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CONTINGENCIES AND COMMITMENTS (Schedule of Loss Accrual) (Details) - Butte Fire - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loss Contingency Accrual [Roll Forward]      
Loss accrual, beginning balance $ 561,000,000 $ 690,000,000 $ 0
Accrued losses 0 350,000,000 750,000,000
Payments (118,000,000) (479,000,000) (60,000,000)
Loss accrual, ending balance 443,000,000 $ 561,000,000 $ 690,000,000
Settlement agreements entered 734,000,000    
Settlement agreement paid $ 657,000,000