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CONTINGENCIES AND COMMITMENTS (Detail) - USD ($) | Oct. 10, 2013 | Sep. 30, 2017 | Mar. 29, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Standby Letters Of Credit [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Letters of credit, outstanding |  | $ 23,400,000 |  | $ 47,200,000
FinancialStandbyLetterOfCreditMember |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Letters of credit, outstanding |  | 13,900,000 |  | $ 12,800,000
Failure to Meet Contractual Obligations [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Damages sought | $ 25,000,000 |  |  |
Surety Bond [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Surety Bond Outstanding |  | 56,000,000 |  |
Damage from Fire, Explosion or Other Hazard [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated Litigation Liability |  | 1,000,000,000 |  |
Minimum [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Range of possible loss |  | 0 |  |
Maximum [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Range of possible loss |  | 55,500,000 |  |
Westinghouse Electric Company (WEC) [Member] | Pending Litigation [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 |  | 0 |  |
AP1000 US [Member] | Maximum [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Range of possible loss |  | $ 31,000,000 |  |
Westinghouse Electric Company (WEC) [Member] | Collectibility of Receivables [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Range of possible loss |  |  | $ 6,500,000 |

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