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CONTINGENCIES AND COMMITMENTS (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jan. 04, 2018
Oct. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 29, 2017
Loss Contingencies [Line Items]          
Asset Retirement Obligation     $ 7,200,000    
Surety Bond Outstanding     45,600,000    
Loss Contingency, Damages Sought, Value     1,000,000,000    
Loss Contingency, Actions Taken by Plaintiff   $ 400,000,000      
Standby letters of credit          
Loss Contingencies [Line Items]          
Letters of credit     21,700,000 $ 21,300,000  
Financial Standby Letter of Credit [Member]          
Loss Contingencies [Line Items]          
Letters of credit     11,700,000 $ 14,600,000  
Failure to Meet Contractual Obligations [Member]          
Loss Contingencies [Line Items]          
Loss Contingency, Damages Sought, Value     25,000,000    
Minimum [Member] | Failure to Meet Contractual Obligations [Member]          
Loss Contingencies [Line Items]          
Loss Contingency, Range of Possible Loss, Minimum     0    
Maximum [Member] | Failure to Meet Contractual Obligations [Member]          
Loss Contingencies [Line Items]          
Loss Contingency, Range of Possible Loss, Minimum     55,500,000    
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]          
Loss Contingency, Range of Possible Loss, Minimum     0    
AP1000 US [Member] | Maximum [Member]          
Loss Contingencies [Line Items]          
Loss Contingency, Range of Possible Loss, Minimum     $ 31,000,000    
Westinghouse Electric Company (WEC) [Member]          
Loss Contingencies [Line Items]          
Business Combination, Consideration Transferred $ 4,600,000,000