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CONTINGENCIES AND COMMITMENTS (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 04, 2018 | Oct. 31, 2017 | Dec. 31, 2017 | Mar. 29, 2017 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |  |  |
Asset Retirement Obligation |  |  | $ 7,400,000 |  |
Surety Bond Outstanding |  |  | 56,000,000 |  |
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 |  |  | 21,300,000 |  | $ 47,200,000
Financial Standby Letter of Credit [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Letters of credit |  |  | 14,600,000 |  | $ 12,800,000
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] | Collectibility of Receivables [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss Contingency, Range of Possible Loss, Minimum |  |  |  | $ 4,900,000 |
Westinghouse Electric Company (WEC) [Member] | Subsequent Event [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Business Combination, Consideration Transferred | $ 4,600,000,000 |  |  |  |

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