [Line Items]            
Letters of credit, outstanding       15,000,000 14,600,000  
Minimum [Member]            
Loss Contingencies [Line Items]            
Range of possible loss, maximum       0    
Maximum [Member]            
Loss Contingencies [Line Items]            
Range of possible loss, maximum       55,500,000    
Westinghouse Electric Company (WEC) [Member] | Collectibility of Receivables [Member]            
Loss Contingencies [Line Items]            
Range of possible loss, maximum           $ 3,000,000
Pending Litigation [Member] | Westinghouse Electric Company (WEC) [Member]            
Loss Contingencies [Line Items]            
Debtor-in-Possession Financing, Amount Arranged           $ 800,000,000
AP1000 US [Member] | Minimum [Member]            
Loss Contingencies [Line Items]            
Range of possible loss, maximum         $ 0  
AP1000 US [Member] | Maximum [Member]            
Loss Contingencies [Line Items]            
Range of possible loss, maximum       $ 31,000,000    
Westinghouse Electric Company (WEC) [Member]            
Loss Contingencies [Line Items]            
Business Combination, Consideration Transferred $ 4,600,000,000